Supplements · Organic acids

Malic Acid: Benefits for Energy, Dry Mouth & Skin, Plus Foods

What malic acid is, how it works in your cells' energy cycle, what the research shows for dry mouth, iron, muscle pain and skin, the foods that carry it and how to use it well.

By Dr. Josh Axe, DC, DNM, CNS·21-min read

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Evidence-based39 sources citedUpdated November 7, 2026

Published Nov 7, 2026Last updated Nov 7, 2026Editorial policyMedical review policyFact-checking policy

Apples, plums and peaches all carry malic acid, which makes up as much as 90% of the organic acids in cultivated apples.

The Dr. Axe Score™

6.4/10

Overall Dr. Axe Score · Malic Acid

Malic acid scores 6.4 for its placebo-controlled results against dry mouth, its everyday role in your cells' energy cycle and a safety profile that starts with being part of fruit.

Scientific Evidence

4.8/10

Seven placebo-controlled trials and a meta-analysis for a 1% mouth spray, trials with magnesium for fibromyalgia, a single-meal iron study and deep research on its place in cell energy.

Bioavailability & Absorption

6.6/10

A natural fruit acid your cells also make; 1,200 mg a day by mouth raised urine citrate and pH within a week in 8 healthy people.

Clinical Effectiveness

6.4/10

Our judgment: the mouth spray eased dry mouth and raised saliva, a gram with a meal doubled the iron absorbed from it, the fibromyalgia results are mixed, and Dr. Axe recommends magnesium malate for low energy and sore muscles.

Safety & Tolerability

8.4/10

Part of everyday fruit and affirmed as safe as a food ingredient; sour candy can wear tooth enamel, and strong skin products can irritate and raise sun sensitivity.

Why this score?

Why Malic Acid scores 6.4 / 10

Weighting: Evidence 30% · Bioavailability & Absorption 25% · Clinical Effectiveness 25% · Safety & Tolerability 20% (4.8×0.30 + 6.6×0.25 + 6.4×0.25 + 8.4×0.20 = 1.44 + 1.65 + 1.60 + 1.68 = 6.37, shown as 6.4). How we score

A transparent, weighted index built for supplements. See how it’s calculated →

Interaction check: Low. No drug interactions are documented for malic acid itself. Magnesium malate follows magnesium's own spacing rules: take a tetracycline or quinolone antibiotic, such as ciprofloxacin, at least 2 hours before or 4 to 6 hours after it, and keep it at least 2 hours away from an oral bisphosphonate for bone loss, such as alendronate.34 Interactions are rated separately and don't change the score.

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Malic acid at a glance

Malic acid is the natural acid that makes apples tart, and your cells make the same molecule as one of the steps that turn food into energy.1 2 A medium apple carries roughly a gram of it, and in placebo-controlled trials, a 1% malic acid mouth spray eased dry mouth and raised saliva better than placebo within 2 weeks.1 3 4 5

What it does for you: inside your cells, malate is a working step in the cycle that makes energy; in your mouth, its sour taste calls up saliva; with a meal, it doubled the iron absorbed in a single-meal study2 6 7
Dr. Axe's pick: real food first, and magnesium malate for low energy, sore muscles and recovery8
How much: fruit every day; studies used 1,200 to 2,400 mg a day with magnesium, or 1 gram with a meal9 7
How to use it: eat it in apples, plums and peaches, take it as magnesium malate, or use a 1% spray for a dry mouth7 8 4

Malic acid is the natural acid that gives apples their tart bite, and your body makes the same molecule inside your cells, where it's one of the steps that turn the food you eat into energy.1 2 My big message to my patients has long been to eat real food, and fruit is the everyday way to get malic acid. When you want more help with energy and sore muscles, magnesium malate, which is magnesium bound to malic acid, is the form I recommend.8

Bite into a tart apple and much of the sourness you taste is malic acid, which makes up as much as 90% of the organic acids in cultivated apples.1 Food makers add it to sour candy, drinks and jams for that same tartness, skin-care products use it as an exfoliating fruit acid, and in a 1% mouth spray it has helped people with a dry mouth make more saliva.10 11 4

