Glycine
Of 1,579 on-market glycine products in the January 2026 DSLD dump, the median declared dose is 260 mg, and 100.0% list Glycine (unmodified free amino acid) as the primary form.
Form share
Of 1,573 products with an identifiable primary form, here is the share held by each form of Glycine on the market today.
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| Form | Quality tier | n | Share |
|---|---|---|---|
| Glycine (unmodified free amino acid) | Tier 1 | 1,573 | 100.0% |
Form share over time
Entry-year breakdown of the top forms, 2012–2025.
Dose distribution
Deciles of declared dose per serving (mg), among 1,036 products with a disclosed amount.
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- 70.9% of products fall below the fairy-dust threshold (600 mg, 20% of the studied low dose).
- 32.9% of products don't disclose an amount because Glycine is declared inside a proprietary blend.
Where does your dose rank?
Enter a per-serving dose (mg) to see exactly how it compares to the 1,036 on-market glycine products with a disclosed amount. The chart above groups doses into deciles; this looks up the exact percentile for one number.
By dosage form
By target group
Top brands
Search interest over time
How often people search for glycine on Google, US only, the last 5 years. This is public interest, not DSLD label data — a spike here doesn't necessarily line up with anything on this page, and Google's own index (100 = that term's peak popularity in the chosen window) is relative, not an absolute search-volume count.
Or see this search directly on trends.google.com.
Forms explained
The form used in essentially all clinical glycine literature; glycine is the only proteinogenic amino acid with no stereocenter, so "L-Glycine" is a labeling convention/synonym, not a distinct or superior form.
Source: Bannai M et al. 2012, Front Neurol 3:61, PMID 22529837
Reference values
- RDA (adult): not established — Non-essential/conditionally-essential amino acid; the IOM/NASEM DRI report on protein and amino acids (2005) sets RDAs only for the nine indispensable amino acids, so no RDA exists for glycine.
- Tolerable Upper Intake Level (adult): not established — Not established -- no IOM/EFSA/FDA UL exists for glycine specifically.
- Studied clinical dose range: 3000–3000 mg
- Bannai M et al. 2012, Front Neurol 3:61, PMID 22529837 -- 3g glycine before bed after 3 nights of partial sleep restriction reduced next-day fatigue (VAS) and improved psychomotor vigilance task performance vs placebo, with a non-significant trend toward less sleepiness. [Study authors were employees of Ajinomoto, a major amino-acid manufacturer -- conflict-of-interest caveat worth carrying alongside this citation.]
- Note: Trimethylglycine (betaine/TMG) and Dimethylglycine (DMG), though sometimes marketed alongside glycine, are chemically and functionally DISTINCT compounds (methyl-donor/ osmolyte biology vs. glycine's neurotransmitter/collagen-precursor biology) -- modeled as separate compounds in this reference set, not as forms of glycine.