Methionine is an essential amino acid.This means that its inclusion in the diet is necessary to avoid nutritional deficiencies. It belongs to the sulfured amino acid group, it is a precursor to cysteine, which is a component present in all protein tissues (organic tissue), it has antioxidant properties and prevents fat adhesion in arteries and the liver.

Its main purpose is to synthesize protective tissue (hairs, bristles, feathers, beak, nails, scales, etc.). Because of this, its supply is essential during early stages.