Double Wood Supplements' Essential Amino Acid capsules contain all 9 essential amino acids (including all 3 branched-chain amino acids) in the following amounts per serving: L- Leucine 205mg, L-Lysine 185mg, L-Threonine 141mg, L-Valine, 141mg, L-Isoleucine 115mg, L-Phenylalanine 72mg, L-Histidine 37mg, L-Tryptophan 37mg, L-Methionine 35mg. Essential Aminos are required for many processes in the body such as protein synthesis and neurotransmitter synthesis. They also supply your body with the raw material it needs maintain and build muscle mass. Supplementing with essential amino acids is vital for achieving optimum nutrition in your diet and supporting energy levels on a day to day basis. Double Wood's Essential Amino Acid Capsules are Made / Tested in the USA, Non-GMO and Gluten Free.