Creatine vs. Creatinine

Creatinenoun

(amino acid) An amino acid, 2-(carbamimidoyl-methyl- amino)acetic acid, which naturally occurs in vertebrates and helps to supply energy to muscle and nerve cells.

Creatinenoun

an amino acid that does not occur in proteins but is found in the muscle tissue of vertebrates both in the free form and as phosphocreatine; supplies energy for muscle contraction

Creatine

Creatine ( or ) is an organic compound with the nominal formula (H2N)(HN)CN(CH3)CH2CO2H. This species exists in various modifications (tautomers) in solution. Creatine is found in vertebrates where it facilitates recycling of adenosine triphosphate (ATP), the energy currency of the cell, primarily in muscle and brain tissue.

Creatininenoun

(biochemistry) A heterocyclic amine, 2-amino-1-methyl-5H-imidazol-4-one, formed by the metabolism of creatine.

Creatinine

Creatinine ( or ; from Greek: κρέας, romanized: kreas, lit. 'flesh') is a breakdown product of creatine phosphate from muscle and protein metabolism. It is released at a constant rate by the body (depending on muscle mass).