Reflex Nutrition L-Glutamine Review

L-Glutamine is a sports supplement produced by UK based brand, Reflex Nutrition. This supplement is said to improve endurance and improve training. This review will asses the ingredients listed within this supplement to identify whether these claims can be backed up.



Glutamine is a naturally non-essential neutral amino acid that helps with the transport of nitrogen between tissues. Heavy exercise has shown a reduction of glutamine in the blood (1). The amount of glutamine in the muscle is known to be related to the rate of protein synthesis (2) and glycogen synthesis (3) in the first few hours of recovery period of exercise.


L-Glutamine  (the ingredient) can be used by people who want to increase muscle mass. An advantage of this supplement is that it has only one ingredient which means that it doesn’t compete with any other vitamins to be metabolised by the body. This supplement is best taken post-workout. This product has no banned substances in reference to the WADA prohibited list when observing the label / ingredients posted on the website..

*NOTE – This product has not been tested in a laboratory and may contain other substances that may not appear on the label


1 – Parry-Billings, M., Budgett, R., Koutedakis, Y., Blomstrand, E., Brooks, S.., Williams, C.,  & Newsholme, E. A. (1992). Plasma amino acid concentrations in the overtraining syndrome: possible effects on the immune system. Medicine and science in sports and exercise, 24(12), 1353-1358.

2 – Rennie, M. J., Edwards, R. H. T., Krywawych, S., Davies, C. T., Halliday, D., Waterlow, J. C., & Millward, D. J. (1981). Effect of exercise on protein turnover in man. Clin Sci, 61(5), 627-639.

3 – Bowtell, J. L., Gelly, K., Jackman, M. L., Patel, A., Simeoni, M., & Rennie, M. J. (1999). Effect of oral glutamine on whole body carbohydrate storage during recovery from exhaustive exercise. Journal of Applied Physiology, 86(6), 1770-1777.

Use for  Endurance
Price  £21