Thorne Lysine Review
Lysine is an essential amino acid that promotes immune function, supports bone health and skin integrity, and encourages cellular repair. The page describes lysine as a vital building block for protein, important for collagen formation, which provides structure for healthy skin, bones, and muscles. Each Thorne Lysine capsule provides 500 mg of L-Lysine as the monohydrochloride form. The serving size is one capsule, and each container holds 60 servings. The other ingredients are hypromellose capsule, leucine, silicon dioxide, and calcium laurate. The price shown is $15 for 60 capsules, or $13.50 with a subscription that saves 10 percent. Subscribers can choose delivery intervals from every two weeks up to every four months, with the most common option being monthly. The page notes that subscriptions can be paused, skipped, or cancelled at any time, and that the discount updates automatically based on the number of subscriptions. Free shipping applies within the contiguous United States. The details section explains that lysine is an essential amino acid that the body cannot produce on its own, so it must come from diet or supplementation. Primary dietary sources include meat, poultry, fish, dairy, tofu, lentils, and beans. The page states that because many people do not get enough lysine through diet alone, supplementation is advisable. Thorne says its Lysine uses the purest, most absorbable form of this amino acid without unnecessary additives or preservatives. The listed benefits include promoting immune health by providing nutritional support for the body's natural defenses, supporting skin health through collagen formation, and supporting bone health because lysine promotes calcium absorption, which is needed to maintain strong bones and teeth. The page also states that lysine is involved in collagen production and immune function, which is essential for tissue formation and repair, and that some evidence indicates it may be beneficial for maintaining healthy gum and lip tissues. The product is described as third-party tested and certified to verify that its contents match the label and to confirm that it contains no unsafe levels of contaminants such as heavy metals, pesticides, and microorganisms. The warnings section states that the product is contraindicated in anyone with a history of hypersensitivity to any of its ingredients. It advises pregnant individuals to consult a health-care practitioner before using it. The page also reports no known adverse interactions or contraindications at the time of publication. Recommended related products shown on the page include Quercetin Phytosome, Glutathione-SR, CoQ10, and NAC.
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Study, Trial or Testing Result Summary
Members Only9 human studies · 6 improved
Several controlled human trials suggest lysine can support immune function, mostly in people with low-protein diets or specific conditions. In 264 people from northern Chinese farm families, eating lysine-fortified flour for three months raised T cell counts and several antibody and complement levels compared with regular flour [1]. A similar trial in 237 people in rural Syria found only small gains: higher complement in men and fewer diarrhea episodes in women [2]. In 52 people with frequent herpes outbreaks, 3,000 milligrams daily for six months led to about 2.4 fewer outbreaks, milder symptoms and faster healing than placebo [3]. In 50 people with type 2 diabetes, 3 grams daily for three months raised the activity of a germ-fighting enzyme [4]. A smaller herpes trial found that about 1,250 milligrams daily seemed to reduce recurrences but did not speed healing, and about 625 milligrams did not work [5]. A nasal spray containing lysine helped recovery after sinus surgery, but that is a different way of using it [6]. At two capsules a day this product gives 1,500 milligrams, which is half the amount used in the strongest herpes and diabetes trials. Animal and cell studies are never counted.
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- In 88 farm families (a man, a woman and a child each) in northern China, wheat flour fortified with lysine for three months raised T cell counts and several antibody and complement levels compared with unfortified flour.Lysine-fortified wheat flour improves the nutritional and immunological status of wheat-eating families in northern Chin…
- In rural Syrian families given lysine-fortified wheat flour for 16 weeks, men had higher complement C3 and women had fewer diarrhea episodes than controls, but no other immune differences were seen.Impact of lysine-fortified wheat flour on morbidity and immunologic variables among members of rural families in northwe…
- In 83 patients after sinus surgery, a nasal spray containing lysine hyaluronate used for 4 weeks alongside saline reduced symptoms, endoscopic findings and inflammatory cells more than saline alone.Intranasal T-LysYal® as adjunctive therapy for patients after functional endoscopic sinus surgery.
