Glutamine 4K is a product from UK based company Applied Nutrition. This product states that it can restore the amino acids within the muscle that get depleted during exercise. This review will aim to examine the ingredients in this product to see if it can support the claims made.

L – Glutamine

L – 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.

This product contains ingredients that can help to restore amino acids within the muscle that are reduced during workout. This product should be consumed post workout. This product has no banned substances when referring 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.