L-carnitine L-tartrate supplementation promotes recovery after exercise with as little as 1 gram, according to studies. Carnitine's capacity to promote nitric oxide (NO) synthesis and blood flow to recovered muscles, as well as its ability to increase muscular oxygen consumption, are likely responsible for the enhanced recovery. L-carnitine L-tartrate raises the number of androgen receptors in muscle cells, which is an additional advantage. These are the receptors within muscle fibers to which testosterone binds to stimulate muscular development