PANTETHINE B5 Equimolar Pantethine/Pantothenic Acid (60t) Pantethine is the biological active, intermediate form of pantothenic acid (Vitamin B-5) precursor of Co-Enzyme A, which regulates an important step in cholesterol homeostasis. Also known as vitamin B-5, substance is an important cofactor in metabolic pathways as diverse as the release of energy from carbohydrates, the synthesis and breakdown of fatty acids, and the metabolism of such vital substances as sterols and steroid hormones, porphyrins and acetylcholine.