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Vitamin D (ergocalciferol-D2, cholecalciferol-D3, alfacalcidol) is a fat-soluble vitamin that helps your body absorb calcium and phosphorus. Having the right amount of vitamin D, calcium, and phosphorus is important for building and keeping strong bones.
Knowledge center. Vitamin B3, also known as Niacin, vitamin PP, and nicotinic acid, is one of eight B vitamins. Niacin helps the food we eat turn into energy-it also plays a role in maintaining our skin and nerves healthy.itamin B 3 is a water-soluble vitamin-meaning that it dissolves in water-with pellagra-curative, antilipemic, and vasodilating properties, according to PubChem. 1.