Best Glycine Supplement (2026): Same Molecule, 12x Price Gap
Informational summary — not medical advice. Glycine is well tolerated, but if you take clozapine ask your prescriber first (glycine may reduce its effect). This page ranks product value; on what glycine actually does, see the evidence.
Glycine is one identical molecule — so the "best" one is really the cheapest verified one. The cost of a 3 g dose ranges ~12x across brands (about $0.10 to $1.17) for the same free-form glycine — a spread an independent 2025 ConsumerLab test also found (9¢ to over $1.00 per 3 g). Powder wins; capsules cost several times more per gram. Top pick: BulkSupplements Glycine Powder (1 kg).
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| Item | Value |
|---|---|
| BulkSupplements | $0.10 |
| NOW powder | $0.12 |
| Nutricost | $0.14 |
| NOW capsule | $0.35 |
| Double Wood | $0.40 |
| NutraBio | $0.40 |
| Thorne | $0.74 |
| Pure Encapsulations | $1.17 |
The awards
Pure free-form glycine powder at about 10 cents per 3 g dose — the cheapest verified cost per gram here, and chemically identical to the products that cost 12x more. If you are fine with powder, this is the rational buy.
A near-tie on price from a mainstream, widely-trusted name. Pure powder, "pharmaceutical grade" free-form glycine, still near the value floor per gram.
The cheapest capsule if you refuse to measure powder — but note it takes three 1,000 mg capsules to reach a 3 g dose, so it still costs roughly 3x the powder per gram.
The reassurance pick: a third-party-certified capsule from a brand trusted by athletes. About 7x the value powder per gram — you are paying for the certification and name, not more glycine.
The one-line takeaway The cheapest here (BulkSupplements, $0.10/dose) and the priciest (Pure Encapsulations, $1.17/dose) contain the same free-form glycine. Pay more only for capsules or a certified brand — never for "better" glycine, which doesn't exist.
Every product compared, by cost per gram
Sorted cheapest-first. "Cost per 3 g dose" uses the dose from the sleep research (and ConsumerLab's test) so brands with different serving sizes compare fairly. Full data is a public CC BY JSON file.
| Product | Form | Glycine/container | Price | $ per gram | $ per 3 g dose | Testing |
|---|---|---|---|---|---|---|
| BulkSupplements Glycine Powder (1 kg) | Powder | 999 g | $32.97 | $0.033 | $0.10 | Third-party lab tested |
| NOW Foods Glycine Pure Powder (1 lb) | Powder | 453 g | $18.37 | $0.041 | $0.12 | GMP (NPA) |
| Nutricost Glycine Powder (1 lb) | Powder | 453 g | $21.95 | $0.048 | $0.14 | Independent lab tested |
| NOW Foods Glycine 1000 mg Capsules (100) | Capsule | 100 g | $11.62 | $0.116 | $0.35 | GMP (NPA) |
| Double Wood Glycine 1000 mg (300 capsules) | Capsule | 150 g | $19.95 | $0.133 | $0.40 | Third-party tested |
| NutraBio Glycine Powder (150 g) | Powder | 150 g | $19.99 | $0.133 | $0.40 | Fully-disclosed label / COA |
| Thorne Glycine (250 capsules) | Capsule | 125 g | $31.00 | $0.248 | $0.74 | Third-party certified |
| Pure Encapsulations Glycine (180 capsules) | Capsule | 90 g | $35.00 | $0.389 | $1.17 | NSF-audited GMP, hypoallergenic |
Prices are live Amazon buy-box figures (Creators API, July 2026); they move. Cost per gram = price ÷ total grams of glycine (servings × glycine per serving). Cost per 3 g dose = cost per gram × 3.
Before you buy: you may already own glycine
Two supplements a lot of people already take are quietly big glycine sources. Magnesium glycinate is about 86% glycine by weight of the chelate — a 200 mg elemental-magnesium dose carries roughly 1.2–1.3 g of glycine. Collagen is roughly a third glycine, so a 10 g scoop delivers about 2–3 g. Neither discloses the glycine milligrams, so you can't price it — but if you take either, you may need less (or no) separate glycine. The full breakdown is in glycine vs magnesium glycinate vs collagen.
Frequently asked questions
What is the best glycine supplement?
The cheapest verified one, since glycine is a single identical molecule. Best overall: BulkSupplements powder (~$0.10 per 3 g dose). NOW powder is a near-tie from a bigger brand; NOW capsules are the cheapest capsule; Thorne is the certified premium pick. An independent 2025 ConsumerLab test found the same wide spread across products containing identical glycine.
Is expensive glycine better than cheap glycine?
No. Free-form glycine is chemically identical at 3¢ or 39¢ a gram. ConsumerLab found a 9¢-to-$1.00+ range per 3 g dose across ten products, all containing the same glycine. You pay for brand, capsule form, and certification — not better glycine.
Glycine powder or capsules?
Powder is far cheaper per gram (a 3 g dose is six 500 mg capsules). Glycine powder is naturally sweet and dissolves easily. Choose capsules only for convenience/portability — you'll pay a large premium per gram.
Related
- Glycine: what it is & who it's for
- Glycine dosage guide — how much for sleep, and a cost calculator
- Does glycine actually work? — the honest evidence
- Glycine vs magnesium glycinate vs collagen
Sources
- ConsumerLab. "Best Glycine Supplements" (independent test of 10 products). 2025. consumerlab.com (topline finding public; brand results member-only).
- Manufacturer labels and live Amazon pricing for all listed products, July 2026. Full dataset: /glycine/cost-by-brand.json (CC BY 4.0).