L-Glutamine
Full ranking Dose tool Products (948)
Key facts
Sources: https://webprod.hc-sc.gc.ca/nhpid-bdipsn/atReq?atid=l.glutamine2&lang=eng · Health Canada NNHPD monograph: 5-9 g L-glutamine/day
Daily dose across products (mg/day)
Label data from official national databases and brand websites, as declared; not lab-verified.
Common questions
Is there an official upper limit for L-Glutamine?
No UL has been set. We use a cited reference upper value of 9,000 mg per day. It comes from the linked study or assessment and is not a regulatory limit. [source]
How much L-Glutamine do products usually contain per day?
As of 2026-11-01, 948 products list a comparable daily dose (962 dose records; one product can have several). The median is 1,000 mg per day, and 90% of records fall between 30 and 5,000 mg. Figures come from labels and are not lab-tested. [source]
What happens if you take too much L-Glutamine?
Studies reported no side effects in adults taking up to 45 g a day for several weeks. Adults get about 3–6 g a day from food. (Source: NIH ODS) [source]
Top ranked
| Rank | Brand | Product | Per day | Score |
|---|---|---|---|---|
| 1 | Twinlab | L-Glutamine | 500 mg | 100.0 |
| 1 | XYMOGEN | L-Glutamine | 4,000 mg | 100.0 |
| 1 | Nature's Sunshine | L-Glutamine | 1,000 mg | 100.0 |
| 1 | MET-Rx | L-Glutamine 1000 | 4,000 mg | 100.0 |
| 1 | Spring Valley | L-Glutamine 500 mg | 4,000 mg | 100.0 |