Too much use of lysine particularly as a complement has been linked to stomach discomfort and diarrhoea.

Methylation been found on a spread of lysine residues in various histones: K4 (utilizing the only-letter amino-acid code for lysine), K9, K27, K36 and K79 in histone H3, K20 in histone H4, K59 in the globular area of histone H4 2 and K26 of histone H1B three A number of proteins answerable for the methylation of particular residues have been characterised, and all but considered one of these contains a SET domain