If you feel always tired or your muscles stay sore, your body isn't broken. It's sending you a message you shouldn't ignore, and the root cause of fatigue can include dozens of things, not just one. Many of those things come down to poor cellular health, and cellular and mitochondrial dysfunction is the single greatest factor in people having low energy today.12 Your mitochondria are the tiny powerhouses that turn food into usable energy, and that's exactly where malic acid does its everyday work.2

If your goal is cellular function, less muscle soreness and improving low energy, magnesium malate is probably your best option.Dr. Josh Axe, DC, DNM, CNSFrom The #1 Mineral for Sleep That 48% of People Lack, The Dr. Josh Axe Show (2026), at 18:09

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Did you know?

Wild apples carry more than twice the malic acid of the apples we grow. In a study of 101 kinds of apple, wild fruit averaged 11.59 mg per gram, against 5.26 mg for cultivated varieties.1
The malic acid in fruit is the L-form. DL-malic acid, made commercially from fumaric or maleic acid, doesn't occur in nature.10
Hard candy can carry up to 6.9% malic acid, the highest maximum level the FDA lists for any food category, which helps explain why sour hard candy tastes so sharp.10

What is malic acid?

Quick answer

Malic acid is a natural organic acid (C4H6O5) that gives apples and other fruit their tartness, and your cells make it too, as malate, in the cycle that produces energy.10 1 13 The form in fruit is L-malic acid; DL-malic acid is a mix made commercially from fumaric or maleic acid, and it doesn't occur in nature.10

Chemists group malic acid with the alpha hydroxy acids, or AHAs, the family of fruit acids that also includes glycolic, lactic, tartaric and citric acid, which is why you'll find it in skin care as well as in food.11 Inside your body it goes by malate, the form the molecule takes in your cells' energy cycle, and that's also the name it carries in supplements where it's bound to a mineral or an amino acid, such as magnesium malate and citrulline malate.2 8 14

In food, malic acid adds tartness, rounds out flavor and holds acidity steady.10 You'll meet it in a handful of forms:

Fruit

Apples, plums and peaches carry L-malic acid naturally.1 7

Malic acid powder

A tart powder you dissolve in water. L-malic acid is the form found in fruit.10

Magnesium malate

Magnesium bound to malic acid.8

Dry-mouth spray

A 1% malic acid spray that also contains xylitol and fluoride, the form tested for dry mouth.4

Skin care

An alpha hydroxy acid used in peels and exfoliating products.11

Creatine and citrulline malate

Malate bound to creatine or citrulline, studied for exercise performance.15 14

A short history of malic acid

Malic acid's move from the orchard into food and medicine is fairly recent, and the FDA has listed it among food ingredients affirmed as generally recognized as safe since 1979.10 In 1992, two researchers laid out their reasoning for pairing magnesium with malic acid in fibromyalgia, a condition of widespread muscle pain and fatigue, and both went on to help run the larger trial described below.16 9 From 2013 to 2024, a 1% malic acid mouth spray was tested in seven placebo-controlled trials in people whose medicines or illnesses had left their mouths dry.4 17

What is malic acid good for?

Quick answer

Malic acid's best-supported use is for dry mouth: in seven placebo-controlled trials, a 1% malic acid spray eased symptoms and raised saliva within 2 weeks, and pooling five of them, it beat placebo on every dry-mouth score and on saliva flow.4 5 With magnesium, it has been studied for fibromyalgia pain, it helped iron absorb from a meal, and creatine malate and citrulline malate, two supplements that pair malate with another compound, have improved exercise performance.9 7 15 14

