Inosine appears to inhibit the production of pro-inflammatory cytokines without inhibiting anti-inflammatory cytokines. It appears to do so extracellularly, although the effect can be reversed by the blockading of adenosine receptors. Optimal Stack However, it is a convenient way of avoiding this sometimes serious condition, which is a natural function of the immune system, without affecting any other part of that system's essential work. It is not an essential nutrient, since it is synthesized biochemically, but a supplement of inosine is certainly worth taking if you want to increase your ability to carry out athetic exercise requiring a high energy output and increased blood oxygen availability. It also helps to reduce recovery time, and proponents of its use claim that it enables you to exercise at a higher level for longer.http://www.healthcaresup.com/optimal-stack/