L-Lysine 500 mg

500 mg · Free Form Amino Acid

L-Lysine 500 mg

500 mg · Free Form Amino Acid

90 Vegetarian Capsules (SKU 2823), 180 Vegetarian Capsules (SKU 2858)

  • Helps reduce the recurrence, severity, and healing time of cold sores
  • Used therapeutically for HSV infections
  • Supports collagen formation and tissue repair
  • Provides an essential amino acid for muscle protein synthesis
  • Contributes to the maintenance of good health
  • Product informationProduct information
  • Nutritional factsNutrition
  • Advanced infoExtra
  • Questions


Natural Factors L-Lysine is an essential amino acid supplement that helps reduce the recurrence of the herpes simplex virus (HSV). It targets stubborn cold sores, helping to reduce severity and healing time. The body needs L-lysine for muscle protein synthesis, and to form collagen and repair tissues such as the skin, tendons, and bones. Each capsule contains 500 mg of L-lysine in its most active free form.

Medicinal Ingredients

Each vegetarian capsule contains:
L-lysine (hydrochloride) 500 mg

Non-Medicinal Ingredients

Vegetarian capsule (carbohydrate gum [cellulose], purified water), rice flour, vegetable grade magnesium stearate (lubricant), silica.

Suggested Use

  • L-lysine is an essential amino acid involved in muscle protein synthesis, collagen formation, and the maintenance of good health.
  • L-lysine helps to reduce the recurrence of herpes simplex virus (HSV) infection (e.g., cold sores).

Advanced Info

Natural Factors L-Lysine provides relief from the herpes simplex virus (HSV), helping reduce the recurrence, severity, and healing time of cold sores. As one of the nine essential amino acids that the body relies on to manufacture protein, L-lysine has important roles in the synthesis of collagen, tissue repair, and the production of hormones and enzymes. This makes L-lysine an important nutrient for maintaining a healthy immune system, especially when combined with an adequate intake of vitamin C.

L-lysine is considered “essential” because the body cannot manufacture it and it must be obtained through dietary sources. People with HSV can include L-lysine as part of their nutritional strategy to help keep the virus in check and prevent flare-ups of uncomfortable lesions around the mouth and genitals.

Natural Factors L-Lysine is a pharmaceutical-grade, free-form amino acid, meaning it is more effective than the form obtained directly from food. Each two-capsule serving provides 1000 mg of L-lysine to be taken three times per day for the most effective absorption. This is a great choice for anyone who is prone to HSV flare-ups, as well as vegetarians and other people who may not get sufficient L-lysine through their diet.

Amino Acids Immune Support

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