Garlic: Benefits, Nutrition, Raw vs. Aged & How Much to Eat

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Garlic is one of the oldest medicines in the kitchen, and it's still the clove you crush into tonight's dinner. Sumerian healers were using it more than 4,000 years ago, and the Israelites remembered it in the wilderness.1213

One small bulb can matter for so much at once because garlic works on the systems that sit behind so many chronic problems. It's a sulfur food, so when you crush a clove, its sulfur compounds go to work, helping your blood vessels relax and priming the immune cells that respond first to infection.23 Garlic's fiber, meanwhile, feeds the gut bacteria that keep inflammation and invaders in check.4 That's food as medicine at its most practical, at about 4.5 calories a clove.14

Other than rare situations, every person should eat garlic, as I wrote in The Biblio Diet: about 2 to 5 grams, or one medium clove, a day.9 Let's look at what garlic does in your body, what the trials show, and how to get the most from every clove, whether you eat it raw, cooked or as an aged extract.

Did you know?

• Archaeologists have found garlic bulbs in Egyptian pyramids, and garlic went into the tomb of the young pharaoh Tutankhamun.12

• Researchers use the garlic on your breath as a measuring tool. They track allyl methyl sulfide, the main garlic compound you breathe out, for 32 hours after you eat it, and that tells them how much allicin a garlic food or supplement delivers.1

• Garlic earned the nickname "Russian penicillin" because Russian physicians used it for so long to treat respiratory infections.12

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What is garlic?

You may have noticed that a whole clove barely smells until you cut it. That's because garlic's sharp smell and bite come from sulfur compounds that form when a clove is cut or crushed, and those same compounds carry most of its activity in your body.1 Growers sort garlic into two main groups. Hardneck garlic sends up a flower stalk, called a scape, topped with small bulbils, and growers remove it as soon as it shows, while softneck types, such as silverskin garlic, rarely if ever send one up.15

If you'd like to grow your own, garlic is super easy to grow.9 You plant it in the fall, and it's ready to harvest when 40% to 60% of its leaves have yellowed, out of the six a plant generally carries.15 (Black garlic, whole bulbs aged until the cloves turn dark, sweet and soft, has a guide of its own, as do allicin and garlic peels.)

A short history of garlic

From Central Asia, garlic traveled with nearly every great civilization of the ancient world.12 In Egypt, the Ebers papyrus, a medical text from about 1550 BC, lists garlic for heart conditions, parasitic infections and general malaise.16 Egyptians fed garlic to their laborers to keep them strong for hard work, and the Greek historian Herodotus wrote that inscriptions on the pyramids showed how much was spent on garlic for those builders, which made garlic part of the budget for the pyramids.12

Garlic shows up in Scripture, too, when the Israelites in the wilderness looked back on Egypt's table: "We remember the fish, which we did eat in Egypt freely; the cucumbers, and the melons, and the leeks, and the onions, and the garlick" (Numbers 11:5).13 Garlic, onions and leeks make my list of the 10 biblical superfoods, at number nine.17 (Our guide to the top 10 Bible foods that heal sets them beside the rest of the biblical diet.)

The Greeks leaned on it, too: army leaders fed their troops garlic before major battles, and Olympic athletes ate it before they competed.12 Hippocrates named garlic as a remedy for intestinal parasites, a laxative and a diuretic. Dioscorides recommended it for colic and worms, and the Roman writer Pliny the Elder considered it a universal remedy.12 Much later, in 1858, Louis Pasteur wrote that garlic killed bacteria.12

Garlic nutrition facts

Calculated from USDA FoodData Central FDC ID 169230 (Garlic, raw) at the record's clove weight of 3 grams.14

A food this small, with so few calories, does so much because of the chemistry a nutrition label doesn't list: allicin and the sulfur compounds it becomes, plus fructans, a fermentable fiber garlic carries in abundance.14

How garlic works in your body

Garlic does its work through sulfur, and the chain starts on your cutting board. A whole clove is like a glow stick that hasn't been snapped yet, holding a compound called alliin and the enzyme alliinase apart. When you crush, chop or chew it, the two meet to make allicin, the compound behind garlic's bite and much of its activity,1 which is why the way you prepare garlic matters so much. Allicin doesn't last long, though, because it breaks down into a family of other sulfur compounds, including ajoene and vinyldithiins, while aging garlic in liquid builds a different set, led by S-allyl cysteine.1618

