L-Lysine
Full ranking Dose tool Products (573)
Key facts
Daily Value (US FDA)—
Tolerable Upper Intake Level (UL)— Reference upper value (cited, not a UL): 3,000 mg
Median (Per day)500 mgP5 12 – P95 1,970
Products573
Sources: https://webprod.hc-sc.gc.ca/nhpid-bdipsn/atReq?atid=lysine2&lang=eng · Health Canada NNHPD monograph: 133-3,000 mg L-lysine/day
Daily dose across products (mg/day)
Reference upper value (cited, not a UL) 3,000
0.38 mglog scale · n=5737,218 mg
Label data from official national databases and brand websites, as declared; not lab-verified.
Common questions
Is there an official upper limit for L-Lysine?
No UL has been set. We use a cited reference upper value of 3,000 mg per day. It comes from the linked study or assessment and is not a regulatory limit. [source]
How much L-Lysine do products usually contain per day?
As of 2026-11-01, 573 products list a comparable daily dose (583 dose records; one product can have several). The median is 500 mg per day, and 90% of records fall between 12 and 1,970 mg. Figures come from labels and are not lab-tested. [source]
Top ranked
| Rank | Brand | Product | Per day | Score |
|---|---|---|---|---|
| 1 | GNC | GNC L-Lysine 1000 Tablet | 1,000 mg | 93.3 |
| 1 | Designs for Health | L-Lysine | 750 mg | 93.3 |
| 1 | New Roots Herbal Inc. | L-Lysine | 500 mg | 93.3 |
| 1 | Prairie Naturals Health Products Inc. | L-Lysine | 400 mg | 93.3 |
| 1 | Vita Health Products Inc. | L-Lysine 1000 mg | 1,000 mg | 93.3 |
For information only; not medical advice. Talk to a doctor or pharmacist before starting or stopping any supplement.