Calcium D-pantothenate is a stable, synthetic form of vitamin B5. Supplement makers prefer it because it resists moisture and holds up better on the shelf than pure pantothenic acid. Each dose delivers both pantothenic acid and calcium. The body absorbs it well, about as efficiently as other B5 forms.
Your body needs pantothenic acid to build coenzyme A. That coenzyme sits at the center of energy metabolism, fat breakdown, and the creation of steroid hormones and neurotransmitters. People take this supplement to help with daily energy and stress response. True deficiency is uncommon. High doses of 1 to 2 grams a day have been used in targeted research settings, but those amounts are not standard for everyday use.