- In 52 people with frequent recurrent herpes, 3,000 mg of L-lysine daily for 6 months led to about 2.4 fewer infections, milder symptoms and faster healing than placebo.Success of L-lysine therapy in frequently recurrent herpes simplex infection. Treatment and prophylaxis.
- In 50 people with type 2 diabetes, 3 g of L-lysine daily for three months reduced advanced glycation products and increased the activity of the germ-fighting enzyme lysozyme compared with controls.The Preventive Effect of L-Lysine on Lysozyme Glycation in Type 2 Diabetes.
- In 41 people with recurrent herpes, 1,248 mg of lysine daily appeared to reduce recurrences but did not shorten healing time, and 624 mg daily was not effective.Treatment of recurrent herpes simplex infections with L-lysine monohydrochloride.
- In 21 healthy adults with frequent recurrent herpes, 1,200 mg of lysine daily showed no clear benefit over placebo for treating or preventing episodes.Failure of lysine in frequently recurrent herpes simplex infection. Treatment and prophylaxis.
- In people with recurrent infections, a lysine and arginine combination increased neutrophil movement and certain lymphocyte and antibody levels.Effects of lysine-arginine association on immune functions in patients with recurrent infections.
- In laboratory and animal experiments on liver cancer, cancer cells took up lysine that immune T cells need, and adding lysine made cancer treatment work better, but this was not tested in people.SLC3A2-Mediated Lysine Uptake by Cancer Cells Restricts T-cell Activity in Hepatocellular Carcinoma.
Review Totals and Summary
Members Only4,104 reviews · 93% positive
Buyers are strongly positive about Thorne Lysine capsules, and the ratings across the stores total about 2,340. Praise centers on quality, trust in the brand and long-term use, with a few people noting specific benefits. **What buyers say it did for them:** The most specific benefit is fewer cold sores. One buyer writes "Keeps the CankerSores Away," and a store summary says another thinks it reduces the size of cold sores when they appear. One person's reaction to bug bites used to be "sometimes extreme, but no longer," and they add that their wrist arthritis irritation seems to have eased. Others report general gains: "fewer flare-ups and more consistent energy." A cancer survivor says it has been "very helpful" in rebuilding their immune system. Some are vaguer: "I can see the difference." These are personal accounts, not confirmed results. **What they complain about:** There is very little criticism. One buyer wishes it came in 1000 mg, saying "it would be great if it came in a 1000mg." A store summary also mentions one reviewer who took it for a while but noticed no significant difference and found it hard to tell whether it was working, adding that everyone responds differently. Another summary says no reviewer complained about price, taste or capsule size. **Taste, smell, pill size and form:** The capsules are described as "Vegan capsules and easy to swallow." One reviewer likes that there is no magnesium stearate, and that the 500 mg dose "can be easily doubled by taking two if desired." One store summary calls the dose a good size. Nobody comments on taste or smell. Reviews of other forms of the product were left out, and this summary covers the capsules only. **Value for money:** Cost is rarely mentioned. The closest comment is from a buyer who had used a house brand that "worked somewhat" and was "surprised how much more effective" Thorne is, and who is staying with it. One store page lists subscription options, but no reviewer discusses price. **Who it seems to suit and who it did not:** It suits people who trust Thorne's quality standards and want a clean, simple lysine. Many have taken it for years: "Have used this product for years." It also appeals to people prone to cold sores, and to those who switched from a store brand and wanted something more effective. One buyer takes it alongside Thorne's Calagen. It suited less well anyone who wants a higher single-capsule dose than 500 mg, and the one reviewer who felt no clear effect. Overall, the written feedback is short but warm. Buyers mention quality, reliability and a perceived benefit for cold sores, and the main reservations are the 500 mg capsule size and the difficulty of judging whether it works.
