Cholecalciferol | whatsinit

About

What it is and where it shows up.

Cholecalciferol (Vitamin D3) is the animal-derived form of vitamin D, naturally synthesized in human skin upon UV-B exposure and found in fatty fish, egg yolks, and liver; it plays an essential role in calcium and phosphorus homeostasis and bone mineralization. It is widely added to foods such as milk, edible oils, cereals, and dietary supplements globally to address widespread vitamin D deficiency.

Safety summary

The regulatory and scientific consensus.

Vitamin D3 is safe at recommended intake levels (adequate intake 15 µg/day for adults per EFSA); chronic excessive intake can cause hypercalcemia, soft-tissue calcification, hypercalciuria, and renal damage. EFSA established a tolerable upper intake level (UL) of 100 µg/day (4,000 IU/day) for adults, including pregnant and lactating women. Individuals with granulomatous diseases (e.g., sarcoidosis), pre-existing hypercalcemia, or chronic kidney disease are particularly susceptible to vitamin D3 toxicity even at moderate supplemental doses.

Regulatory landscape

What food-safety regulators have decided.

Jurisdiction	Status	Note
EFSA (European Food Safety Authority) (European Union)	Approved	Authorized as E671 in food supplements under Directive 2002/46/EC and in fortified foods under Regulation (EC) No 1925/2006. EFSA NDA Panel set a tolerable upper intake level (UL) of 100 µg/day for adults (including pregnant and lactating women) and a lower UL for children and infants. Adequate intake is 15 µg/day for persons over 1 year and 10 µg/day for infants 7–11 months. Simultaneous use of vitamin D2 and D3 in animal feed is prohibited per EU feed additive regulations.source
FSSAI (Food Safety and Standards Authority of India) (India)	Approved	Mandated for fortification of milk (0.5–2.0 µg/100 mL) and edible oil with Vitamins A and D under the Food Safety and Standards (Fortification of Foods) Regulations, 2016, as amended and notified in the Gazette of India on 09.08.2018. Vitamin D3 from lichen (Cladonia rangiferina, a plant-based source) is additionally permitted in nutraceutical products per a 2020 FSSAI notification, pending finalisation of amended nutraceutical regulations.source
FDA (Food and Drug Administration) (United States)	Approved	Authorized as a direct food additive under 21 CFR 172.380 for use in specific fortified foods (milk, flour, cereals, etc.); also recognized as GRAS under 21 CFR 184.1950 as a nutrient supplement. The Tolerable Upper Intake Level of 4,000 IU (100 µg = 0.1 mg)/day for adults is established by the IOM and referenced in FDA dietary guidance.source

Who should approach with care

Whose guidance would steer them away.

Kidney Disease — Impaired renal function reduces clearance of vitamin D metabolites and elevates the risk of hypercalcemia and soft-tissue calcification even at doses tolerated by healthy individuals, as noted in EFSA's tolerable upper intake assessments.

Other — Individuals with granulomatous diseases (e.g., sarcoidosis, tuberculosis) or primary hyperparathyroidism exhibit dysregulated vitamin D metabolism and are at high risk of hypercalcemia with supplemental Vitamin D3 intake.

Infants — EFSA sets a lower adequate intake of 10 µg/day for infants aged 7–11 months; exceeding age-appropriate doses can cause hypercalcemia and growth disturbances, and supplemental use requires paediatric guidance.

Children — Lower tolerable upper intake levels apply to children compared with adults per EFSA (2012); supplemental use should not exceed age-specific upper limits established in national and EU dietary guidelines.

Heart Disease — Excess Vitamin D3 can cause hypercalcemia, which may accelerate arterial calcification and potentially worsen cardiovascular outcomes in at-risk individuals, as flagged in EFSA safety assessments of excessive vitamin D intake.

Research citations

The sources behind this verdict.

1FDA. 21 CFR 172.380 – Vitamin D3 (Cholecalciferol). accessdata.fda.gov
2other. Vitamin D – Health Professional Fact Sheet. ods.od.nih.gov
3PubMed. Cholecalciferol (vitamin D3): efficacy, safety, and implications in public health. pmc.ncbi.nlm.nih.gov
4PubMed. Cholecalciferol (Vitamin D3) – StatPearls, 2024. ncbi.nlm.nih.gov
5EFSA. Scientific opinion on the tolerable upper intake level for vitamin D, including the derivation of a conversion factor for calcidiol monohydrate, 2023. efsa.europa.eu
6EFSA. Safety of Calcidiol Monohydrate Produced by Chemical Synthesis as a Novel Food pursuant to Regulation (EU) 2015/2283, 2021. efsa.europa.eu

Independently researched10 citations