Life Extension L-Glutamine, 500mg, 100 capsules


L-glutamine is a “conditionally essential” amino acid which plays important roles in immune function and tissue repair.1, 6 L-glutamine can also cross the blood brain barrier, and can be (safely) converted to the neurotransmitters glutamate and GABA in the brain.2 Unlike glutamate ingestion (e.g. MSG), the conversion of L-glutamine to glutamate is highly regulated, so the likelihood of side effects is negligible.2 L-glutamine supplementation helps support immune function, tissue repair (including from exercise), and may help with cognitive performance.3, 4, 5, 6

500mg capsules – 100 count

Take 1 – 3 per day or as needed.

1 in stock

Categories: ,


Full ingredient list: l-glutamine 500mg per capsule. Also includes: vegetable cellulose (capsule), silica, vegetable stearate.

To report a serious adverse event or obtain product information, contact 1-866-280-2852.


1. 1. Gropper, S. A. S., Groff, J. L., & Smith, J. L. (2009). Advanced nutrition and human metabolism. Belmont, CA: Wadsworth, Cengage Learning, pp 222-223.

2. Nelson, D. L., & Cox, M. M. (2008). Lehninger Principles of Biochemistry (5th ed.). New York, New York: W. H. Freemam, pp 857-862, 878.

3. Burke DJ, Alverdy JC, Aoys E, Moss GS. Glutamine-supplemented total parenteral nutrition improves gut immune function. Archives of surgery (Chicago, IL). 1989; 124(12):1396-9. [pubmed]

4. Walsh, N.P., Blannin, A.K., Robson, P.J. et al. Glutamine, Exercise and Immune Function. Sports Med 26, 177–191 (1998).

5. Gabriel J. Pruna, Jay R. Hoffman, William P. McCormack, Adam R. Jajtner, Jeremy R. Townsend, Jonathan D. Bohner, Michael B. La Monica, Adam J. Wells, Jeffrey R. Stout, Maren S. Fragala & David H. Fukuda (2016) Effect of acute L-Alanyl-L-Glutamine and electrolyte ingestion on cognitive function and reaction time following endurance exercise, European Journal of Sport Science, 16:1, 72-79.

6. Douglas W. Wilmore, The Effect of Glutamine Supplementation in Patients Following Elective Surgery and Accidental Injury, The Journal of Nutrition, Volume 131, Issue 9, September 2001, Pages 2543S–2549S.

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