From there, those compounds act on three systems at once, starting with your blood vessels. Your red blood cells turn garlic's sulfur compounds into hydrogen sulfide, a signaling gas your body uses to relax arteries, and that works a bit like widening a garden hose so the water pushes less hard against its walls. In lab work with rat aorta, the more hydrogen sulfide a garlic compound released, the more the vessel relaxed.2 I teach that garlic boosts nitric oxide and hydrogen sulfide, which widen blood vessels.11 In your immune system, aged garlic extract helped two kinds of first responders multiply better,3 and in your gut, garlic's fructans, fibers your small intestine doesn't digest, feed the beneficial bacteria.419

Sulfur also feeds your own antioxidant defenses. Garlic and onions are part of the sulfur family, high in cysteine, a building block of glutathione, your body's master antioxidant. One of the steps I teach for supporting it is simple: add sulfur to your meals, with cruciferous vegetables, garlic, onions, eggs and sauerkraut.20

When my mom was battling cancer, I was very conscious of the foods we had her eat constantly alongside her medical care, and garlic and onions were on that list.20 Those same sulfur-rich foods feed your detox enzymes.21 (Our guide to foods high in sulfur has the full list.) You can see the antioxidant side in people, too. In the pooled trials, garlic lowered CRP, a marker of inflammation, by 1.6 mg/L and malondialdehyde, a marker of oxidative damage, by 1.03 nmol/mL, and it raised total antioxidant capacity by 0.46 mmol/L.8

In all of this, garlic is supporting things your body already does on its own: relaxing its vessels, defending itself and keeping its gut in balance. The steps below follow one crushed clove from your cutting board into your body:

Garlic benefits

Garlic helps most with your heart and blood vessels, and from there its benefits reach out to blood sugar, immune defense, your gut and the microbes garlic helps keep in check.

More ways garlic supports your health

Clearing lead. Garlic's sulfur compounds are part of why I count it among the foods that support detox,21 and one trial put that to a real test. In a randomized trial of 117 car-battery workers with chronic lead poisoning, garlic (1,200 µg of allicin three times a day) went head to head with d-penicillamine, a drug that pulls lead from the body. Treatment lasted 4 weeks, and blood lead was rechecked 10 days after it ended. Blood lead fell from 426.32 to 347.34 µg/L on garlic and from 417.47 to 315.76 µg/L on the drug, with no significant difference between them. On garlic, irritability, headaches, reflexes and systolic pressure also improved, which they didn't on the drug, and side effects were more common on the drug.40 (Our guide to heavy metal detox has the full plan.)

Easing ear pain. If your child has ever had an earache, you know how miserable it can be. In Ancient Remedies, garlic mullein oil is the first remedy I list for an ear infection. Put 3 to 7 drops of slightly warm oil in the affected ear, then rest with that ear facing up for 5 to 10 minutes, 2 or 3 times a day.41 In a randomized trial of 103 children aged 6 to 18 with ear pain from an ear infection, olive-oil ear drops made with garlic, mullein, calendula and St. John's wort eased pain as well as anesthetic ear drops over 3 days.42

Aged garlic extract: benefits and how much to take

Aged garlic extract is garlic that's been steeped for months, a little like a very slow tea, and the long soak builds stable, water-soluble compounds, led by S-allyl cysteine. That's the marker researchers use to standardize each capsule, so you know what you're getting: the AGE at Heart and GarGIC trials used 1.2 grams of extract carrying 1.2 mg of it.1826 In the AGE at Heart trial of 88 adults with uncontrolled high blood pressure, that amount lowered systolic pressure 5.0 mmHg more than placebo, and 11.5/6.3 mmHg in the people who responded.18 A 2025 meta-analysis of 19 trials of aged garlic found systolic pressure 2.49 mmHg lower and LDL 4.41 mg/dL lower, with bigger effects in people with heart disease.43

So how much should you take? The blood pressure trial in people whose pressure stayed high, most of them on medication, tested three doses, and the middle one did best. In that dose-finding trial, 480 mg a day lowered systolic pressure, while 240 mg didn't change it significantly and 960 mg reached only a borderline drop at 8 weeks,25 so more wasn't better. These are the amounts the trials used:

Your clove a day is food for nearly everyone, while aged garlic extract is the targeted dose, the one to reach for when blood pressure is your goal.910