Malic acid benefits, graded by evidence (updated October 2026). Labels are editorial judgments that compare malic acid's uses with each other; they aren't formal certainty ratings.
Use	Evidence	What was studied	What the research shows
Dry mouth	Moderate	A 1% malic acid spray with xylitol and fluoride, used as needed for 2 weeks	92% felt some relief vs. 15% on placebo in 45 adults on blood-pressure medicines; better than placebo on each pooled dry-mouth score in the meta-analysis4 5
Iron absorption	Emerging	1 gram of L-malic acid added to a rice meal	Iron absorbed rose from 4.8% to 9.5%7
Fibromyalgia pain	Mixed	Malic acid with magnesium, 4 weeks at a low dose, then up to 6 months at a higher dose	No difference from placebo at the low dose; significant relief of pain and tenderness at the higher dose9
Exercise performance	Emerging	Creatine malate; citrulline malate	More power in sprinters and distance in runners; more repetitions in strength training15 14
Skin renewal	Emerging	Alpha hydroxy acids, the family that includes malic acid	Used as superficial peels and for rough patches and acne11
Urine chemistry	Emerging	1,200 mg a day for 7 days	Urine citrate and pH rose18

How malic acid works in your body

Inside your cells, small structures called mitochondria turn the food you eat into ATP, the energy your cells run on, and malate is part of that work around the clock.13 2 Scientists call that work the Krebs cycle, or the citric acid cycle, and you can picture it as a wheel turning inside each mitochondrion: each turn strips energy-rich electrons from the fuel your food provides and hands them to the chain that makes ATP, with malate as one of its spokes.13 2

Because your cells make their energy in that cycle, fatigue can lead back to the cell. I teach healing at the cellular level in three steps, cleanse, rebuild and energize, and the last step means energizing your mitochondria so you have the power to heal yourself and regenerate.19 Magnesium malate is bound to malic acid, which plays a role in energy production, and that's why it's the magnesium I recommend when energy is the goal.8

1From fruit, and from your own cells

Apples carry L-malic acid, about 5 mg in every gram of fruit in cultivated varieties, and your cells make the same molecule as part of their energy cycle.1 10 2

2A step in the Krebs cycle

Inside your mitochondria, fumarate becomes malate as the cycle turns.2

3Malate loads an energy carrier

An enzyme turns malate into oxaloacetate, and that step hands off NADH, a carrier loaded with energy-rich electrons.2

4The energy chain makes ATP

NADH from the cycle feeds the electron transport chain, which makes ATP, the fuel your cells run on.2

5Malate ferries electrons inward

In tissues such as your liver and heart, the malate-aspartate shuttle uses malate to carry energy-rich electrons from the body of the cell into the mitochondria.20

Malic acid benefits, ranked by evidence

Malic acid's benefits start with relief for a dry mouth, then better iron absorption from plant foods, support for muscle pain and fibromyalgia, exercise and recovery and smoother skin, ranked by how much human research backs each one.

Relief for dry mouth

Moderate evidenceHuman study7 placebo-controlled trials, 28 to 70 people each · meta-analysis of 5 trials, 244 people

A dry mouth can make talking, chewing and sleeping uncomfortable, and medicines for blood pressure and depression are among its causes.4 21 Malic acid's sour taste calls up saliva, and a 1% malic acid spray, which also contains xylitol and fluoride, has been tested against an identical spray without the malic acid.6 4

In a randomized trial of 45 adults with dry mouth from blood-pressure medicines, in which neither the people nor the researchers knew who got what, 92% of those using the malic acid spray felt some relief after 2 weeks, against 15% on the placebo spray (25 people on malic acid, 20 on placebo). Resting saliva rose from 0.17 to 0.242 mL a minute with malic acid and barely moved on placebo, and the malic acid group needed their spray about half as often, 3.71 times a day against 6.75.4

It has helped across very different causes of dry mouth: in placebo-controlled trials, the same spray raised saliva and eased symptoms in 70 adults on antidepressants, 41 older adults averaging 79 years old, 52 adults with type 2 diabetes and 28 people with graft-versus-host disease after a transplant.21 22 17 23 In 60 people who finished another trial, both sprays eased dryness, but quality of life improved only with malic acid, and in a three-way trial of 51 adults it worked as well as a saliva-substitute mouthwash, with both improving quality of life where placebo didn't.24 25 Pooling 5 of these trials with 244 people, a meta-analysis found the spray better than placebo on each of the dry-mouth scores it pooled and on resting and stimulated saliva, though its authors noted the trials were limited.5

For Sjögren's syndrome, an autoimmune condition that dries the mouth and eyes, a malic acid lozenge eased dryness, improved quality of life and raised saliva in 110 people who each tried both it and a citric acid mouthwash, with a larger effect and significantly more saliva than the mouthwash.26 In 80 people with the condition, a malic acid stimulant with fluoride and xylitol raised saliva as well as a traditional citric acid stimulant, and saliva dropped into the strongly acidic range, below pH 4.5, far less often.6

Study takeaway: a 1% malic acid spray used as needed eased dry mouth and raised saliva within 2 weeks.

