Glycine Glycine is a non-essential amino acid that has one of the simplest structures of all the amino acids. Glycine is found in proteins of all life forms, and is important in the synthesis of proteins as well as adenosine triphosphate (ATP).* 500 mg Capsule Option Available: 100, 200 Suggested Use: 2 capsules 1 to 2 times daily. Allergies: Contains no yeast, dairy, egg, gluten, corn, soy or wheat. Contains no sugar, starch, salt, preservatives, or artificial color, flavor or fragrance.