Garlic in Chinese medicine and Ayurveda: a warming herb

If you tend to run cold, with digestion that feels sluggish, it's worth knowing how Chinese medicine sees garlic. For more than two millennia, traditional Chinese medicine has valued it to treat respiratory infections, aid digestion and ease fatigue.16 It describes the bulb as acrid and warm, used to fortify the spleen and harmonize the stomach.44 In my Top 50 herb guide, I profile it the same way: warming in nature, pungent in flavor and working on the lungs and digestion. It's best for people who run cold with sluggish digestion, and a classic for clearing infections and parasites.11

That warmth is how I match garlic to the person. Next time you catch a cold, take a look at your tongue, and if it's pale or white and you've got chills and feel cold, warming herbs are what you want. Garlic is one of them, along with cinnamon, cayenne, oregano and horseradish.33 A cold that runs hot needs the opposite, though, because a lot of cayenne or garlic can make certain types of colds and flu worse. So when your body is running hot, with redness, fever, inflammation and irritation, often with a very sore throat, I reach for cooling herbs such as honeysuckle instead.33 For a cold that comes with chills, this is the line I teach:

India's healers prized garlic, too. In Ayurveda, garlic is Rasona, classed as a Rasayana, a rejuvenating herb, and used for heart disease, arthritis and infections. The Charaka Samhita, one of Ayurveda's founding texts, describes it for vata disorders and circulatory ailments.16 Ancient Indian medicine also used it as a tonic for poor appetite, weakness, cough, skin disease, rheumatism and hemorrhoids.12

Egyptian, Greek, Chinese and Ayurvedic healers all relied on garlic for thousands of years, and today the trials on blood pressure, colds and microbes line up with what those traditions taught.

Raw vs. cooked garlic: crush it and wait

The wait matters because alliinase, the enzyme that makes allicin, doesn't survive much heat, so the order is what counts: crush first, give the two time to meet, then add the heat. In rats, as little as 60 seconds in the microwave or 45 minutes in the oven blocked garlic's ability to keep a carcinogen from binding to breast-cell DNA, but letting crushed garlic stand 10 minutes before microwaving prevented the total loss.45 In lab tests of garlic's effect on platelets, the clotting cells in blood, 3 minutes or less of oven heat or boiling left the effect intact, but at 6 minutes, whole cloves lost all of it, while cloves crushed before cooking kept part of it.46 In both studies, crushing first protected some of what the heat would otherwise take.

Pickled garlic came in at about 19% of raw in the same breath study.1 So eat some garlic raw, and cook the rest the smart way:

• Crush, chop or press it. Breaking the clove is what lets alliin and alliinase meet and make allicin.1

• Wait 10 minutes. Let crushed garlic sit before it meets the heat.1145

• Add it near the end. Heat reduces allicin, so stir garlic into soups, sautés and sauces in the last minutes of cooking.11

• Eat some raw. Crushed raw garlic in a dressing, hummus or pesto gives you the most allicin.1

• Eat it with a meal. Raw garlic is easiest on your stomach with food.11

Garlic supplements and pills: which form to choose

Food comes first, and a supplement makes sense when you want the dose a trial tested. Then the form matters, because it changes how much allicin your body gets. In the breath study, researchers compared 13 supplements and 9 garlic foods against crushed raw garlic:1

When you shop, choose a product that names its form and its standardized compound. Take it with meals, and if your tablets are enteric-coated, pair them with a lighter meal rather than a high-protein one.1

How much garlic per day?

How much you need depends on what you want garlic to do, and my amounts change with the job:

In the trials above, aged garlic extract worked at 480 mg to 2.56 grams a day.253 Whatever your amount, spread your garlic across meals, crush it before cooking and keep it coming every day.

How to use garlic

Garlic earns a place in almost any savory dish, and the more often it shows up, the easier your daily clove becomes. Sauté it in extra virgin olive oil or a little ghee, and add it in the last minute of cooking.11

Garlic recipes to try

Every recipe below is built around garlic, so start with a good mince. Peel the clove, crush it under the flat side of a chef's knife and chop it roughly, then rock the blade back and forth over it until it's fine. (A garlic press does the job too.) If you mince it before you prep everything else, it gets its 10-minute rest while you work.

Roasted garlic. Slice the top off a whole head so the cloves show, drizzle it with extra virgin olive oil and wrap it in foil. Roast it at 400°F for about 30 minutes, until the cloves are brown and tender. Then squeeze the soft, mellow cloves onto roasted vegetables or toast, or whisk them into sauces.

• Roasted garlic sweet potato soup. Baked sweet potatoes blended with onion, garlic and coconut oil, then simmered in vegetable broth.

