“…Another essential amino acid, methionine had been linked to cellular functions such as methylation reactions, polyamine synthesis, folate coupling metabolism and redox maintenance (Sanderson, Gao, Dai, & Locasale, 2019). Lysine had also been found to be useful for treatment of stress and anxiety using animal models due to their modulatory effects on neurotransmitter systems such as gamma-aminobutyric acid (GABA) and serotonin (Camfield, 2017). Threonine is linked to the synthesis of mucin lining along the intestines which prevents the absorption of allergy-provoking proteins that are incompletely digested (Faure et al, 2005).…”