L-Glutamine Hydrochloride vs. Glutamine Alpha-Ketoglutarate
Among 231 on-market l-glutamine products with an identifiable primary form, 35.9% use L-Glutamine Hydrochloride (83 products) and 20.3% use Glutamine Alpha-Ketoglutarate (47).
| L-Glutamine Hydrochloride | Glutamine Alpha-Ketoglutarate | |
|---|---|---|
| Quality tier | Unrated | Unrated |
| L-Glutamine by weight | 80.0% | — |
| Share of market | 35.9% | 20.3% |
| On-market products | 83 | 47 |
| Median declared dose | 160 mg middle half: 160–400 | 2,000 mg middle half: 1,000–2,000 |
| Most common brands | Universal, GNC AMP Advanced Muscle Performance, MMUSA | Justified Laboratories, PMD, Universal |
Doses are declared per serving in mg. “By weight” is the share of the ingredient that is the nutrient itself (e.g. elemental magnesium in a magnesium salt).
Why L-Glutamine Hydrochloride is unrated
Same amino acid delivered as a salt; no human study comparing glutamine HCl with free glutamine was located.
Why Glutamine Alpha-Ketoglutarate is unrated
No head-to-head human bioavailability or efficacy comparison of this form was located in PubMed searches.
Tiers summarize published comparative bioavailability or outcome evidence for each form (see methodology).
This page describes the market; it is not a recommendation to take either form. Talk to a clinician about what's right for you.