• Hot heart health juice. A raw clove of garlic juiced with beet, carrots, cucumber, lemon, ginger and a sliver of jalapeño.

• Garlic lemon chicken. Roasted garlic and lemon spread under the skin of bone-in chicken breasts, then baked.

• Vegan basil pesto. Basil, spinach, sun-dried tomatoes, pine nuts, lemon and three raw cloves, blended with olive oil.

• Garlic aioli. Raw garlic, basil, egg yolks and lemon blended with olive and avocado oils, for dipping vegetables or topping fish.

• Mashed faux-tatoes. Cauliflower blended smooth with roasted garlic and chives, a lighter take on garlic mashed potatoes.

• Zucchini noodles with marinara sauce. A raw sauce of tomatoes, red pepper, basil, oregano and crushed garlic over spiralized zucchini, in place of pasta.

• Garlic bread. Rub a cut clove over toasted whole-grain sourdough bread or sprouted bread and drizzle it with olive oil, or make our gluten-free naan bread, made with almond flour and coconut milk and seasoned with garlic powder.

• Garlic oil for drizzling. Warm crushed garlic in olive oil or a little ghee over low heat, then spoon it right away over vegetables, fish or eggs.

Garlic side effects and how to enjoy it safely

Garlic has been an everyday food for thousands of years, and most of its side effects come from eating a lot of it raw.

Before surgery. Stop garlic supplements and large amounts of raw garlic 7 days before surgery, the timing in my herb guide.1150 The worry is bleeding: a single documented case linked a serious spinal bleed to eating very large amounts of garlic.51 Everyday amounts look different: in a study in which 18 healthy volunteers each tried both, a tzatziki made with 4.2 grams of raw garlic didn't impair platelet function, and neither did that amount eaten daily for a week by five of them.52

Heartburn, gas and bloating. These come mostly from a lot of raw garlic.11 In one aged-extract trial, nearly a quarter of people noticed minor complaints such as bloating, gas or reflux in the first week.25 I've said it plainly: eating raw garlic all the time when your digestive system is weak will start to bother your digestive lining and could contribute to leaky gut.37 So if garlic bothers your stomach, eat it with meals and lean on cooked garlic rather than giving it up.

SIBO and low-FODMAP plans. Garlic is one of the richest fructan foods, so count it on a low-FODMAP plan.4 That doesn't mean giving up the flavor. In my SIBO Protocol, 1 to 2 tablespoons of garlic-infused olive oil gives you garlic flavor without the fermentable fiber, and then onion and garlic come back one at a time in the third phase.47 The Healing Leaky Gut protocol also holds off on large amounts of raw onion and garlic early on.53

Skin and ears. Keep raw garlic in your food and off your skin. It can be tempting to tape a crushed clove over a sore spot, but crushed raw garlic left on skin, especially under a bandage, causes chemical burns, ranging from blisters to deep burns that have needed skin grafts, in babies and adults alike.545556 The skin and ear studies on this page used prepared products, so save your raw cloves for the kitchen.3542 With a torn eardrum, put no drops in your ear unless your doctor recommends them.57

Pregnancy and breastfeeding. Garlic in food is fine. Supplement amounts above food levels haven't been shown to be safe during pregnancy or breastfeeding, so stick with food amounts then.58

Breath and allergy. Worried about garlic breath? It's normal, and you can tame it: in a breath study, raw apple, raw lettuce or mint eaten right after garlic cut the compounds behind it.59 Allergic reactions are uncommon, but stop if you react.58

