Lysine (L-Lysine) Benefits: Cold Sores, Stress, Foods & Dosage

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Lysine, also called L-lysine, is an essential amino acid, one of the nine protein building blocks your body can't make, so it has to come from food or a supplement.18 It's best known for cold sores, and lysine, together with zinc and vitamin C, is one of my top five ancient prescriptions for herpes, because these nutrients support your immune system and studies show they help reduce outbreaks.13

If you get cold sores, you probably know the pattern: a tingle on the lip, then the blister, often right when life is at its busiest. The virus behind them, herpes simplex type 1, is carried by about 3.8 billion people under age 50, roughly two-thirds of everyone in that age group, and after the first infection it rests quietly inside the nerves that serve your lips.1412 Sunlight, illness and stress can wake it up again.12 A cold sore means something has tipped the balance in the virus's favor, and getting to the root cause comes down to calming that stress, protecting your lips from strong sun and giving your body the protein it needs, lysine included.

Lysine helps because the herpes virus needs arginine, another amino acid, to copy itself, and lysine works against arginine.15 In the controlled trials that used 1 to 3 grams a day, many people saw their cold sores come less often or less severely.23 Lysine does quieter work in your body as well: it helps hold your collagen together, helps you absorb calcium, and taken together with arginine, it calmed the stress response in a week-long trial.564

Did you know?

• Lysine is the amino acid that runs shortest in grains, which is why researchers have tested lysine-fortified wheat flour in communities that live mostly on bread.11617

• Processing can lock up some of the lysine in protein foods. In a trial of 15 young men, milk protein heavily bonded to sugars released 18% of its lysine into the blood over 6 hours, against 49% for the same protein with little of that bonding.18

• Your body turns some of its lysine into carnitine, the molecule that ferries fat into your mitochondria to be burned for energy.7

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What is L-lysine?

Your body strings amino acids together to build every protein it makes, from muscle and skin to enzymes and antibodies. There are 20 of them, and nine are essential, which means they have to come from your food because your body has no way to make them.208 Lysine is one of those nine. The "L" in L-lysine simply names the form your body uses, so lysine and L-lysine mean the same thing on a food label or a supplement bottle, and most supplements use L-lysine hydrochloride, the form tested in the cold sore trials.23

Grains are where lysine runs short. Wheat, rice and other cereals carry less of it than your body needs relative to their other amino acids, so diets built mostly on bread or rice can leave people low, while animal foods, beans and lentils supply it generously.11619 In a small U.S. diet study of 16 people, average lysine intake was about 8 grams a day, roughly four times the 2 grams a 150-pound adult needs, and the researchers traced that to the American habit of eating plenty of meat and dairy.218

Your needs shift a little with age, too, and a 2024 study that measured lysine needs directly in 30 healthy adults over 60 found that men over 60 and women in their 60s needed about 32 to 33 milligrams per kilogram a day, while women over 70 needed about 46, roughly 50% more than the standard 30.22 If you're an older woman, that's one more reason to put protein at the center of every meal.

What does lysine do in your body?

I've written that protein isn't just about muscle; it's about longevity at the cellular level, because amino acids, proteins and peptides form the scaffolding and signaling system that keeps your body biologically young.20 Collagen, the protein that gives your skin, tendons and bones their strength, is a good example of that scaffolding. Think of it as a rope made of three strands twisted together, with every rope tied to its neighbors, and lysine supplies those ties. Enzymes called lysyl hydroxylases modify certain lysines inside each collagen chain, and those modified lysines go on to form the cross-links that hold the fibers together.5 Those enzymes need vitamin C to do their work, which is one reason vitamin C foods matter so much for your skin.23

Your body also builds carnitine from lysine, with help from another amino acid, methionine. Carnitine's main job is ferrying fats into your mitochondria, the energy factories inside your cells, where they're burned for fuel, and for people who eat meat, about three-quarters of their carnitine comes straight from food, with the rest made in the body.7

In the gut and the brain, lysine also touches the serotonin system. In studies of rats and of gut tissue, it partly blocked a serotonin receptor called 5-HT4 that sits in both places, calming serotonin-triggered gut contractions and blocking a serotonin-driven form of anxiety.24 Researchers proposed this as one reason lysine might steady both your mood and your digestion, and it's part of why they went on to test lysine for stress in people.

