Category: Muscle metabolism

Over 90% of the body's stored energy is in the form of triglycerides within adipose tissue, but a significant and readily accessible portion is also stored directly within muscle fibers. This fuel depot, known as intramuscular triglycerides (IMTGs), is a crucial energy source during prolonged exercise, with its usage varying based on exercise intensity, duration, and an individual's training status.

While anecdotal evidence suggests L-citrulline boosts energy, a significant 2019 study published in the *Journal of Cachexia, Sarcopenia and Muscle* found that it does not increase overall cellular energy status or respiration. Instead, it functions in a more sophisticated way to optimize energy use and performance, raising the complex question of, **does L-citrulline increase ATP**?