D-calcium pantothenate is a form of vitamin B5, also known as pantothenic acid, that is commonly added to dietary supplements and fortified foods. Pantothenic acid is essential for the metabolism of proteins, carbohydrates, and fats in the body. D-calcium pantothenate is often used in protein powders as a source of pantothenic acid, which is necessary for the conversion of food into energy.
D-calcium pantothenate is generally considered safe when used in recommended amounts, although high doses may cause diarrhea and gastrointestinal discomfort. People with kidney disease should avoid taking high doses of vitamin B5 supplements.