Does L-lysine kill viruses?

Lysine doesn't kill the herpes virus; it holds the virus back. It works by competing with arginine, an amino acid the virus needs to build its proteins and copy itself, so when lysine outweighs arginine, the virus has a harder time multiplying.15 It helps to picture a seesaw with lysine on one end and arginine on the other: the food you eat and the supplements you take decide which way it tips.

Researchers saw this in cell cultures, where tipping the balance toward lysine slowed the virus.15 In people, the clearest sign came from blood levels. In a 12-month trial, 26 people with frequent cold sores each tried both, taking 1 gram of lysine a day for six months and a placebo for six, all on a low-arginine diet. Their outbreaks fell significantly whenever blood lysine stayed above 165 nanomoles per milliliter (nmol/mL).2526 The steps from your plate to your lip connect like this:

Lysine benefits: what is it good for?

These seven benefits are in order of how strong the human research is for each, starting with the use most people know lysine for.

Lysine for cold sores: fewer, milder outbreaks

If you get cold sores several times a year, daily lysine is one of the simplest steps you can add, and the trial history shows how much it takes to make a difference. The first lysine studies in people came in the late 1970s, when an uncontrolled study of 45 people with frequent herpes outbreaks reported faster recovery and fewer recurrences on 312 to 1,200 milligrams a day, though it ran no statistics to test the difference.3526 The controlled trials that came after it are easiest to understand by dose.

At about 1 gram a day, the results were mixed. In a placebo-controlled trial of 65 people with recurring cold sores, each person took 1,000 milligrams a day for 12 weeks and a placebo for another 12. The total number of outbreaks didn't differ much (91 on lysine, 104 on placebo), but 27.7% of people stayed free of cold sores while on lysine, against 12.3% on placebo.3626

In a placebo-controlled trial of 31 people with lip or genital herpes, 1 gram a day for 3 months brought 40% fewer outbreaks than each person's past year predicted, against 25% fewer on placebo, though the researchers compared each group with its own past rather than with each other, and the difference disappeared when the dose dropped to 750 milligrams.372612 The 12-month blood-level trial, in which everyone also ate a low-arginine diet, found fewer sores in its second 6 months, 1.8 against 2.9 per person, along with the link to blood lysine above 165 nmol/mL, though its first 6 months showed no difference.2526

At about 1.25 grams a day, the trials split: the 41-person trial found fewer outbreaks at that dose but not at half of it, while in a placebo-controlled trial of 20 people, only 4 of whom had their herpes on the lips, 1.2 grams a day for 4 to 5 months made no measurable difference.23812 At 3 grams a day, the 6-month trial from the benefits list found an average of 2.4 fewer outbreaks in the lysine group, and milder ones.3 A 2017 review of these trials summed up the pattern: below 1 gram a day without a low-arginine diet, lysine looks ineffective, while doses above 3 grams a day seem to improve how people experience their outbreaks.26 When a 2015 Cochrane review applied its rules for which trials could count, only the first 6 months of the 12-month trial qualified, and on that slice it found no clear effect, rating the evidence very low certainty.12

Lysine does its best work as prevention. In the 41-person trial, neither dose shortened the time a sore took to heal, so daily lysine is about having fewer outbreaks to heal in the first place.2 Even prescription antiviral creams shorten a cold sore by about a day: in a 2026 Cochrane review, aciclovir cream cut healing time by 0.88 days and penciclovir cream by 1.2 days compared with placebo.39 That makes everyday prevention, from lysine and the rest of the plan below, the place where you can do the most good.

Lysine cream for cold sores

If you'd rather treat a sore directly, lysine also comes in creams and ointments, usually blended with zinc and herbs. In a pilot study of 30 adults with cold sores on the face who applied a lysine, zinc and herbal ointment, sores fully cleared in 40% of people by day 3 and in 87% by day 6, with no side effects reported. People knew what they were using, and there was no comparison group, but the authors noted that without treatment, a cold sore can last up to 21 days.40 Look for an ointment that pairs lysine with zinc, and use it as the label directs.

