In biological terms, methylation involves installing a chemical group, called methyl group, onto an existing molecule with the help of enzymes. Methylation is involved in a variety of different biological processes, one of which is regulation of expression of genes and regulation of protein function.
Many methylation processes in our body are governed by enzymes which are heavily dependent upon the B vitamins. A problem with B vitamin metabolism can create different health problems. Through analyses of genes that function in methylation processes, it is easy for us to understand which B vitamin is deficient. Accordingly, the correct supplement of that particular B vitamin can be given to the individual to fulfil the nutritional requirement.