Source Naturals - Pantothenic Acid Vitamin B-5 500 mg. - 200 Tablets Pantothenic Acid is a member of the B-vitamin family and is often referred to as vitamin B-5. Its bioactive form coenzyme A plays many roles in the body including the metabolism of proteins fats and carbohydrates the production of energy and the synthesis of red blood cells and the key neurotransmitter acetylcholine. Principles Source Naturals highest priority is their customers well-being.