The invention relates to a mixture, wherein the mixture contains ribose, alanine and glycine. The mixture furthermore can contain glutamine and one or more of the following substances: valine, leucine, isoleucine, 5-hydroxy-tryptophan, tryptophan, cysteine, serine. Alternatively or in addition, the mixture furthermore can contain asparagine, arginine, proline and lysine. The invention furthermore relates to a mixture which contains ribose, glycine, proline, lysine, arginine and asparagine.