The bottom line

Garlic: frequently asked questions

References

1. Lawson LD, Hunsaker SM. Allicin Bioavailability and Bioequivalence from Garlic Supplements and Garlic Foods. Nutrients. 2018;10(7):812. doi:10.3390/nu10070812. PMID:29937536. PMCID:PMC6073756
2. Benavides GA, Squadrito GL, Mills RW, Patel HD, Isbell TS, Patel RP, et al. Hydrogen sulfide mediates the vasoactivity of garlic. Proc Natl Acad Sci U S A. 2007;104(46):17977-82. doi:10.1073/pnas.0705710104. PMID:17951430. PMCID:PMC2084282
3. Nantz MP, Rowe CA, Muller CE, Creasy RA, Stanilka JM, Percival SS. Supplementation with aged garlic extract improves both NK and γδ-T cell function and reduces the severity of cold and flu symptoms: a randomized, double-blind, placebo-controlled nutrition intervention. Clin Nutr. 2012;31(3):337-44. doi:10.1016/j.clnu.2011.11.019. PMID:22280901
4. Muir JG, Shepherd SJ, Rosella O, Rose R, Barrett JS, Gibson PR. Fructan and free fructose content of common Australian vegetables and fruit. J Agric Food Chem. 2007;55(16):6619-27. doi:10.1021/jf070623x. PMID:17625872
5. Ried K. Garlic lowers blood pressure in hypertensive subjects, improves arterial stiffness and gut microbiota: A review and meta-analysis. Exp Ther Med. 2020;19(2):1472-1478. doi:10.3892/etm.2019.8374. PMID:32010325. PMCID:PMC6966103
6. Josling P. Preventing the common cold with a garlic supplement: a double-blind, placebo-controlled survey. Adv Ther. 2001;18(4):189-93. doi:10.1007/BF02850113. PMID:11697022
7. Lissiman E, Bhasale AL, Cohen M. Garlic for the common cold. Cochrane Database Syst Rev. 2014;2014(11):CD006206. doi:10.1002/14651858.CD006206.pub4. PMID:25386977. PMCID:PMC6465033
8. Behrouz V, Zahroodi M, Clark CCT, Mir E, Atashi N, Rivaz R. Effects of Garlic Supplementation on Cardiovascular Risk Factors in Adults: A Comprehensive Updated Systematic Review and Meta-Analysis of Randomized Controlled Trials. Nutr Rev. 2026;84(1):1-35. doi:10.1093/nutrit/nuaf090. PMID:40580481
9. Axe J, Rubin J. The Biblio Diet. Hachette Book Group; 2025. ISBN 9781546008439 (herbs and spices chapter, garlic entry).
10. Axe J. The High Blood Pressure Protocol. DrAxe.com. 2026. p. 15 (Supplement Protocol, Recommended tier: aged garlic extract 600-1,200 mg daily).
11. Axe J. Top 50 Healing Herbs & Essential Oils. DrAxe.com protocol. 2026 (garlic, p. 13, Immune & Heart: crush and wait 10 minutes; add at the end; 1 to 2 cloves; TCM profile; nitric oxide and hydrogen sulfide; "Thins the blood: ask first with blood thinners and stop 7 days before surgery. Can cause heartburn"; "Safety & interactions" page: blood pressure medications, effects may add together).
12. Petrovska BB, Cekovska S. Extracts from the history and medical properties of garlic. Pharmacogn Rev. 2010;4(7):106-10. doi:10.4103/0973-7847.65321. PMID:22228949. PMCID:PMC3249897
13. The Holy Bible, King James Version. Project Gutenberg eBook #10. Numbers 11:5 quoted from this text.
14. U.S. Department of Agriculture, Agricultural Research Service. FoodData Central: Garlic, raw. FDC ID 169230 (SR Legacy, NDB 11215). Accessed October 22, 2026.
15. Penn State Extension. Garlic Production. Accessed October 22, 2026.
16. Bandyopadhyay R, et al. A Comparative Review of Phytochemical Composition, Bioactivity, and Health Implications of Single- and Multiple-Clove Garlic. ACS Omega. 2026;11:22393-22406. doi:10.1021/acsomega.5c11125. PMID:42040441. PMCID:PMC13103796
17. Axe J. The Bible's Grocery List: 10 Foods That Slow How Fast You Age. The Dr. Josh Axe Show. 2026 (Dr. Axe, solo episode: garlic, onions and leeks as the number nine biblical superfoods at 28:58; his bloodwork line at 30:11; YouTube https://www.youtube.com/watch?v=9AnNi1umufc&t=1811s).
