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Inosine is a nucleoside, one of the basic compounds comprising cells.
It is a precursor to adenosine, an important energy molecule, and plays many supportive roles in the body, including releasing insulin , facilitating the use of carbohydrate by the heart, and, potentially, participating in oxygen metabolism and protein synthesis. Results of controlled studies have been disappointing, however, suggesting that inosine does not improve athletic performance and may even impair it. Inosine is found in brewer's yeast and organ meats. It is also available as a supplement. Inosine is not an essential nutrient, so deficiencies do not occur.