These amino acids are essential and must be ingested through diet or supplementation. Each essential amino acid has a unique function in the body.
Lysine plays an important role in building muscle, maintaining bone strength, supporting recovery after injury and surgery, regulating hormones, antibodies for a healthy immune response and enzymes. Histidine supports blood cell growth, formation, and tissue repair. It also helps maintain a special protective cover called the myelin sheath that covers nerve cells. Threonine is a part of tooth enamel, collagen and elastin, so it is necessary for healthy skin and teeth. It helps support fat metabolism and can be beneficial to people with indigestion, anxiety and mood balance concerns. Methionine and the non-essential amino acid cysteine play a critical role in skin, hair and nail health. It supports the absorption of selenium and zinc and the removal of heavy metals lead and mercury. Valine is important for mental concentration, muscle coordination and emotional wellbeing. It can also be used for muscle growth, tissue repair and energy support. Isoleucine is important for wound healing, immune health, blood sugar control and hormone production. It is found primarily in muscle tissue and regulates energy levels. Leucine helps regulate blood sugar levels and helps muscle, bone growth and repair. It is also needed to heal wounds and support growth hormone production. Phenylalanine helps the body use other amino acids, proteins and enzymes. The body converts phenylalanine to tyrosine. This is required for specific brain functions. It can also lead to eczema, malaise and memory loss. Tryptophan is a precursor of serotonin and melatonin. Appetite, sleep, emotional health and pain perception are all regulated by serotonin, while melatonin helps to regulate sleep.