18. Ried K, Travica N, Sali A. The effect of aged garlic extract on blood pressure and other cardiovascular risk factors in uncontrolled hypertensives: the AGE at Heart trial. Integr Blood Press Control. 2016;9:9-21. doi:10.2147/IBPC.S93335. PMID:26869811. PMCID:PMC4734812
19. Axe J. The Shocking Reason Your Anxiety, Brain Fog & Bloating May Start in Your Gut. The Dr. Josh Axe Show. 2026 (Dr. Axe: onions, garlic and leeks as gut-healing fiber at 37:52; YouTube https://www.youtube.com/watch?v=yumJczZ1_JM).
20. Axe J. Your Body Makes Its Own Master Antioxidant — Here's Why It Stops. The Dr. Josh Axe Show. 2026 (Dr. Axe, solo episode: the foods his mom ate during cancer treatment, garlic and onions as sulfur foods high in cysteine, at 30:56-31:26; adding sulfur to meals at 35:07; YouTube https://www.youtube.com/watch?v=7PSNoeU9OFQ).
21. Axe J, Cole W. Heal Your Cells. Avery; 2026. ISBN 9798217181353 (p. 368, heart protocol: garlic extract 600-1,200 mg/day; p. 65, sulfur-rich foods for detox enzymes).
22. Ried K. Garlic Lowers Blood Pressure in Hypertensive Individuals, Regulates Serum Cholesterol, and Stimulates Immunity: An Updated Meta-analysis and Review. J Nutr. 2016;146(2):389S-396S. doi:10.3945/jn.114.202192. PMID:26764326
23. Ried K, Toben C, Fakler P. Effect of garlic on serum lipids: an updated meta-analysis. Nutr Rev. 2013;71(5):282-99. doi:10.1111/nure.12012. PMID:23590705
24. Wang J, Zhang X, Lan H, Wang W. Effect of garlic supplement in the management of type 2 diabetes mellitus (T2DM): a meta-analysis of randomized controlled trials. Food Nutr Res. 2017;61(1):1377571. doi:10.1080/16546628.2017.1377571. PMID:29056888. PMCID:PMC5642189
25. Ried K, Frank OR, Stocks NP. Aged garlic extract reduces blood pressure in hypertensives: a dose-response trial. Eur J Clin Nutr. 2013;67(1):64-70. doi:10.1038/ejcn.2012.178. PMID:23169470. PMCID:PMC3561616
26. Ried K, Travica N, Sali A. The Effect of Kyolic Aged Garlic Extract on Gut Microbiota, Inflammation, and Cardiovascular Markers in Hypertensives: The GarGIC Trial. Front Nutr. 2018;5:122. doi:10.3389/fnut.2018.00122. PMID:30619868. PMCID:PMC6297383
27. Gardner CD, Lawson LD, Block E, Chatterjee LM, Kiazand A, Balise RR, et al. Effect of raw garlic vs commercial garlic supplements on plasma lipid concentrations in adults with moderate hypercholesterolemia: a randomized clinical trial. Arch Intern Med. 2007;167(4):346-53. doi:10.1001/archinte.167.4.346. PMID:17325296
28. Wlosinska M, Nilsson AC, Hlebowicz J, Hauggaard A, Kjellin M, Fakhro M, et al. The effect of aged garlic extract on the atherosclerotic process - a randomized double-blind placebo-controlled trial. BMC Complement Med Ther. 2020;20(1):132. doi:10.1186/s12906-020-02932-5. PMID:32349742. PMCID:PMC7191741
29. Matsumoto S, Nakanishi R, Li D, Alani A, Rezaeian P, Prabhu S, et al. Aged Garlic Extract Reduces Low Attenuation Plaque in Coronary Arteries of Patients with Metabolic Syndrome in a Prospective Randomized Double-Blind Study. J Nutr. 2016;146(2):427S-432S. doi:10.3945/jn.114.202424. PMID:26764322
30. Shaikh K, Kinninger A, Cherukuri L, Birudaraju D, Nakanishi R, Almeida S, et al. Aged garlic extract reduces low attenuation plaque in coronary arteries of patients with diabetes: A randomized, double-blind, placebo-controlled study. Exp Ther Med. 2020;19(2):1457-1461. doi:10.3892/etm.2019.8371. PMID:32010322. PMCID:PMC6966158
31. Budoff MJ, Takasu J, Flores FR, Niihara Y, Lu B, Lau BH, et al. Inhibiting progression of coronary calcification using Aged Garlic Extract in patients receiving statin therapy: a preliminary study. Prev Med. 2004;39(5):985-91. doi:10.1016/j.ypmed.2004.04.012. PMID:15475033
32. Axe J. The Antibiotic Lie and Natural Alternatives. The Dr. Josh Axe Show. 2024, at 31:02 (garlic as a broad-spectrum antibacterial and antiviral).
