Best Glycine Supplements 2026: Cost per Effective Dose
Top pick for Glycine: BulkSupplements Glycine Powder (1 kg) — 3,000mg glycine per 1 scoop (3 g), Third-party lab tested, $0.10/day. Our best-value pick.
Registry check · Glycine
Does anyone independently verify Glycine supplements?
1 of the 8 Glycine products on this page is confirmed in NSF/ANSI 173: Thorne Glycine (250 capsules). Thorne Glycine (250 capsules) does not show the mark on the listing, so the table’s certification column, which repeats the listing, does not show it either. For the others, the listing may name a certification, but we did not find it in a public registry — that is not evidence against them, only an absence of independent confirmation.
Certification is not a dosing guarantee. Across the whole catalogue, certified products reach the clinically studied dose 57% of the time and uncertified ones 71% — a gap too small to mean anything (Fisher p = 0.185). Read the Glycine dose column either way.
The 8 products on this page checked against all 5,317 US NSF, USP and Informed Sport listings, 2026-08-25. Full method and limitations.
What Glycine labels show
Priced per day, these glycine products run $0.10 to $1.17 — a 12× gap between the cheapest and dearest glycine here, across 7 brands.
All Glycine Supplements Compared
| Product | Brand | Dose / Serving | Cost / Day | Certification (as labelled) | Pick | Buy |
|---|---|---|---|---|---|---|
| BulkSupplements Glycine Powder (1 kg) | BulkSupplements | 3,000mg glycine / 1 scoop (3 g) | $0.10 | Third-party lab tested | Best Value | Buy |
| NOW Foods Glycine Pure Powder (1 lb) | NOW Foods | 3,000mg glycine / 3/4 tsp (3 g) | $0.12 | GMP (NPA) | Buy | |
| Nutricost Glycine Powder (1 lb) | Nutricost | 3,000mg glycine / 1 scoop (3 g) | $0.15 | Independent lab tested | Buy | |
| NOW Foods Glycine 1000 mg Capsules (100) | NOW Foods | 1,000mg glycine / 1 capsule | $0.35 | GMP (NPA) | Buy | |
| Double Wood Glycine 1000 mg (300 capsules) | Double Wood | 1,000mg glycine / 2 capsules | $0.40 | Third-party tested | Buy | |
| NutraBio Glycine Powder (150 g) | NutraBio | 1,000mg glycine / 1 scoop (1 g) | $0.40 | Fully-disclosed label / COA | Buy | |
| Thorne Glycine (250 capsules) | Thorne | 1,000mg glycine / 2 capsules | $0.74 | Third-party certified | Buy | |
| Pure Encapsulations Glycine (180 capsules) | Pure Encapsulations | 1,500mg glycine / 3 capsules | $1.17 | NSF-audited GMP, hypoallergenic | Buy |
Our Picks
Best Value: BulkSupplements Glycine Powder (1 kg)
3,000mg glycine per 1 scoop (3 g). Third-party lab tested. $0.10/day. 333 servings per container at $32.97.
Dose check · Glycine
Most of these Glycine products need more than one serving to reach the studied dose
The research on Glycine uses 3,000 mg to 5,000 mg (free-form glycine, identical molecule across brands). The products here are labelled from 1,000 mg to 3,000 mg a serving, so for most of them one serving is less than the studied dose. NOW Foods Glycine 1000 mg Capsules (100) states 1,000 mg a serving, so it takes 3 servings to reach the studied amount. Check how many servings a product’s cost per day counts before you compare it.
The label trap on Glycine: a 3g dose is six 500mg capsules — capsules cost far more per gram than bulk powder
Method: studied range from our own Glycine dosage guide (PMID 22529837), checked against the 8 products above that state a dose — capsules in whole servings, powders in fractions. Trial doses, not a prescription.
The shelf · Glycine
Capsules cost 3.5× what powder does for the same Glycine
The molecule is the same either way; the premium buys encapsulation. Across these 8 Glycine products that gap runs from $0.10 a day (BulkSupplements Glycine Powder (1 kg)) to $1.17 (Pure Encapsulations Glycine (180 capsules)), and BulkSupplements Glycine Powder (1 kg) is the cheapest powder of the 4 here if you will actually weigh a dose.
Method: the 8 Glycine products above, compared on label facts, serving size, servings per container, form, price. Not a dosing recommendation.
How these 8 Glycine products were ranked
1 of these 8 is confirmed in a certifier's registry — the only glycine row where the claim is independently backed — and the rest are ranked on cost per day at the labelled serving. Commission does not enter it: the rate is the same whichever glycine you buy. Full methodology.