What it is
Pantothenic acid (vitamin B-5) is a water-soluble vitamin that is a structural component of coenzyme A (CoA), one of the most important cofactors in cellular metabolism. CoA is essential for fatty acid synthesis and oxidation, the citric acid cycle, steroid hormone synthesis (including cortisol, aldosterone, and sex hormones), and neurotransmitter acetylation. The name "pantothenic" comes from the Greek "pantothen," meaning "from everywhere," because it is found in virtually all foods. Deficiency is extremely rare and has only been produced experimentally in humans.