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Medical Definition of calcium pantothenate. : a white powdery salt C18H32CaN2O10 made synthetically and used as a source of pantothenic acid.
Pantothenic acid, also called vitamin B5, is an antioxidant water-soluble vitamin needed to break down carbohydrates, proteins, and fats. Pantothenic acid comes in three forms, and it is alternately known as vitamin B5, panthenol and calcium pantothenate.antothenic acid is not known to be toxic in humans. No serious side effects have been reported, even at intakes of up to 10,000 mg (10 grams) per day. Very large amounts of pantothenic acid (several grams per day) can cause diarrhea. Doses of 10 grams (10,000 mg) or more a day can result in diarrhea.