Effects of carnosine supplementation on physical endurance: a placebo-controlled randomized clinical trial.

backgroundCarnosine (β-alanine-L-histidine) is an endogenous dipeptide found in abundance in highly metabolic tissues such as skeletal muscle and the brain, where it is thought to play a role in intracellular buffering, and thereby, promote anaerobic glycolysis. Due to its perceived ability to support muscle energetics, carnosine, and its precursor, β-alanine, have found widespread use as performance-enhancing supplements. Nevertheless, the utility and efficacy of carnosine in enhancing physical performance have not been rigorously evaluated.

methodsWe conducted a placebo-controlled clinical trial in which 299 participants were randomized to consume either placebo or carnosine-containing capsules (2 g per day). Several assessments of physical performance (hand grip strength, bilateral calf raise, 2-min step test, gait speed) were measured before initiating supplementation (Baseline: Visit-2) and after approximately 6 week (Visit-3) and 12 week (Visit-4) of supplementation. At each clinical visit, blood and urine were also collected. For Visit-3 and Visit-4, absolute changes and percent changes from baseline were calculated for each physical function measurement.

resultsAt Visit-3 we observed a statistically significant (

conclusionsIn select age groups, carnosine supplementation improves muscular and cardiorespiratory endurance but not grip strength. The benefits appeared to be limited to males. Carnosine supplementation is likely to have beneficial effects in those undertaking short-term repetitive movements.