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SUPPLEMENTS·THORNE
Thorne Glycine (250 capsules, 1 g per serving)
4.8 · 77 reviews
Editor score8.5/10
Best for: A single-ingredient amino acid with NSF Contents Certification
Amount per serving
1 g glycine (2 capsules)
Count
250 capsules
Form
Capsule (openable — mildly sweet powder)
Single-ingredient glycine, NSF Contents Certified — 250 capsules at 500 mg each.
Glycine is an amino acid. Thorne's version is 500 mg per capsule (1 g per 2-capsule serving), third-party tested with NSF Contents Certification. 250 capsules per bottle at $31.
Price across 2 retailers
Prices checked 2026-08-02THORNE
Thorne.com
Brand direct · NSF Contents Certified
$31.00
2026-08-02
Price shown for comparison
amazon
AmazonBest price✓ Fast delivery · easy returns
250-capsule listing
$31.00
2026-08-21
Prices shown were last checked on 2026-08-02and can change at any time — the price on the retailer's site at checkout is the one that applies. As an Amazon Associate and affiliate we may earn a commission on purchases made through these links, at no extra cost to you.
How our prices work
We show the lowest price we found at our last check (2026-08-02) and the manufacturer's list price for comparison. Retail prices — Amazon's especially — move constantly, so treat these as a guide: the price shown on the retailer's own page at checkout is the one that applies. Tap through to see each retailer's current price.
Should you buy it?
What we like
- NSF Contents Certified — a test of what's actually in the capsule
- Minimal excipients, single active ingredient
- Mildly sweet — capsules can be opened into water
- 250 capsules is a large bottle for the price
What to know before buying
- Bulk glycine powder elsewhere is far cheaper per gram
- 500 mg per capsule means a lot of capsules for a gram-scale intake
At a glance
Amount per serving1 g glycine (2 capsules)
Count250 capsules
FormCapsule (openable — mildly sweet powder)
CertificationNSF Contents Certified
Other ingredientsCalcium laurate, cellulose, hypromellose
CautionConsult a doctor if pregnant (brand guidance)
Best forSingle-ingredient, contents-certified glycine
Compare with alternatives
Quick verdicts for the supplements most often considered alongside the Thorne Glycine (250 capsules, 1 g per serving).
VS·HEAD-TO-HEAD
Thorne Glycine (250 capsules, 1 g per serving) vs Doctor's Best High Absorption Magnesium Glycinate 200mg (240ct)
The highest-rated magnesium on Amazon — 240 tablets from Doctor's Best.
→ Value-focused buyers, athletes
VS·HEAD-TO-HEAD
Thorne Glycine (250 capsules, 1 g per serving) vs NOW Foods L-Theanine 200mg (120ct)
The best-value pure L-theanine — 200mg per capsule, GMP-certified, and $15.79 for 120 servings.
→ Single-ingredient theanine at the lowest cost per capsule
VS·HEAD-TO-HEAD
Thorne Glycine (250 capsules, 1 g per serving) vs Thorne Magnesium Bisglycinate Powder (60 servings)
The athlete-grade magnesium — NSF Certified for Sport, powder format, same chelate as our value pick at three times the price.
→ Drug-tested athletes, tablet-haters, flexible dosing
Decision support · what no other comparison site has
Take the quiz · 60 secNot sure which one is right for you?
Our 60-second sleep score quiz asks 8 questions and recommends the right sleep gear for your goals. Built by sleep engineers. Free, no signup.
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Frequently asked questions
How much glycine do studies use for sleep?
We don't publish dosing guidance — ask a pharmacist or your doctor.
Glycine vs magnesium glycinate — don't I already get glycine?
Magnesium glycinate is a chelate: magnesium bound to glycine, sold as a way of delivering the magnesium. This product is glycine on its own, with no magnesium in it. Different products, and the glycine amounts are not comparable.
What does glycine actually do for sleep?
See /natural-sleep-remedies for what the trial evidence actually shows.
Why not just buy bulk glycine powder?
You can, and it is cheaper per gram. Thorne's premium buys NSF Contents Certification — an independent test of what is actually in the capsule — plus a clean excipient list. That is what you are paying for, not economy.
Affiliate disclosure: SleepyHero earns a small commission when you buy through these links. It doesn't cost you extra. Reviews and rankings are editorial — we don't accept payment for placement.