Histidine: Vital for growth and tissue repair, histidine is converted into histamine, a neurotransmitter essential for immune response, digestion, sexual function, and sleep-wake cycles.

Isoleucine: One of the branched-chain amino acids (BCAAs), isoleucine is pivotal in muscle metabolism and is heavily concentrated in muscle tissues.

Leucine: Also, leucine is a BCAA critical for protein synthesis and muscle repair. It also helps regulate blood sugar levels and stimulates wound healing.

Lysine: Important for calcium absorption and collagen formation, lysine plays a key role in producing antibodies, hormones, and enzymes.

Methionine: A precursor to cysteine and taurine, methionine assists in the metabolism and detoxification processes and is necessary for tissue growth and the absorption of zinc and selenium.

Phenylalanine: A precursor for tyrosine, dopamine, norepinephrine, and epinephrine, phenylalanine is essential for the structure and function of proteins and enzymes and the production of other amino acids.

Threonine: Threonine is a principal part of structural proteins such as collagen and elastin, which are important components of the skin and connective tissue, and plays a role in fat metabolism.

Tryptophan: Known for its role in the production of serotonin, tryptophan influences mood, sleep, and behaviour.

Valine: Another BCAA, valine stimulates muscle growth and regeneration and is involved in energy production.