L Thryptophan is an essential amino acid that plays a central role in several physiological functions in animals. This is, therefore, used as a supplement to be sure that animals get an adequate amount of this essential amino acid, especially in cases where the formulation of natural feed ingredients may not meet their needs. It enhances feed conversion since animals convert more feed into muscle mass. Being a precursor to serotonin synthesis, L-Tryptophan has come in handy in stress and welfare improvement in the animal, thus a valuable tool towards productivity and behavior in livestock farming and animal husbandry. It is an essential amino acid used by animals in the formation of proteins thus growth, behavior, and general health of animals.