• Supports the immune system and body’s natural defenses.‡
  • Supports a healthy gut.‡
  • Supports healthy blood pressure levels.‡

$16.00 or Original price was: $16.00.Current price is: $14.40. / month

(Subscriptions can be managed in your account and cancelled at any time without penalty.)

SKU 990 Category


L-Lysine from Progressive Laboratories provides 500 mg of the L-lysine per vegetable capsule.  Lysine is an essential amino acid needed for growth and to help maintain nitrogen balance in the body.‡ (Essential amino acids cannot be made in the body and must be supplied by the diet or supplements).

L-Lysine, like all amino acids, has many functions in the body.  They are the building blocks for all proteins – from muscle to connective tissues, bones and other structures.  Amino acids are also the basis for functional proteins such as active enzymes.  Amino acids provide the body with the nitrogen that is essential for growth and maintenance of all tissues and structures.‡



Warning:  If you are pregnant or lactating woman, have any health conditions, or are taking any medication, make sure to consult your healthcare provider prior to use.

‡ These statements have not been evaluated by the Food and Drug Administration.
These products are not intended to diagnose, treat, cure or prevent any disease.



One vegetable capsule three times daily.


90 Vegetable Capsules


Smriga M, Torii K. L-Lysine acts like a partial serotonin receptor 4 antagonist and inhibits serotonin-mediated intestinal pathologies and anxiety in rats. Proc Natl Acad Sci U S A. 2003 Dec 23;100(26):15370-5. doi: 10.1073/pnas.2436556100. Epub 2003 Dec 15. PMID: 14676321; PMCID: PMC307574.

Smriga M, Ando T, Akutsu M, Furukawa Y, Miwa K, Morinaga Y. Oral treatment with L-lysine and L-arginine reduces anxiety and basal cortisol levels in healthy humans. Biomed Res. 2007 Apr;28(2):85-90. doi: 10.2220/biomedres.28.85. PMID: 17510493.

Smriga M, Ghosh S, Mouneimne Y, Pellett PL, Scrimshaw NS. Lysine fortification reduces anxiety and lessens stress in family members in economically weak communities in Northwest Syria. Proc Natl Acad Sci U S A. 2004 Jun 1;101(22):8285-8. doi: 10.1073/pnas.0402550101. Epub 2004 May 24. PMID: 15159538; PMCID: PMC420386.

Zeinoddini A, Ahadi M, Farokhnia M, Rezaei F, Tabrizi M, Akhondzadeh S. L-lysine as an adjunct to risperidone in patients with chronic schizophrenia: a double-blind, placebo-controlled, randomized trial. J Psychiatr Res. 2014 Dec;59:125-31. doi: 10.1016/j.jpsychires.2014.08.016. Epub 2014 Sep 6. PMID: 25227564.

Wass C, Klamer D, Katsarogiannis E, Pålsson E, Svensson L, Fejgin K, Bogren IB, Engel JA, Rembeck B. L-lysine as adjunctive treatment in patients with schizophrenia: a single-blinded, randomized, cross-over pilot study. BMC Med. 2011 Apr 18;9:40. doi: 10.1186/1741-7015-9-40. PMID: 21501494; PMCID: PMC3094237.