Dry mouth eased for 92% of people using a malic acid spray

Source: Gómez-Moreno et al. · Medicina Oral, Patología Oral y Cirugía Bucal, 2013 [4]Share of people in each group who reported some recovery from dry mouth after 2 weeks of using the spray as needed.

Better iron absorption from plant foods

Emerging evidenceHuman studySingle-meal absorption study · 8 women

If much of your iron comes from plants, the acids in fruit and vegetables help you take more of it in. In a single-meal study, 8 women ate a rice meal carrying 3 mg of iron, and adding 1 gram of L-malic acid raised the share of iron they absorbed from 4.8% to 9.5%, about double.7

Across the vegetables the same researchers tested, the ones whose iron absorbed best carried appreciable amounts of malic acid, citric acid or vitamin C, and in pumpkin, malic acid looked like the main helper.7 So when you build a meal around beans, lentils or greens, put tart fruit or vegetables such as tomatoes and broccoli on the same plate. Our list of iron-rich foods has more ideas, and if you want to know where your stores stand, a ferritin test will tell you; the optimal range is 50 to 150 ng/mL for women and 75 to 150 for men.

Study takeaway: a gram of malic acid with a meal doubled the iron absorbed from it.

A gram of malic acid doubled the iron absorbed from a rice meal

Source: Gillooly et al. · British Journal of Nutrition, 1983 [7]Average iron absorption from the same meal with and without 1 gram of L-malic acid, adjusted to a standard reference.

Muscle pain and fibromyalgia support

Mixed evidenceHuman studyTrial of 24 adults, placebo-controlled at the lower dose, then people knew what they took · an earlier trial of 15

Paired with magnesium, malic acid has eased the widespread pain of fibromyalgia: in a trial of 24 adults, pain and tenderness fell once the amount was raised and taken for 6 months, with people knowing what they were taking, and tender points improved in an earlier 8-week trial of 15 people who also knew what they took.9 16 27 The magnesium section below gives the doses and the trial's lower-dose phase, which matched placebo over 4 weeks.

Study takeaway: with magnesium, the higher amounts eased fibromyalgia pain and tenderness over 6 months.

Exercise and recovery support

Emerging evidenceHuman studyPlacebo-controlled trials of creatine malate and citrulline malate · 2 meta-analyses

For sore muscles and recovery, magnesium malate is the form I recommend, and the magnesium section below covers why.8 Two other malate supplements can help you train harder: creatine malate, a form of creatine bound to malate, improved power in sprinters and distance in long-distance runners in a 6-week placebo-controlled trial, and citrulline malate added repetitions in strength training across 8 placebo-controlled studies.15 14

Study takeaway: creatine malate and citrulline malate improved power, endurance and strength-training repetitions.

Smoother skin

Emerging evidenceIn vitro (lab)Review of alpha hydroxy acids, mostly lab and animal work · a skin tolerance study in volunteers

As an alpha hydroxy acid, malic acid helps loosen the dull, dead layer on your skin's surface. AHAs, malic acid among them, are used in dermatology as superficial peels and to improve the look of rough, scaly patches and acne, and how strongly they work depends on their concentration.11 In healthy volunteers, malic acid applied on its own twice a day for 4 days didn't set off a significant irritant reaction.28 Most of that research looks at the AHA family as a whole, and malic acid is used the same way, in a skin-care routine or a mild chemical peel.

Study takeaway: an alpha hydroxy acid used to renew the skin's surface.