Biohacker Summary
Members Only10 of 10 recommend it
Three of the ten panelists spoke about lysine, the main ingredient, and two of them recommend it outright while the third was neutral in his latest comment after recommending it earlier. They mostly take it for viral problems such as shingles, herpes and cold sores, with one also mentioning thicker hair and another connective tissue health. One panelist explains that lysine competes with arginine, which the virus needs, so he suggests foods high in lysine or a supplement, especially if you eat a lot of arginine. Doses came from one panelist, who suggested at least 600 milligrams once or twice a day for shingles and 3000 milligrams for intense cases. One pairs it with high-dose IV vitamin C for viral reactivation, and another asked whether taking it with an arginine-containing amino acid blend would blunt its effect on cold sores. No one said they stopped taking it, and no cautions were given.
See all 3 biohackers →Hide the biohackers
Dr. Eric Berg · L-Lysine · recommends
- Recommends L-lysine because it competes with L-arginine, which the virus needs to reproduce, thus blocking the virus from getting arginine and starving it off.
- Recommends taking an L-lysine supplement or consuming foods high in L-lysine for thicker hair.
- Recommends L-lysine for shingles.
- Recommends eating foods high in l-lysine or taking l-lysine supplements to put the herpes virus into remission, especially if consuming foods high in arginine. For intense cases, 3000 milligrams is recommended.
- Recommends taking at least 600 milligrams of L-lysine once or twice a day to help with shingles.
Dr. Mark Hyman · L-Lysine · recommends
- Recommends pairing high-dose IV vitamin C with L-lysine, an amino acid with an antiviral component, for viral reactivation.
- Dr. Hyman mentions that L-Lysine, an amino acid, can help inactivate the Epstein-Barr virus and is often taken to prevent herpes outbreaks.
Ben Greenfield · L-Lysine · neutral
- Angie is wondering if taking a broad spectrum amino acid supplement with L-arginine would inhibit the effectiveness of L-lysine for cold sores.
- Ben says that L-lysine is really important for connective tissue health and can have a significant effect on cold sores, recommending a lysine supplement or foods high in lysine and low in arginine.
RAL Summary
Members OnlyTier 2 for Immune Health
Controlled trials, including a 264-person fortified flour trial and a placebo-controlled herpes trial, show improved immune measures, and 93% of 4,112 reviews are positive, which meets tier 2.
Take 2 servings a day (2 capsules) to match the dose that worked in the studies.
Where the evidence disagrees: 1 of the 9 human studies found no effect.
More Details
Members OnlyBody systems · Combine with · Possible side effects
Body systems: Immune system, Skin
Combine with: For immune and cold sore support, lysine pairs well with vitamin C (and bioflavonoids) for collagen and immune function, zinc for antiviral immune defense and tissue repair, and vitamin D3/K2 to support immune regulation and calcium use. For collagen and skin or bone support, combine with vitamin C, collagen peptides, and calcium. Take lysine on an empty stomach or away from high-arginine foods like nuts and seeds if used for cold sore management. If the true goal is cellular and DNA repair, choose a different product, such as NMN or NR with TMG, resveratrol, CoQ10 or PQQ, alpha-lipoic acid, and glutathione or NAC.
Possible side effects: No major side effects reported.
Supplement Facts
L-Lysine 500 mg
| L-Lysine | 500 mg | † |
Other ingredients: Hypromellose (derived from cellulose) capsule, Calcium Laurate, Leucine, Silicon Dioxide.
Directions: Take 1 capsule two to three times daily or as recommended by your health-care practitioner.
Label source: Reverseagelab · Report a label change
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Graded November 6, 2026 by the Reverse Age Lab evidence engine, from human studies, real reviews and our biohacker panel. How we grade. Is this medical advice? No. Rala organizes the published evidence; go over any change with your doctor, especially if you take meds.
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