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Vitamin D

Vitamin D is vitamin d3 (cholecalciferol) or d2 (ergocalciferol). It is used in supplements positioned for bone; muscle; immune, although evidence strength and legally permitted claims depend on the exact form, dose and jurisdiction.

Bone health
Immune system
Metabolism

Origin of Ingredient

skin UV synthesis, oily fish and fungi; supplements derive from lanolin, algae/lichen or yeast

History of Ingredient

Vitamin D became established through modern nutrition and deficiency research, particularly during the 19th and 20th centuries. Supplement forms were subsequently developed to provide consistent, measurable nutrient intake.

Scientific Makeup of Ingredient

secosteroid converted to calcitriol hormone

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