About Vitamin D
Vitamin D is a fat-soluble prohormone primarily synthesised in skin on exposure to UVB sunlight. It regulates calcium and phosphorus absorption, is essential for bone mineralisation, supports immune function, and influences hundreds of genes. In the UK, sunlight exposure is insufficient for synthesis from October to March — supplementation (10 µg/day) is recommended for everyone. UV-exposed mushrooms are the only meaningful plant food source.
Rickets in children (soft, deformed bones); osteomalacia in adults (bone pain, muscle weakness). Subclinical deficiency is extremely common in the UK and associated with increased susceptibility to infections, low mood, and poor muscle function.
From food or sunlight alone, toxicity is essentially impossible. Supplement overdose (typically >100 µg/day long-term) causes hypercalcaemia — nausea, weakness, kidney damage, and calcification of soft tissues. Upper limit 100 µg/day for adults.
Daily Reference Intake
per European Regulation 1169/2011
= 85% of daily NRV
used in our database
Foods Containing Vitamin D
916 foods with recorded data, ranked highest first. Showing 1–100 of 916. Values per 100g fresh weight.
* Values are per 100g fresh weight. % NRV = percentage of EU Nutrient Reference Value. Bar shows relative level compared to the highest value across all foods in the database.