Methionine is an essential amino acid that plays a critical role in many biological processes, especially as a methyl donor in the body. Its relationship with homocysteine, a sulfur-containing amino acid linked to cardiovascular health, has attracted significant scientific interest.

Methylation is a very small, foundational chemical function in your body. It involves the moving of a methyl group, which is a carbon with three hydrogens that you can picture a lot like a Mickey Mouse head with an extra ear (shudder).