Malic acid with magnesium for energy, fibromyalgia and recovery

Quick answer

Magnesium malate is magnesium bound to malic acid, and Dr. Axe recommends it for cellular energy, sore muscles and recovery.8 In a trial of 24 adults with fibromyalgia, up to 2,400 mg of malic acid and 600 mg of magnesium a day eased pain and tenderness over 6 months, when people knew what they were taking; a lower dose had matched placebo over 4 weeks.9 27

Magnesium malate brings together magnesium and malate, one of the spokes of your cells' energy cycle. If you live with chronic fatigue or fibromyalgia, magnesium malate could be a good source of magnesium because of how it supports energy production and helps reduce muscle soreness, though it may not be as effective at promoting relaxation and sleep as other forms like glycinate.29 Of all the types of magnesium, the one I take most myself and recommend most to my patients is a food-based magnesium, and I also recommend magnesium glycinate a lot for people having trouble sleeping or dealing with anxiety.8 So match the form to your goal, and when the goal is energy and recovery, reach for malate.

What the fibromyalgia trials found

Fibromyalgia brings widespread muscle pain, tender points and deep fatigue, and two trials have tested malic acid with magnesium in people living with it.27 In the main trial, 24 adults with fibromyalgia were assigned to take tablets of malic acid with magnesium and a placebo, each for 4 weeks, so each person tried both, and 20 finished that phase.9 27 At 1,200 mg of malic acid and 300 mg of magnesium a day, pain and tender points came out about the same as on placebo. The researchers then raised the amount to as much as 2,400 mg of malic acid and 600 mg of magnesium a day for 6 months, with people knowing which treatment they got, and the severity of all three main pain and tenderness measures fell significantly.9 27

Because the tablets combined the two, the trials can't say how much of the relief came from the magnesium and how much from the malic acid.30 An earlier 8-week trial by two of the same researchers, in 15 people with fibromyalgia who knew which treatment they got, used the same range of doses and found the tender-point score improved significantly.16 27

For athletes and sore muscles

If you're an athlete and you've got muscle soreness and want to improve recovery, take magnesium malate; it's a really good option there.8 When I had a snow ski trip coming up and knew my legs were going to get really fatigued, I figured I might bring magnesium Epsom salts to soak in at night, or take magnesium malate for cellular energy and recovery.8

Malate bound to other compounds has its own exercise research, and both creatine malate and citrulline malate have helped athletes. In a placebo-controlled trial of sprinters and long-distance runners training for 6 weeks, creatine malate brought larger gains in peak power and total work in the sprinters, along with a rise in growth hormone, and a longer distance covered in the runners' endurance test, though their peak oxygen use didn't change.15 With citrulline malate, 6 to 8 grams taken 40 to 60 minutes before strength training added a small but significant number of repetitions to failure across 8 placebo-controlled studies with 137 people, and a 2026 analysis of 30 trials with 644 people found a small overall improvement in exercise performance.14 31 For more ways to bounce back after a hard session, see our guide to muscle recovery.

Which foods have malic acid?

Quick answer

Apples are the classic source: cultivated apples average about 5.26 mg of malic acid per gram, so a medium apple carries roughly a gram, depending on the variety.1 3 Plums and peaches carry from 3 to more than 10 grams per kilogram, and many vegetables carry it alongside citric acid and vitamin C.7

In the apples we grow, malic acid is the main acid behind their tartness, so the tarter the variety, the more it tends to carry.1 In a study of 101 kinds of apple, cultivated varieties ranged from 1.72 to 10.10 mg per gram of fruit, so one variety can carry several times as much as another.1 At the average of 5.26 mg per gram, a medium apple of about 182 grams works out to roughly 0.96 grams of malic acid.1 3 Fall is apple season, which makes this the easiest time of year to keep a bowl of them on the counter.

Plums and peaches carry it in amounts from 3 grams to more than 10 grams per kilogram.7 Among vegetables, pumpkin, cauliflower, cabbage, turnips, beets and sauerkraut, along with broccoli and tomatoes, all carried appreciable amounts of malic acid, citric acid or vitamin C in the iron research above.7 Eating a mix of whole fruit and vegetables every day gives you malic acid the way it comes in nature, alongside the fiber, water and other nutrients of the plant.

How to use malic acid

The simplest way to use malic acid is to eat it, and the other forms each have a specific job.

