L-Lysine, Double Strength 1000 mg
WhatToTrustTM Score
12345678910
NOW®
Last updated: Mar 08, 2026
Lysine is an essential amino acid that must be obtained through the diet or through supplementation. Lysine is necessary for the production of all proteins in the body, and is required for the maintenance of the structural proteins collagen and elastin, which form all connective tissues such as skin, tendon, and bone. Lysine is also a precursor to carnitine, which is needed for fat metabolism and energy production. In addition, lysine may help to support a healthy immune system and proper cardiovascular function.*
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Ingredients*
We only evaluate bioactive ingredients—the ones that truly contribute to a product's performance. Below is a list of bioactive ingredients found in this product.
For each ingredient, the quantity in parentheses indicates the amount per serving.
L-Lysine is an essential amino acid often promoted for various potential benefits, including supporting immune health, collagen production, and the prevention of herpes outbreaks, though more research is needed to fully understand its effects.
*These product and ingredient description statements have not been evaluated by the Food and Drug Administration (FDA). This product or its ingredients are not intended to diagnose, treat, cure or prevent any disease.
Product description and ingredient list are obtained from the product's brand/company website. Ingredient description is provided by our expert.
WhatToTrustTM scores are based on ingredient quality tests as well as pre-clinical and clinical testing to ensure that a product is scientifically developed and manufactured.
Breakdown of WhatToTrustTM Score for this product
WhatToTrustTM Science Score
10/10
Ingredient Quality Testing (Batch-to-Batch Testing)
Identity and Potency Testing
yes
Purity/Contaminant Testing
yes
Ingredient Validation Testing
Ingredient Validation Pre-clinical Testing (non-Canomiks test)
no
CanTrust by Canomiks® Ingredient Validation Pre-clinical Testing and Certification
no
Ingredient Clinical Trial/Testing
yes - (Product website does not mention clinical trial, but similar ingredients 've been clinically tested.)
Borrowed Science
no
Product Validation Testing
Product Validation Pre-clinical Testing (non-Canomiks test)
no
CanTrust by Canomiks® Product Validation Pre-clinical Testing and Certification
no
Product Clinical Trial/Testing
yes - (Product website does not mention clinical trial, but similar products have been clinically tested.)
Borrowed Science
no
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WhatToTrustTM Score
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