Vitamins
Vitamin D3
Vitamin D3, also called cholecalciferol, is one form of vitamin D. This page is about D3, not every vitamin D label.
Vitamin D
Vitamin D is a nutrient people get from food, sunlight, and supplements. A supplement label uses one of two forms, D2 (ergocalciferol) or D3 (cholecalciferol). This page is about vitamin D in general. The separate Vitamin D3 page is about that one form only.
Vitamin A
Vitamin A is a fat-soluble vitamin in many foods. Retinol is a form of preformed vitamin A. Supplement labels more often list retinyl acetate or retinyl palmitate, which are also preformed vitamin A. Beta-carotene is provitamin A: the body can turn it into vitamin A. A product whose name says beta-carotene is that provitamin A form, not preformed vitamin A.
Vitamin C
Vitamin C, also called ascorbic acid, is a vitamin the body uses to make collagen and to support immune function. This page is about the vitamin in food and in supplements you swallow.
Vitamin B1
Vitamin B1, also called thiamin, helps turn food into energy and is used in cell growth and function. This page is about thiamin in food and in supplements.
Vitamin B2
Vitamin B2, also called riboflavin, is used in cell growth and function and helps turn food into energy. This page is about riboflavin in food and in supplements.
Vitamin B3
Vitamin B3, also called niacin, helps turn food into energy and is used in cell development and function. Supplement labels use nicotinic acid or nicotinamide. Those are two forms, not two results.
Vitamin B5
Vitamin B5, also called pantothenic acid, helps turn food into energy and is used in making and breaking down fats. It is present in almost all foods.
Vitamin B6
Vitamin B6 is used in more than 100 enzyme reactions in metabolism, and in immune function. Supplement labels usually say pyridoxine.
Vitamin B12
Vitamin B12 is a vitamin used in red blood cells and in nerve function. Shoppers often search for it as B12.
Biotin
Biotin is vitamin B7.
Vitamin B9
Vitamin B9 is folate, a B vitamin used to make DNA and to help cells divide. Folic acid is the form in fortified foods and in most supplements. Food folate and folic acid are not the same amount on a label.
Vitamin E
Vitamin E is a vitamin that acts as an antioxidant. The form on most supplement labels is alpha-tocopherol.
Vitamin K
Vitamin K is a nutrient used in blood clotting and in bones. Supplement labels use vitamin K1 (phylloquinone or phytonadione) or vitamin K2 (menaquinones). This page is about vitamin K in general. It is not a separate page for K1 or for K2.