A cold sore plan that starts with lysine

Lysine works best as one part of a bigger plan, and in my top five ancient prescriptions for herpes, it sits beside licorice root, propolis, garlic and elderberry syrup.13 If your outbreaks tend to show up during a hectic holiday season or after a sunny vacation, those are the stretches to be most consistent with every step here.

1. Take lysine daily, with zinc and vitamin C. The lysine trials that helped used 1 to 3 grams a day, and the dosage section below covers how to take it.23

2. Soothe the sore. I recommend 1 or 2 drops of Melissa (lemon balm) oil on the sore three times a day, and 1 drop of tea tree oil in 1/4 teaspoon of coconut oil, also three times a day. A warm compress eases pain and swelling.13 If your skin is sensitive, mix the Melissa oil with a little coconut oil too.

3. Calm the stress. I recommend meditation, spiritual growth reading, exercise, walks in nature and some downtime every day.13 The stress section below explains why this matters for cold sores.

4. Eat for fewer outbreaks. Lean on fish, eggs and colorful vegetables and fruit, and go easy on sugar, alcohol and nut-heavy snacks; the foods section shows why.13

5. Protect your lips from strong sun. Ultraviolet light is one of the classic triggers for a cold sore, so a lip balm with sunscreen belongs in your bag for beach days and ski trips.12

Lysine, stress and anxiety

In traditional Chinese medicine, cold sores trace back to excess heat in the liver, often from emotions that have been held in, and as I've written, emotional distress is a common trigger for outbreaks.13 That's why calming your nervous system belongs in any cold sore plan, and why it's worth knowing that lysine may help on that side too.

In the 108-person Japanese trial, trait anxiety, the everyday level of worry you carry around, fell within a week from 53.06 to 47.26 on the amino acids, against 52.00 to 51.36 on placebo. Then everyone sat through 20 minutes of stressful mental tasks: anxiety in the moment climbed from 49.46 to 54.17 on placebo but held almost steady on lysine and arginine, at 47.00 before and 47.38 after. In the men, morning cortisol, the main stress hormone, fell from 0.56 to 0.46 µg/dL on the amino acids, while the women's didn't change.4

Two earlier trials point the same way. In northwest Syria, families who lived mostly on wheat bread got either lysine-fortified flour or regular flour for 3 months, and neither the people nor the researchers knew who got what. Among the 93 households that finished, anxiety scores fell by 6.9 points in the men who started out most anxious, a change the researchers set beside the 6.8 points reported for the anti-anxiety drug diazepam and 8.1 for fluoxetine in earlier studies on the same anxiety scale.17 In the women, the cortisol surge from having blood drawn was smaller.17 In a third, placebo-controlled trial, 29 healthy adults whose trait anxiety ran at the top of the normal range took 3 grams each of lysine and arginine a day for 10 days and then gave a speech. Their stress hormones rose more during the speech than on placebo, which the researchers read as a shift toward the response seen in calmer people.41 A lysine maker sponsored the Japanese trial, and its researchers took part in all three studies.17414

Researchers have also tried higher doses in people with schizophrenia, always alongside their medication: in a placebo-controlled trial of 72 inpatients, 6 grams of lysine a day with risperidone improved total, negative and general symptom scores more than placebo over 8 weeks.42

In my Stress, Anxiety & Mood Protocol, food comes first, starting with protein at every meal, because the brain chemicals that keep you calm are built from amino acids, and too little protein leaves too little to make them.43 Our guide to natural remedies for anxiety covers the herbs and habits that pair with it. And when worry about tomorrow keeps your body on alert, Jesus' words in Matthew 6:34 are worth carrying with you: "Take therefore no thought for the morrow: for the morrow shall take thought for the things of itself. Sufficient unto the day is the evil thereof."

