Vitamin D
This is what the ingredient is.
Vitamin D3 (cholecalciferol) is a fat-soluble vitamin naturally produced in skin upon sun exposure. Also found in fatty fish. Synthetically produced for fortification.
Here is why it shows up on the label.
Nutrient fortification in milk, orange juice, cereals, and supplements. Essential for calcium absorption, bone health, and immune function.
Here is what food agencies say.
The FDA has approved it for fortification with specific limits by food type. RDA: 600-800 IU/day. Upper limit: 4000 IU/day. Approved globally.
Here is what research has found.
Essential for bone health - prevents rickets in children and osteomalacia in adults. Deficiency very common globally. Studies examine role in immune function and chronic disease prevention.
Here are a few things worth knowing.
Food fortification amounts are safe. Very high supplemental doses (>10,000 IU/day long-term) can cause vitamin D toxicity (hypercalcemia). Fortification is important public health measure for preventing deficiency.
Sources
- FDA Fortification Limits
- NIH Vitamin D Fact Sheet
- Endocrine Society Guidelines 2011
How to read this page
We publish plain facts about this ingredient so a label is easier to read. This is not medical advice, and it is not a recommendation to buy, avoid, or use anything. For a personal health question, talk with a clinician who knows your history.