What does cholecalciferol mean?
Cholecalciferol is the chemical name for vitamin D3, a fat-soluble compound essential to human health. It is synthesized naturally in the skin when ultraviolet B radiation converts a form of cholesterol into the vitamin, after which the liver and kidneys transform it into its active hormonal form, calcitriol. That active form regulates the absorption of calcium and phosphate in the gut, making cholecalciferol central to bone strength and to the prevention of rickets in children and osteomalacia in adults. Because sunlight exposure varies with latitude, season, and lifestyle, cholecalciferol is widely added to foods such as milk and sold as a dietary supplement, typically in capsules or drops. The word belongs mainly to medical, nutritional, and scientific register; ordinary speakers simply say vitamin D3, while clinicians, researchers, and product labels use the precise chemical name.
nounA fat-soluble vitamin (vitamin D3) produced naturally in the skin when exposed to ultraviolet light, and taken as a dietary supplement to aid calcium absorption and maintain healthy bones.
- Vitamin D3: a fat-soluble sterol synthesized in the vertebrate skin from 7-dehydrocholesterol under UVB light, functioning as a hormone precursor that regulates calcium and phosphate metabolism; also used as a dietary supplement and food fortificant.
"The doctor prescribed a weekly dose of cholecalciferol to correct the patient's vitamin D deficiency."
"Milk is commonly fortified with cholecalciferol to help prevent rickets in children."
"Because the body synthesizes cholecalciferol when skin is exposed to sunlight, levels often drop during winter months at high latitudes."
Rarely pluralized; the word normally functions as an uncountable mass noun referring to a single substance.
"Different commercial preparations contain cholecalciferols of varying purity."
Your body makes cholecalciferol for free — all it needs is about ten minutes of sunshine.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of cholecalciferol
The name was coined in the early twentieth century from Greek and Latin roots: "chole-" comes from the Greek kholē meaning bile or gall (the same root seen in cholesterol), reflecting the compound's derivation from cholesterol, combined with "calciferol," formed from Latin calx (lime) plus ferre (to carry), describing its role in carrying calcium. It entered English scientific vocabulary alongside the other D vitamins discovered during research into anti-rachitic substances in the 1920s and 1930s.
How cholecalciferol is actually used
A technical term used chiefly in medicine, nutrition science, pharmacology, and food-labelling contexts. In everyday speech people say "vitamin D3" instead; "cholecalciferol" appears most often on supplement labels, clinical guidelines, and scientific literature.
Easily confused with cholecalciferol
Ergocalciferol is vitamin D2, derived from plant or fungal sources, whereas cholecalciferol is vitamin D3, made by animals in response to sunlight.