Fruit first. Make an apple, a plum or a peach your everyday source of malic acid.1 7

Pair it with plant iron. Put tomatoes, broccoli or cauliflower on the same plate as beans, lentils or greens to help that iron absorb.7

Green apples and sour foods for your bile. I recommend green apples, which are high in malic acid, and sour foods such as a little lemon juice in water or apple cider vinegar for your liver, gallbladder and bile.32 33

For a dry mouth. A 1% malic acid spray with xylitol and fluoride, used as needed up to 8 times a day for 2 weeks, is the form the trials tested.4

As magnesium malate. For low energy, sore muscles and recovery, magnesium malate is the form Dr. Axe recommends.8

On your skin. Choose a low-strength AHA product with malic acid and build up slowly, since the effect depends on concentration; the safety section covers sun care.11

Malic acid as a food ingredient

Food makers use malic acid as a flavor enhancer, a flavoring and a pH control agent, and the FDA affirms it as generally recognized as safe in food, except baby food.10 The maximum levels it lists, as served, run from 0.7% in most foods to 2.6% in jams and jellies, 3.0% in chewing gum and soft candy, 3.4% in drinks and 3.5% in processed fruits and juices, with hard candy highest of all.10 Most of your malic acid can come from fruit, and the candy aisle is where the added kind is most concentrated.

How to choose a malic acid supplement

L-malic acid on the label, the form found in fruit and made in your body.10
A powder you dissolve fully in water before you use it.
Bovine or fish gelatin, or a plant-based capsule shell, and no added sugar.

Want help fitting malic acid into your plan?

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How much malic acid should you take?

Quick answer

Fruit every day is the simplest amount: a medium apple carries roughly a gram of malic acid and your cells make their own, so you don't need a supplement to have it, and there's no established daily dose.13 1 3 In studies, people used 1,200 to 2,400 mg a day with 300 to 600 mg of magnesium for fibromyalgia, 1 gram with a meal for iron absorption and a 1% spray as needed for dry mouth.9 7 4

Along with the fibromyalgia amounts above, these are the amounts researchers used for each goal:

Dry mouth: a 1% malic acid spray, used as needed up to 8 times a day for 2 weeks.4
Iron absorption: 1 gram of L-malic acid with the meal.7
Urine chemistry: 1,200 mg a day for 7 days.18
Strength training, as citrulline malate: 6 to 8 grams, 40 to 60 minutes before the workout.14

Take malic acid with food when the goal is iron from that meal, and spread spray use through the day as your mouth needs it.

Malic acid side effects and safety

Quick answer

Malic acid is a normal part of fruit and is affirmed as safe as a food ingredient, and its side effects come mainly from concentrated forms: sour candy on your teeth and strong skin products on your skin.10 35 36

Good to know before you use malic acid:

Teeth: In lab tests, sour novelty candies had a pH of 1.8 to 3.2 and wore away tooth enamel, and sour versions of candies were more erosive than the originals.35 37 Keep sour candy to an occasional treat with a meal, and rinse with water afterward.
Skin products: AHAs can cause swelling, burning and itching, and they can make your skin more sensitive to the sun.11 36 Start with a low-strength product, and use sunscreen, cover up and limit sun while you use it and for a week afterward.36
The pure powder: Malic acid irritates skin and strongly irritates eyes in concentrated form.38 Dissolve the powder fully in water, and keep it away from your eyes.
Allergy: Reactions are rare, but hives and delayed skin reactions have been reported.38 Stop at any rash or hives.
Pregnancy and breastfeeding: Fruit is fine, but malic acid supplements haven't been studied at these times, so stick to food amounts.
Magnesium malate and your kidneys: Kidneys that don't work well can't clear extra magnesium, so with kidney disease, check with your practitioner before taking any magnesium supplement.34 The adult upper limit for supplemental magnesium is 350 mg a day of elemental magnesium, the amount the label lists for magnesium, and going above it can loosen stools; the higher-dose fibromyalgia phase used 600 mg, above that limit, so the trial amount isn't a starting dose.34 9

The bottom line

Should you get more malic acid?