Foods high in lysine

When it comes to protein, I put meat at the top, followed by eggs, with dairy up there as well, and for plant protein, beans, lentils, chickpeas, nuts and seeds are the best.45 For lysine, the animal foods lead, and beans, lentils and chickpeas are the strongest plant sources. The table lists lysine and arginine in common servings, from USDA data, along with the ratio between them, which matters if you get cold sores: a number above 1 means more lysine than arginine.9461147104448495051521953545556575859

Fish, poultry and meat lead the list, and sardines, wild salmon and cod are some of the best foods you can eat for lysine. Goat milk, sheep milk and goat cheese stand out for their balance, carrying about two and a half times as much lysine as arginine.515250 If you tolerate cow's dairy, cultured A2 dairy is an option too. Beans and lentils bring about a gram per cooked cup, and soaking or sprouting them first makes them easier to digest. If you eat soy, choose fermented forms such as tempeh, natto and miso.

I recommend grass-fed beef and lamb, and since red meat comes up in every conversation about protein, you should know how it's classified. The World Health Organization's cancer agency lists processed meat as Group 1, carcinogenic to humans, and red meat as Group 2A, probably carcinogenic.6061 As I've said on my show, the studies that link red meat to poor health mostly reflect grain-fed and processed meat, not the fresh, grass-fed red meat I recommend.62

If you eat enough protein, your lysine comes along with it. I recommend at least 30 to 40 grams of protein three times a day for most people, and if you're over 40, aim closer to 1 gram of protein per pound of body weight.6364 Three meals like that, built on fish, poultry, eggs or lamb, supply well over the 2 grams a 150-pound adult needs.89

High-lysine, low-arginine foods for cold sores

If you get cold sores, the balance between lysine and arginine matters, not only the total. For herpes, the foods I list to heal include zinc-rich foods such as eggs, liver and pumpkin seeds; wild-caught fish such as sardines and cod; and colorful vegetables and fruit such as asparagus, broccoli, spinach, carrots, squash, red bell peppers, blueberries, apples, kiwi and citrus, along with miso.13 The foods I list to limit start with packaged food, sugar, acidic food and alcohol, and they include foods that contain arginine, a list that takes in nuts, seeds, meat, legumes and seaweed.13

The table shows where that arginine is most concentrated. Nuts and seeds carry roughly three to four and a half times as much arginine as lysine, while fish, poultry and meat carry more lysine than arginine, and beans and lentils come out close to even.575859919 So during a stretch when outbreaks tend to strike, go easiest on the nut- and seed-heavy snacks and keep fish, poultry and eggs at the center of your plate. Pumpkin seeds sit on both of my lists, rich in zinc and also among the most arginine-heavy foods in the table, so a small sprinkle goes a long way. The liver on my zinc list can be beef liver, one of the richest foods in B vitamins and iron, and about 3 ounces once a week supports your energy and your body's detox work.

A few easy meals, most of them from the 7-day plan in my stress protocol, lean naturally toward lysine:43

• Sardines over greens with avocado and lemon, for lunch.

• Baked cod with sautéed greens and lentils, for dinner.

• Chicken and vegetable soup simmered in bone broth.

• A goat milk yogurt bowl with blueberries and kiwi, our goat-dairy take on the plan's yogurt breakfast.

Signs you may be low in lysine

The signs of running low on lysine are the signs of running low on protein, because a diet short on lysine is usually short on protein as a whole, and our guide to protein deficiency lists them. The people most likely to fall short are those who live mostly on grains, like the households in the Ghana trial, and women over 70, who need about 50% more lysine than the guidelines assume.2822 If you eat a plant-only diet, beans, lentils and chickpeas are your best lysine sources, so include them every day, since grains alone run short.19541

How much lysine should you take a day?

I believe food should always come first, and supplements are for filling the holes in your diet.65 For lysine, that means building your meals around the foods above and adding a supplement for a specific job, most often keeping cold sores at bay. Here are the amounts the research used:

Sources: WHO requirement8; cold sore trials363723; stress trial4; diabetes trial32.

