A nutrient needed for calcium balance and healthy bones, supplied as vitamin D2 or D3 in foods and supplements.
Purpose, evidence and practical considerations.
Clinical recommendations differ for children, pregnancy, older adults and people with an established indication for treatment. Routine testing or extra supplementation is not required for every healthy adult.
Correcting deficiency is established care. The Endocrine Society’s 2024 guidance advises against routinely exceeding recommended nutrient intakes in generally healthy adults under 75. This prevention guidance does not apply to people with a separate clinical need for vitamin D treatment.
Confidence: strong
Chronic excess can cause hypercalcemia, kidney stones, kidney injury and soft-tissue calcification. The US adult upper limit is 4,000 IU/day for routine unsupervised intake; 5,000 IU/day exceeds it and merits individualized laboratory and clinician review.
A report of “vitamin D” does not identify D2, D3 or a particular product. Nutrient adequacy, treatment of deficiency and attempts to prevent unrelated disease are separate questions.
Regulatory status: essential nutrient and dietary supplement ingredient
The evidence on this page does not automatically apply to:
How people use it, with their schedules, context and original sources.
vitamin D receptors on skeletal muscle; falls in geriatrics
5,000 IU · Daily
evidence is weak but he judged the downside risk "insanely low"
daily in the January 2024 list
~2,000 IU · Daily · after dinner
~5,000 IU · Daily
to make sure he gets enough vitamin D and K2
Amount and timing patterns reported in public protocols; these are observations, not instructions. Private and hidden usage is excluded.
daily
Vitamin D is listed as an ingredient or component in these reviewed interventions.
These share a protocol with this intervention. This does not establish that they work together or are suitable alternatives.