Best L-Lysine Supplements 2026: Cost per Effective Dose
Top pick for L-Lysine: Nutricost L-Lysine Powder (500 g) — 1,000mg L-lysine per 1 scoop (1 g), Manufactured in a GMP facility, $0.10/day. Our best-value pick.
All L-Lysine Supplements Compared
| Product | Brand | Dose / Serving | Cost / Day | Certification (as labelled) | Pick | Buy |
|---|---|---|---|---|---|---|
| Nutricost L-Lysine Powder (500 g) | Nutricost | 1,000mg L-lysine / 1 scoop (1 g) | $0.10 | Manufactured in a GMP facility | Best Value | Buy |
| BulkSupplements.com L-Lysine Powder (500 g) | BulkSupplements | 1,000mg L-lysine / 1 g (1,000 mg, per label) | $0.11 | Manufactured in a GMP facility | Buy | |
| Nutricost L-Lysine 1,000 mg (240 Tablets) | Nutricost | 1,000mg L-lysine / 1 tablet | $0.25 | Manufactured in a GMP facility | Buy | |
| Solgar L-Lysine 1,000 mg (250 Tablets) | Solgar | 1,000mg L-lysine / 1 tablet | $0.28 | Manufactured in a GMP facility | Buy | |
| Nature's Bounty L-Lysine 1,000 mg (60 Tablets) | Nature's Bounty | 1,000mg L-lysine / 1 tablet | $0.34 | Manufactured in a GMP facility | Buy |
Registry check · L-Lysine
Does anyone independently verify L-Lysine supplements?
We did not find any of these products in a public registry, and none of the listings names a certification mark. Where a listing names a mark, we say so in the table; where we could not find it in a registry, we say that instead.
The 5 products on this page checked against all 5,317 US NSF, USP and Informed Sport listings, 2026-08-25. Full method and limitations.
What L-Lysine labels show
Priced per day, these L-lysine products run $0.10 to $0.34 — a 3.4× gap between the cheapest and dearest L-lysine here, across 4 brands.
Servings here are close enough to compare directly, so the gap is a real one: Nutricost at $0.10 states about the same dose per serving as Nature's Bounty at $0.34.
Our Picks
Best Value: Nutricost L-Lysine Powder (500 g)
1,000mg L-lysine per 1 scoop (1 g). Manufactured in a GMP facility. $0.10/day. 500 servings per container at $15.95.
The shelf · L-Lysine
Capsules cost 2.8× what powder does for the same L-Lysine
The molecule is the same either way; the premium buys encapsulation. Across these 5 L-Lysine products that gap runs from $0.10 a day (Nutricost L-Lysine Powder (500 g)) to $0.34 (Nature's Bounty L-Lysine 1,000 mg (60 Tablets)), and Nutricost L-Lysine Powder (500 g) is the cheapest powder of the 2 here if you will actually weigh a dose.
Method: the 5 L-Lysine products above, compared on label facts, serving size, servings per container, form, price. Not a dosing recommendation.
How these 5 L-Lysine products were ranked
Not one of these 5 L-lysine products could be confirmed in the NSF, USP or Informed Sport registries, so verification separates none of them and the ranking falls to cost per day at the labelled serving. Commission does not enter it: the rate is the same whichever L-lysine you buy. Full methodology.