What Are Essential Amino Acids Supplements? Essential amino acids supplements (EAA) contain amino acids that are essential for bodily function but must be acquired through the diet. Amino acids are carbon-containing molecules that are the building blocks of protein; they form chains that become protein molecules. Proteins provide structure to all cells, especially those found in muscle tissue, and play a role in growth, repairing tissue, building muscle, moving nutrients, initiating chemical processes, and preventing illness. Essential Amino Acids Supplements Benefits † Essential amino acids supplements have many benefits because essential amino acids are involved in nearly every chemical process in the body. Of the 20 amino acids, nine cannot be produced by the body and are essential to human health, boosting athletic performance and general well-being. Essential amino acids are the primary performance supplement for building strength, promoting healthy metabolism, and supporting connective tissue. Increase energy Builds muscle & strength Boosts metabolism & weight loss Improves appetite control Helps regulate digestion Fortifies connective tissue & supports the immune system