Greatly improved stability over the L-glutamine supplement, L-glutamine is an essential amino acid and a key component of culture media, serving as a major energy source for propagating cells.  It is very stable as a dry powder and as frozen solution but degrades rapidly in liquid media or stock solutions, producing toxin compounds.  Optimal cell performance usually requires supplementation of the media with L-glutamine prior to use.  L-alanyl-L-glutamine is a stabilized dipeptide form of L-glutamine which does not degrade in liquid media during storage or incubation, providing superior results in several applications. Greatly improved stability over the L-glutamine supplement, L-glutamine is an essential amino acid and a key component of culture media, serving as a major energy source for propagating cells.  It is very stable as a dry powder and as frozen solution but degrades rapidly in liquid media or stock solutions, producing toxin compounds.  Optimal cell performance usually requires supplementation of the media with L-glutamine prior to use.  L-alanyl-L-glutamine is a stabilized dipeptide form of L-glutamine which does not degrade in liquid media during storage or incubation, providing superior results in several applications.