33. Axe J. How to Prevent & Heal Cold & Flu Naturally (Foods, Supplements, & Herbs for Rapid Recovery). The Dr. Josh Axe Show. 2024 (Dr. Axe, solo episode: warming herbs and his "super six" at 19:21-20:25; his sick-day soup at 28:11; YouTube https://www.youtube.com/watch?v=jw-cciZ5TTY).
34. Mohammadzadeh F, Dolatian M, Jorjani M, Alavi Majd H, Borumandnia N. Comparing the therapeutic effects of garlic tablet and oral metronidazole on bacterial vaginosis: a randomized controlled clinical trial. Iran Red Crescent Med J. 2014;16(7):e19118. doi:10.5812/ircmj.19118. PMID:25237588. PMCID:PMC4166107
35. Ledezma E, Marcano K, Jorquera A, De Sousa L, Padilla M, Pulgar M, et al. Efficacy of ajoene in the treatment of tinea pedis: a double-blind and comparative study with terbinafine. J Am Acad Dermatol. 2000;43(5 Pt 1):829-32. doi:10.1067/mjd.2000.107243. PMID:11050588
36. Axe J. The Candida Cleanse Protocol. DrAxe.com. 2026 (Top 8 antifungals, #6 garlic/allicin).
37. Axe J. Signs That You Have a PARASITE (How to Cleanse Naturally) | The Worm Queen. The Dr. Josh Axe Show. 2025 (Dr. Axe speaking at 27:16-27:57; YouTube https://www.youtube.com/watch?v=xVkbT32f8sQ).
38. Axe J. Heal From Parasites Protocol: The 30-Day System. DrAxe.com. 2026 (Top 8 antiparasitic herbs, #7 garlic (allicin), 500-1,000 mg or 2-4 cloves, "Eat it raw for full potency"; Top 10 anti-parasite foods, #1 raw garlic, 2-4 cloves; kill phase: raw garlic, 2-4 cloves daily).
39. Axe J. 60 Million Americans Have This Hidden Infection Right Now. The Dr. Josh Axe Show. 2026 (Dr. Axe, parasite-cleanse diet: garlic at 39:18; YouTube https://www.youtube.com/watch?v=fvOBcpB_Jkg).
40. Kianoush S, Balali-Mood M, Mousavi SR, Moradi V, Sadeghi M, Dadpour B, et al. Comparison of therapeutic effects of garlic and d-Penicillamine in patients with chronic occupational lead poisoning. Basic Clin Pharmacol Toxicol. 2012;110(5):476-81. doi:10.1111/j.1742-7843.2011.00841.x. PMID:22151785
41. Axe J. Ancient Remedies. Little, Brown Spark; 2021 (Prescriptions for 70+ Conditions, ear infection entry: garlic mullein oil, p. 237).
42. Sarrell EM, Mandelberg A, Cohen HA. Efficacy of naturopathic extracts in the management of ear pain associated with acute otitis media. Arch Pediatr Adolesc Med. 2001;155(7):796-9. doi:10.1001/archpedi.155.7.796. PMID:11434846
43. Bashiri S, TaghipourSheshdeh F, Foshati S, Askarpour M, Ahmadi A, Babajafari S. The Effect of Aged Garlic Supplementation on Blood Pressure and Lipid Profile: A Dose-Response Grade-Assessed Systematic Review and Meta-Analysis of Randomized Controlled Trials. Phytother Res. 2025;39(12):5669-5694. doi:10.1002/ptr.70032. PMID:40628369
44. Luo JF, Dong Y, Chen JY, Lu JH. The effect and underlying mechanisms of garlic extract against cognitive impairment and Alzheimer's disease: A systematic review and meta-analysis of experimental animal studies. J Ethnopharmacol. 2021;280:114423. doi:10.1016/j.jep.2021.114423. PMID:34273446
45. Song K, Milner JA. The influence of heating on the anticancer properties of garlic. J Nutr. 2001;131(3s):1054S-7S. doi:10.1093/jn/131.3.1054S. PMID:11238815
46. Cavagnaro PF, Camargo A, Galmarini CR, Simon PW. Effect of cooking on garlic (Allium sativum L.) antiplatelet activity and thiosulfinates content. J Agric Food Chem. 2007;55(4):1280-8. doi:10.1021/jf062587s. PMID:17256959
47. Axe J. SIBO Protocol: The 60-Day Healing Protocol. DrAxe.com. 2026 (Top 8 SIBO remedies, #3 allicin; Top 10 SIBO-friendly foods, #9 garlic-infused olive oil; limit onion and garlic, reintroduce in Phase 3).
48. Macan H, Uykimpang R, Alconcel M, Takasu J, Razon R, Amagase H, et al. Aged garlic extract may be safe for patients on warfarin therapy. J Nutr. 2006;136(3 Suppl):793S-795S. doi:10.1093/jn/136.3.793S. PMID:16484565
