Methionine is an essential amino acid for all animals, but they do not produce it themselves, meaning they have to get it from their feed . DL-Methionine
is an essential amino acid containing sulphur.Methionine consists of an asymmetric carbon and exists as D(dextrogyre) and L(levogyre) optical isomers.
The L-methionine is considered as biologically active. The racemic mixture of D and L-isomers forms DL-methionine, which is the commercially available
DL-Methionine has been used to study its effect on the growth and feed utilization of Nile tilapia.
It has also been used as a part of standard diet in animal models.