How to take a lysine supplement

For cold sores, take lysine every day, because the trials tested daily prevention, and split it into two or three doses through the day; the 3-gram trial gave 1 gram three times a day.3 Give it time, too: the trials that helped ran 3 to 6 months.3623 Lysine pairs naturally with the zinc and vitamin C in my herpes prescription, and I recommend taking each according to the package directions.13 Tablets and capsules usually list the dose as L-lysine HCl, and those amounts sit comfortably inside the range that safety reviews have studied, as the next section explains.66

Lysine side effects and safety

Stomach upset. The most common complaints are nausea, stomachache and diarrhea, so if lysine bothers your stomach, split the dose and take it with meals.66

Kidney disease. One case report describes a 44-year-old woman who took lysine supplements and developed a serious kidney problem that progressed to chronic kidney failure.68 It's a single case, but if you have kidney disease, get your lysine from food rather than high-dose supplements.

Pregnancy and breastfeeding. Lysine from food belongs in a healthy pregnancy diet, but we found no human studies of lysine supplements in pregnancy or breastfeeding, so get your lysine from food during those months.

Cholesterol. In rats on a low-protein diet, large amounts of added lysine raised LDL cholesterol.69 In people, changing the diet's balance of lysine and arginine for 35 days didn't change LDL, HDL or other cholesterol measures in a trial of 30 adults with high LDL, in which each person tried both diets.70 Take lysine alongside a protein-rich diet, the way your body expects to get it.

The bottom line

Lysine: frequently asked questions

References

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50. U.S. Department of Agriculture, Agricultural Research Service. FoodData Central: Cheese, goat, soft type. FDC ID 173435. SR Legacy.
51. U.S. Department of Agriculture, Agricultural Research Service. FoodData Central: Milk, sheep, fluid. FDC ID 170882. SR Legacy.
52. U.S. Department of Agriculture, Agricultural Research Service. FoodData Central: Milk, goat, fluid, with added vitamin D. FDC ID 171278. SR Legacy.
53. U.S. Department of Agriculture, Agricultural Research Service. FoodData Central: Beans, black, mature seeds, cooked, boiled, without salt. FDC ID 173735. SR Legacy.
54. U.S. Department of Agriculture, Agricultural Research Service. FoodData Central: Chickpeas (garbanzo beans, bengal gram), mature seeds, cooked, boiled, without salt. FDC ID 173757. SR Legacy.
55. U.S. Department of Agriculture, Agricultural Research Service. FoodData Central: Quinoa, cooked. FDC ID 168917. SR Legacy.
56. U.S. Department of Agriculture, Agricultural Research Service. FoodData Central: Seaweed, spirulina, dried. FDC ID 170495. SR Legacy.
57. U.S. Department of Agriculture, Agricultural Research Service. FoodData Central: Seeds, pumpkin and squash seed kernels, dried. FDC ID 170556. SR Legacy.
58. U.S. Department of Agriculture, Agricultural Research Service. FoodData Central: Nuts, almonds. FDC ID 170567. SR Legacy.
59. U.S. Department of Agriculture, Agricultural Research Service. FoodData Central: Peanuts, all types, raw. FDC ID 172430. SR Legacy.
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61. World Health Organization. Cancer: Carcinogenicity of the consumption of red meat and processed meat (questions and answers). who.int
62. Axe J. 10 Biblical Superfoods That Can Add Years to Your Life. The Dr. Josh Axe Show, Episode 393. September 28, 2026. Red-meat studies and grain-fed meat at 21:03.
63. Axe J. Top 10 Reasons You're Not Healing. The Dr. Josh Axe Show. 2025 (Dr. Axe speaking at 8:19–8:27; YouTube https://www.youtube.com/watch?v=bjU77gf__x4).
64. Axe J. Burn Fat, Build Muscle, Live a LOT Longer. The Dr. Josh Axe Show. 2026 (Dr. Axe speaking at 17:54–18:15; YouTube https://www.youtube.com/watch?v=PKpftccZnv4).
65. Axe J. Cellular Health EXPERT: How to Build Bulletproof Cells for Energy, Detox & Longevity. The Dr. Josh Axe Show. 2025. Food first, supplements for the holes in your diet, at 53:16.
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Dr. Josh Axe, DC, DNM, CNS

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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.

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