Yes, and the best place to start is your fruit bowl. Malic acid is the tart, natural acid in apples, plums and peaches, and inside your cells it's one of the working steps of the cycle that turns food into energy. In people, a 1% malic acid spray beat placebo for dry mouth and saliva when five of its seven placebo-controlled trials were pooled, a gram with a meal doubled the iron absorbed from it, and with magnesium, the higher doses eased fibromyalgia pain over 6 months. Creatine malate and citrulline malate have helped athletes too.

Eat whole fruit every day, put tart fruit and vegetables on the plate with your plant sources of iron, and when you want help with energy, sore muscles or recovery, choose magnesium malate. If your mouth is dry, a 1% spray is the form with the trials behind it. Fill that bowl this apple season, and give your cells more of something they already know how to use. Your body was designed to heal, and it has an incredible capacity to do it when you start doing the right things.19

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Malic acid: frequently asked questions

What is malic acid good for?

Malic acid is best supported for dry mouth: in seven placebo-controlled trials, a 1% malic acid spray eased symptoms and raised saliva within 2 weeks, and pooling five of them, it beat placebo on every dry-mouth score and on saliva flow.4 5 In a randomized, placebo-controlled trial of 45 adults on blood-pressure medicines, 92% felt some relief against 15% on placebo.4 It also doubled the iron absorbed from a meal in a single-meal study of 8 women, and with magnesium it eased fibromyalgia pain at higher doses in a trial of 24 adults.7 9

Is malic acid natural?

Yes. L-malic acid occurs naturally in fruit such as apples, and your cells make it as malate in the cycle that produces energy.10 13 The DL-form is made commercially from fumaric or maleic acid and doesn't occur in nature.10

What's the difference between L-malic acid and DL-malic acid?

L-malic acid is the form in fruit and in your body, while DL-malic acid is a factory-made mix of the L-form and its mirror image, made from fumaric or maleic acid.10 If you buy a powder, look for L-malic acid, the naturally occurring form.

What foods are high in malic acid?

Apples are the classic source, averaging about 5.26 mg per gram in cultivated varieties, roughly a gram in a medium apple.1 3 Plums and peaches carry 3 to more than 10 grams per kilogram, and pumpkin, broccoli, cauliflower and tomatoes carry malic acid, citric acid or vitamin C.7

Malic acid vs. citric acid: what's the difference?

Both are natural fruit acids, and both are steps in your cells' energy cycle, which is also called the citric acid cycle.13 Malic acid is the main acid in apples, up to 90% of the organic acids in cultivated varieties, and in a randomized trial of 80 people with Sjögren's syndrome, a malic acid saliva stimulant kept saliva out of the strongly acidic range far more often than a traditional citric acid stimulant.1 6

Does malic acid help with fibromyalgia?

With magnesium, it may: in a trial of 24 adults with fibromyalgia, up to 2,400 mg of malic acid and 600 mg of magnesium a day for 6 months significantly eased pain and tenderness when people knew what they were taking, though 1,200 mg with 300 mg of magnesium matched placebo over 4 weeks.9 27 Dr. Axe says magnesium malate could be a good source of magnesium for people with chronic fatigue or fibromyalgia, because of how it supports energy production and helps reduce muscle soreness.29

Does malic acid give you energy?

It's part of how your cells make energy: inside your mitochondria, malate is a step in the Krebs cycle, which loads the carrier NADH for the chain that makes ATP.2 Dr. Axe recommends it as magnesium malate for low energy, sore muscles and recovery.8

Does malic acid help dry mouth?

Yes. In seven placebo-controlled trials, a 1% malic acid spray with xylitol and fluoride, used as needed for 2 weeks, eased dry mouth and raised saliva, and a meta-analysis of 5 of those trials with 244 people found it better than placebo on each of the dry-mouth scores it pooled.5 In a randomized, placebo-controlled trial of 45 adults on blood-pressure medicines, 92% felt some relief against 15% on placebo.4

Is malic acid good for your skin?

Yes, as an alpha hydroxy acid: AHAs, malic acid among them, are used as superficial peels and to improve the look of rough, scaly patches and acne, according to a review of mostly lab and animal research.11 Start with a low-strength product, and see the safety section for sun care.

