Amino Acid Glycine

Amino acid glycine is a protein amino acid that can be found in the protein of all life forms and is important in the body’s construction of proteins. Amino acid Glycine is the simplest amino acid in the body that is not optically active. In contrast to other amino acids, glycine stays the most common amino acid found in both enzymes and proteins. Although most amino acid glycine is found in proteins, free glycine is found in body fluids as well as in plants. It is estimated that the normal diet contributes two grams of glycine daily.


Since amino acid glycine can be sufficiently produced by the body to meet physiological requirements, it is considered a nonessential amino acid. However, it is of key importance in the synthesis of proteins, purines, peptides, nucleic acids, porphyrins, hemoglobin, creatine, glucose, one-carbon fragments, L-serine, adenosine triphosphate (ATP), and other amino acids.


Amino acid Glycine performs as an inhibitory neurotransmitter in the brain and spinal cord. It plays vital roles in the method of prevention for muscular degeneration, repair of damaged tissues located throughout the body, and improvement of glycogen storage. Glycine is an important amino acid because if needed, it will synthesize and convert from serine and threonine to fulfill its physiological processes.


Glycine is a solid water-soluble substance that has a sweetish taste and is also known as amino acetic acid, glycocoll, sucre de gelatine, and aminoethanolic acid. Its one-letter abbreviation when spelling out protein structures is G and its IUPAC abbreviation is Gly.


Glycine can also be found in natural food sources. Natural food sources containing high amounts of glycine includes fish, beans, dairy products, and meats. Here are food sources of glycine that are based on a serving size of 100 g and the amount of glycine contained is

expressed in milligrams:

Vegetable Products
Seaweed, spirulina (dried) 3100 mg

Nut and Seed Products
Seeds, cottonseed meal (partially defatted, glandless) 2380 mg
Seeds, sunflower seed flour (partially defatted) 3080 mg
Seeds, sesame flour (low-fat) 3430 mg
Seeds, pumpkin and squash seed kernels (roasted without salt) 2410 mg

Legume Products
Soy protein concentrate (produced by alcohol extraction) 2690 mg
Peanut flour (defatted) 3150 mg
Soy protein isolate (potassium type) 3600mg
Soy protein concentrate (produced by acid wash) 2690 mg
Soy protein isolate 3600 mg

Shellfish and Finfish Products
Fish, cod, Atlantic (dried and salted) 3010 mg