Basic Vitamins L-Lysine 500 mg Review
Basic Vitamins L-Lysine 500 mg is a single-ingredient dietary supplement. Each capsule or tablet delivers 500 mg of L-lysine, usually as L-lysine hydrochloride. Lysine is an essential amino acid. The human body can't synthesize it, so it has to come from food or supplements. Typical dietary sources are meat, fish, eggs, dairy and legumes. People who eat little animal protein, such as some vegetarians and vegans, may fall short of their needs. Others use it for targeted wellness goals. I could not verify the exact excipients, serving size or label claims for the Basic Vitamins listing. Check the Supplement Facts panel on the bottle before buying. Lysine takes part in several physiological processes: 1. **Protein synthesis.** Lysine is a building block of structural and functional proteins. It is especially important for muscle tissue, enzymes and hormones. 2. **Collagen formation.** Lysine is hydroxylated into hydroxylysine inside collagen. This step lets collagen fibers cross-link and gain tensile strength. It works alongside vitamin C and iron. This is why lysine is linked to skin, tendon, bone and wound-healing support. 3. **Calcium handling.** Lysine may help intestinal calcium absorption and reduce urinary calcium loss. This supports bone metabolism, although the evidence in humans is limited. 4. **Carnitine biosynthesis.** Lysine, together with methionine, is a precursor of carnitine. Carnitine transports long-chain fatty acids into mitochondria for energy production. 5. **Herpes simplex support.** This is the most common reason people take lysine. The virus needs the amino acid arginine to replicate. Lysine is thought to compete with arginine for cellular uptake and to limit arginine's availability. In theory this could reduce how often or how severely cold sores recur. Clinical trial results are mixed, so it should be seen as supportive and not as a proven treatment. Taking it is simple. Adults commonly take one to three 500 mg doses daily, often on an empty stomach or between meals. That timing reduces competition with other amino acids for absorption. High doses can cause nausea, stomach cramps or diarrhea. People with kidney or liver disease, people who are pregnant or nursing, and people taking calcium supplements or certain meds such as aminoglycosides should speak to a clinician first. It is a supplement, not a medicine. It is not intended to diagnose, treat, cure or prevent any disease.
Study, Trial or Testing Result Summary
Members Only9 human studies · 6 improved
Lysine has some human trial support for immune function, mostly in people with low-lysine diets or specific conditions. In northern Chinese farm families, flour with added lysine for three months raised T cell counts and several antibody and complement levels compared with regular flour [1]. A similar trial in rural Syria found only small gains: higher complement in men and fewer diarrhea episodes in women, with no other immune differences [2]. In people with frequent herpes outbreaks, 3,000 milligrams a day for six months led to about 2.4 fewer outbreaks, milder symptoms and faster healing than placebo [3]. In people with type 2 diabetes, 3 grams a day for three months raised the activity of the germ-fighting enzyme lysozyme [4]. Lower doses worked less well. About 1,248 milligrams a day seemed to reduce herpes recurrences but did not speed healing, and 624 milligrams a day did not work [5]. A nasal spray containing a lysine compound helped recovery after sinus surgery, but that is a different form from this capsule [6]. This product gives 500 milligrams per capsule. Even at the suggested daily amount, that is below the 3,000 milligrams that worked best in the 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 Only364 reviews
Reviewers of 500 mg L-lysine supplements are mostly positive, and the most common theme is cold sore prevention. Long-term users say they take it every day and get fewer or milder outbreaks. Many say they have reordered for years. Some say they take extra at the first sign of a flare-up. A related group uses it for shingles recovery. One reviewer also said it seemed to speed healing of insect bites. Smaller groups mention improved skin, softer lips and general immune support. Buyers frequently praise the value, especially large bottles of 250 capsules or more, and the affordable price. They also like the clean, non-GMO, USA-made positioning. Several people say capsules and caplets are easy to take. A notable share of buyers are buying for pets. Many give it to cats for immune support, and some say it helps with bladder crystals or other aging-related problems. Dogs are also mentioned. The main complaint is pill form. One Walmart reviewer disliked tablets that were large and had ridges on the sides, and said they were unpleasant to swallow. That reviewer went back to a previous brand. Shoppers who are sensitive to swallowing size should check the dosage form. Reviewers report few side effects, though lysine can upset the stomach at higher doses. Some buyers question whether it works for them, since results for cold sores vary a lot between people. Overall, satisfied customers describe it as an inexpensive, dependable staple. Complaints centre on tablet size and inconsistent personal results, not on quality or safety. These themes come from comparable products. Reviews of the Basic Vitamins brand itself may differ.
Biohacker Summary
Members Only6 of 10 recommend it
Three of the ten panelists spoke about L-lysine, the main ingredient here, and the two most active ones recommend it. Their main reason is viral trouble: one says it competes with arginine, an amino acid the herpes virus needs, and recommends it for shingles, herpes remission, and thicker hair, while another says it can help with Epstein-Barr virus and herpes outbreaks. The third panelist calls it important for connective tissue and helpful for cold sores, but his latest comment is neutral and only raises a question about whether a broad amino acid blend with arginine would blunt it. On doses, one panelist suggests at least 600 milligrams once or twice a day for shingles and 3000 milligrams for intense herpes cases, and the panel favors lysine supplements or foods high in lysine and low in arginine. One panelist pairs it with high-dose IV vitamin C for viral reactivation, and no one on the panel says they stopped taking it.
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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 4 for Immune Health
The review summary is drawn from comparable lysine products and includes pet use, not from reviews of this Basic Vitamins product, which has zero counted reviews. Its reviews are set aside, so it is graded on its studies alone. Human studies support L-Lysine (6 of 9 human studies showed an improvement), but there are not yet enough reviews to confirm it (0).
Take 3 servings a day (3 tablets) to match the dose that worked in the studies.
- Emerging: not enough evidence to rank higher yet.
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 support, pair L-Lysine with vitamin C (supports collagen synthesis and immune function), zinc (supports immune defense and tissue repair), and vitamin D3. Vitamin C and lysine together also support collagen formation. If the real goal is cellular and DNA repair or healthy aging, choose products with NAD+ precursors (NMN or nicotinamide riboside), resveratrol or pterostilbene, CoQ10, alpha-lipoic acid, and quercetin or fisetin, along with magnesium and B vitamins (folate, B12) for DNA methylation and repair. Take lysine away from high-dose arginine supplements, and check with a healthcare provider if you have kidney disease or are pregnant.
Possible side effects: No major side effects were reported in the studies given. Lysine can upset the stomach at higher doses.
Supplement Facts
L-Lysine 500 mg
| L-Lysine | 500 mg | † |
Other ingredients: Stearic Acid, Hypromellose, Polyethylene Glycol, Hydroxypropyl Cellulose, Carnauba wax.
Directions: Directions: For adults, take one (1) tablet two times daily, preferably with meals.
Barcode (UPC) 307610006102 · Label source: NIH label database · Report a label change
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Graded November 3, 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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