L-Glutamine is the most abundant amino acid in the body. Despite widespread marketing, a meta-analysis (Ramezani Ahmadi et al., Clin Nutr 2019) of 25 RCTs found no effect on immune function, aerobic performance, or body composition in healthy athletes.
How should I track L-Glutamine powder?
L-Glutamine powder is high in protein. Supplement tracking comes down to two things: measuring the supplement itself and logging everything around it. For powders like L-Glutamine powder, a kitchen scale beats a scoop — scoops typically deliver 10–20% more than the stated serving (Almiron-Roig et al., Appetite 2013, found portion errors of 50–200% for dense foods). For capsules and tablets, count-based tracking is simpler but still matters at multiple daily doses. The real tracking trap is what you mix supplements with — milk, fruit, or nut butter can turn a 30-calorie serving into a 400-calorie shake. Log each ingredient separately for an accurate total.