Epicatechin for Exercise Performance

Research suggests that epicatechin shows promising effects on exercise performance and muscle physiology in animal studies, where it has been associated with improved endurance, mitochondrial biogenesis, muscle fatigue resistance, and angiogenesis, with one mouse study reporting roughly a 50% increase in treadmill performance. However, human evidence is considerably more mixed and limited, with a randomized controlled trial in trained cyclists and additional controlled experiments finding no meaningful improvements in vasodilation, high-intensity exercise performance, or endurance markers following epicatechin or cocoa flavanol supplementation. A 2021 systematic review of nutritional interventions in CrossFit athletes similarly found no performance benefit from epicatechin, and a rat study in healthy animals reported only modest blood pressure reductions without improvements in exercise capacity. Overall, the body of evidence spans reviews, animal studies, and a small number of human trials, most of which involve small sample sizes and short intervention periods, making it difficult to draw firm conclusions about epicatechin's practical utility as an ergogenic aid in humans.