Amino Acid
L-Lysine
Also known as: Lysine
Essential amino acid important for collagen synthesis, calcium absorption, and herpes virus suppression.
Daily target & upper limit
1000 mg / dayL-Lysine has an established daily reference intake. See best forms, label synonyms, upper-limit warnings, and top-scoring supplements:
L-Lysine dosage reference →Primary uses
- Herpes prevention
- Collagen synthesis
- Calcium absorption
- Immune support
How it works
- Competes with arginine for herpes virus
- Essential for collagen cross-linking
- Enhances calcium absorption
Dosage
- Typical range
- 500-3000 mg daily
- Timing
- Any time; increase during outbreak
- With food
- Optional
- Duration
- Safe long-term
- Special populations
- Herpes sufferers, vegetarians
Forms
- Capsules
- Powder
Safety
Common side effects
- GI upset at high doses
Contraindications
- None
Products containing L-Lysine
Top-scoring supplements in our catalog that list L-Lysine on the label. Each product is graded on Formulate's ingredient-level rubric — dose accuracy, form, transparency, and third-party testing.
Evidence notes
Established for herpes prevention
Grade B: Some human trials support key claims; further confirmation needed.
L-Lysine compared head-to-head
Related in Amino Acid
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Open the checkerMedical disclaimer. This page is educational and does not replace advice from a qualified healthcare provider.