Metabolically, inosine is an intermediate in a number of purine nucleotide pathways that affect the ability of the muscle to work efficiently.* Some fitness experts claim that inosine can have a positive effect on overall physical strength and energy during exercise. Inosine is the perfect training companion. It is a natural substance that can help increase the body's ability to carry oxygen, without effecting its uptake in the lungs, so it can work harder, stronger. Inosine is the perfect training companion.