L-Glutamine

Amino Acid

Most-abundant amino in the body, popular for gut healing and immune support during heavy training. Muscle-building claims are largely overstated.

gut-healthimmunerecoveryintestinal-barrier

Typical dose

5–15 g daily

Evidence

Limited (small studies)

Onset time

Cumulative: 1–4 weeks

Half-life

~1 hour

Forms

Powder, Capsule

Source

microbial

Best taken with

water, empty stomach

Best time of day

morning

Bioavailability

4/5

Safety rating

5/5

Price per serving

$0.40

Vegan / GF / 3rd-party

✓ / ✓ / ✓

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Vetted brands, third-party testing, ships worldwide.

Common uses

• Leaky gut support
• Immune during overtraining
• Wound healing

Effect profile

Strength

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Muscle

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Energy

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Focus

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Mood

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Sleep

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Immunity

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Recovery

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Longevity

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Common side effects

• Mild GI upset (rare)

Avoid if

• Liver disease
• Reye's syndrome

Drug interactions

• Anti-seizure meds

Related amino acid supplements

L-Glutamine vs BCAA L-Glutamine vs Essential Amino Acids (EAA)L-Glutamine vs L-Arginine L-Glutamine vs L-Citrulline

Medical disclaimer

SupplementDuel is for educational purposes only and is not medical advice. Consult a physician before starting, stopping, or combining supplements.