49. Piscitelli SC, Burstein AH, Welden N, Gallicano KD, Falloon J. The effect of garlic supplements on the pharmacokinetics of saquinavir. Clin Infect Dis. 2002;34(2):234-8. doi:10.1086/324351. PMID:11740713
50. Ang-Lee MK, Moss J, Yuan CS. Herbal medicines and perioperative care. JAMA. 2001;286(2):208-16. doi:10.1001/jama.286.2.208. PMID:11448284
51. Rose KD, Croissant PD, Parliament CF, Levin MB. Spontaneous spinal epidural hematoma with associated platelet dysfunction from excessive garlic ingestion: a case report. Neurosurgery. 1990;26(5):880-2. doi:10.1097/00006123-199005000-00026. PMID:2352608
52. Scharbert G, Kalb ML, Duris M, Marschalek C, Kozek-Langenecker SA. Garlic at dietary doses does not impair platelet function. Anesth Analg. 2007;105(5):1214-8. doi:10.1213/01.ane.0000287253.92211.06. PMID:17959943
53. Axe J. Healing Leaky Gut Protocol: The 30-Day System. DrAxe.com. 2026 (Restore phase: avoid raw onion and garlic in large amounts early on).
54. Rafaat M, Leung AK. Garlic burns. Pediatr Dermatol. 2000;17(6):475-6. doi:10.1046/j.1525-1470.2000.01828.x. PMID:11123784
55. Bunstine R, Lloyd CM. Blistering Bulbs: The Hidden Dangers of Garlic as a Home Remedy. Cureus. 2025;17(12):e100429. doi:10.7759/cureus.100429. PMID:41625932. PMCID:PMC12854388
56. Hach A, Jost Y, Häuser H, Warszawski J, Ernst J, Ziegler B, et al. Garlic (Allium sativum)-Induced Chemical Burns-A Current Review of Treatment Techniques and a Case Report. Handchir Mikrochir Plast Chir. 2026. doi:10.1055/a-2862-1764. PMID:42580747
57. NHS. Perforated eardrum. NHS website; accessed October 22, 2026 ("do not put anything inside your ear, such as cotton buds or eardrops (unless a doctor recommends them)").
58. National Center for Complementary and Integrative Health. Garlic. NCCIH; accessed October 22, 2026.
59. Mirondo R, Barringer S. Deodorization of Garlic Breath by Foods, and the Role of Polyphenol Oxidase and Phenolic Compounds. J Food Sci. 2016;81(10):C2425-C2430. doi:10.1111/1750-3841.13439. PMID:27649517
60. Li WQ, Zhang JY, Ma JL, Li ZX, Zhang L, Zhang Y, et al. Effects of Helicobacter pylori treatment and vitamin and garlic supplementation on gastric cancer incidence and mortality: follow-up of a randomized intervention trial. BMJ. 2019;366:l5016. doi:10.1136/bmj.l5016. PMID:31511230. PMCID:PMC6737461
61. Hibbard-Swanson J, Waite-Cusic J. Infusing honey safely (EM 9885). Oregon State University Extension Service; July 2026. Accessed October 22, 2026 (fresh garlic is a high-moisture, low-acid ingredient for hot infusions only; honey that bubbles or smells sour has spoiled).
62. Chan JM, Wang F, Holly EA. Vegetable and fruit intake and pancreatic cancer in a population-based case-control study in the San Francisco bay area. Cancer Epidemiol Biomarkers Prev. 2005;14(9):2093-7. doi:10.1158/1055-9965.EPI-05-0226. PMID:16172215
63. Challier B, Perarnau JM, Viel JF. Garlic, onion and cereal fibre as protective factors for breast cancer: a French case-control study. Eur J Epidemiol. 1998;14(8):737-47. doi:10.1023/a:1007512825851. PMID:9928867
64. Bhat GS, Shastry A. Prospective, randomized, placebo-controlled, two-arm study to evaluate the efficacy of coadministration of garlic as a hydrogen sulfide donor and tadalafil in patients with erectile dysfunction not responding to tadalafil alone - A pilot study. Indian J Pharmacol. 2024;56(4):242-247. doi:10.4103/ijp.ijp_310_23. PMID:39250620. PMCID:PMC11483042
65. Hajheydari Z, Jamshidi M, Akbari J, Mohammadpour R. Combination of topical garlic gel and betamethasone valerate cream in the treatment of localized alopecia areata: a double-blind randomized controlled study. Indian J Dermatol Venereol Leprol. 2007;73(1):29-32. doi:10.4103/0378-6323.30648. PMID:17314444

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