L-Glutamine

Evidence: ★★☆☆☆ · Status: OTC Supplement

💡 Did you know? Glutamine is the most abundant amino acid in your blood — and the primary fuel for the cells lining your gut.

In plain English

The main food for your gut-lining cells — helpful for repairing an irritated or "leaky" gut, less so for healthy athletes.

How it works

Primary fuel for enterocytes; supports tight-junction integrity ("leaky gut"), most relevant in catabolic/overtrained or IBS states.

Molecular target & official sources

L-Glutamine (PubChem CID 5961) · SLC1A5 glutamine transporter (NCBI Gene)

Protocol

5–10 g/day.

Bottom line

Situational gut-lining support.

Helps with: Recover Faster · Gut Health

Availability & where to buy

Available over the counter. Widely available OTC — e.g. iHerb (ships worldwide); in Singapore also Guardian, Watsons, GNC, Shopee / Lazada. Look for a third-party-tested / GMP mark and check the dose per serving.

Used in these protocols

Gut Health

Common questions

Does L-Glutamine actually work?

Human-evidence rating: 2 of 5. Situational gut-lining support.

How do you take L-Glutamine?

5–10 g/day.

Is L-Glutamine legal or approved?

Regulatory status: OTC Supplement.