Is malic acid good for your liver and gallbladder?

It can support both through food: Dr. Axe teaches that sour foods, such as a little lemon juice in water or apple cider vinegar, are very supportive for the liver, gallbladder and bile, and he recommends green apples, which are high in malic acid, to soften bile and support gallbladder function.33 32 Inside your liver cells, malate also does everyday work, carrying energy-rich electrons into the mitochondria through the malate-aspartate shuttle.20 For gallstones or a fuller plan, see our gallbladder diet and bile salts guides.

Can malic acid help prevent kidney stones?

It may help the chemistry of your urine: in a small study of 8 healthy people with no comparison group, 1,200 mg of malic acid a day for 7 days significantly raised urine citrate, which helps keep calcium from forming stones, and urine pH.18 Calcium oxalate saturation fell, though not significantly, and calcium phosphate saturation rose, and the researchers concluded that malic acid may be useful in a conservative approach to calcium kidney stones.18

Does malic acid raise blood sugar?

Not in the research so far: malic acid is an organic acid, not a sugar, and in a placebo-controlled trial of 22 healthy adults who each tried both, run with researchers from a drug company's nutrition institute, a drink with 400 mg each of GABA and malic acid before a meal raised glucagon-like peptide-1 (GLP-1), a gut hormone that helps manage blood sugar, more than a citric acid drink did, without changing blood sugar or insulin.39

Is malic acid bad for you?

No, not in food amounts: it's a natural part of fruit, and the FDA affirms it as generally recognized as safe as a food ingredient.10 Its side effects come from concentrated forms, mainly sour candy on your teeth and strong AHA products on your skin, and the safety section covers both.

Is malic acid vegan?

Yes. Malic acid occurs naturally in fruit, and the commercial DL-form is made from fumaric or maleic acid, not from animals.10 In capsules, check that the shell is plant-based if you avoid all animal products.

Freshness & update log

November 7, 2026 — Rewrote the page in full and moved the byline to Dr. Josh Axe. The previous version cited a dietary survey for the iron point and a general saliva review for oral bacteria, linked a pomegranate trial for blood sugar whose own results found the malic and citric acid solution ineffective, warned against malic acid for low blood pressure without a human study, and listed side effects without sources. This version explains what malic acid is and how it works in your cells' energy cycle, ranks its benefits by human evidence with each study's design and size, adds the dry-mouth spray trials and the iron absorption study with their numbers, reports the fibromyalgia trial at both doses, adds a Dr. Axe Score (6.4) with an interaction check, two charts and a step diagram, apple and fruit sources from measured data, FDA's food-ingredient listing, and a safety section from sourced cautions, with 39 references.

January 30, 2023 — Previous version last updated.

References

Dr. Josh Axe, DC, DNM, CNS

Doctor of Natural Medicine · Founder, DrAxe.com

Dr. Axe is a certified doctor of natural medicine, clinical nutritionist, and multiple New York Times bestselling author. He has spent 20+ years in clinical practice helping people heal at the root cause and founded one of the most-visited natural-health platforms in the world.

Read the full bio →

This article is for educational purposes. See our medical disclaimer.

On this page

What is it?
What is it good for?
How it works
Benefits, ranked
With magnesium
Food sources
How to use it
How much
Side effects
The bottom line
Should you get more malic acid?
FAQ

Quick facts

What it isA natural fruit acid (C4H6O5), the main acid in apples, and a working step in your cells' energy cycle
Where it's foundApples (roughly 1 gram in a medium apple), plums, peaches and other fruit; added to sour candy, drinks and jams
Best studied forDry mouth (a 1% spray, 7 placebo-controlled trials), iron absorption from a meal, and fibromyalgia pain with magnesium
Dr. Axe's pickReal food first; magnesium malate for cellular energy, sore muscles and recovery
Studied amounts1,200 to 2,400 mg a day with magnesium; 1 gram with a meal; a 1% spray as needed
Interaction checkLow; magnesium malate follows magnesium's spacing rules with some antibiotics and bone drugs

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