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Research library/Vitamin D
General Health · Ingredient guide

Vitamin D

A fat-soluble vitamin involved in bone health, calcium regulation, and immune function.

Compare
Evidence strengthStrong evidence
Based on consistency, quality and relevance of human research—not podcast mentions.
Common research protocol1,000–2,000 IU daily commonly studied
Protocols mapped2 goal-specific protocols
Evidence reviewed throughSeptember 2026
Evidence verdict

Strong for preventing or correcting deficiency and supporting bone health. Broad disease-prevention claims in healthy adults under 75 are not supported by current guideline evidence.

Scientific evidence1 reviewed sourceDetermines the evidence grade
Expert & media context0 reviewed sourcesDoes not change the grade alone
01

What it is & primary uses

A fat-soluble vitamin involved in bone health, calcium regulation, and immune function.

Deficiency correctionBone healthVitamin D status
02

Main benefits

  • Supports bone health
  • Corrects inadequate vitamin D status
03

Studied protocols

Research doses are grouped by outcome. They describe study designs—not a personal prescription.

Meet usual intake

600–800 IU/day total intake

High confidence
Study duration
Daily
Interpretation
General dietary reference range; needs vary by age and established indication.
Documented deficiency

Lab- and clinician-guided

High confidence
Study duration
Recheck based on clinical plan
Interpretation
Deficiency treatment is not appropriately reduced to one universal supplement dose.

Clinical or experimental context—professional guidance is especially appropriate.

04Food sources & equivalents
Food sources & equivalents

Can food provide a studied amount?

Practical food match
Comparison target600–800 IU/day total intake

Fatty fish is one of the few naturally rich food sources; fortified milk can contribute smaller amounts.

Cooked sockeye salmon~90–120 g

Approximately 600–800 IU vitamin D based on 570 IU per 85 g

Fortified milk~5–6⅔ cups

Approximately 600–800 IU at about 120 IU per cup

How this was estimated
Serving amount scales from the NIH food table. Fortification varies, so check the label.
Important limitation
This compares total intake with a dietary reference range—not treatment of deficiency. Deficiency dosing depends on testing and clinical context.

Food equivalents compare ingredient mass using published composition values. They do not prove equal absorption, formulation, physiological effect, safety or personal need.

Source: NIH ODS: vitamin D food sources ↗
05How to take it for absorption & tolerance
Meal relationship

With dietary fat

Evidence-informed
A meal containing fat improves absorption of this fat-soluble vitamin.

Vitamin D absorption is enhanced by dietary fat, and taking it with the largest meal improved blood levels in a clinical cohort.

Practical approach
Take it with a consistent main meal containing some fat.
Watch for
Meal timing does not replace testing or clinician-directed treatment of deficiency.

Meal guidance reflects human pharmacokinetic, clinical, official-label or evidence-review sources where available. A food pairing can change absorption or tolerability, but does not make a supplement necessary, effective or safe for every person.

Source: Taking vitamin D with the largest meal improves absorption ↗
06Supplement interaction check
Library interaction context156 ingredients · 0 mapped signals for this guide

An unlisted pair means no established pair-specific interaction was identified in this review—not proof that every dose, product or person is safe.

No pair-specific signal listedNo established interaction with another Dose Radar ingredient was identified in this review.

This is not proof that every dose, product or user context is safe. Medication and condition checks still apply.

07Research notes
Evidence verdict

Strong for preventing or correcting deficiency and supporting bone health. Broad disease-prevention claims in healthy adults under 75 are not supported by current guideline evidence.

The appropriate amount depends on baseline status, sun exposure, diet, and clinician-directed testing.

TimingWith a meal containing fat
Time to expected effect8–12 weeks for blood-level changes
08Scientific references
Evidence sourceUsed to assess efficacy, protocols and confidence

Peer-reviewed human research and formal evidence reviews. Open each source to inspect the complete paper record.

Scientific evidence2024Clinical practice guideline↗ PubMed

Vitamin D for the prevention of disease: Endocrine Society guideline

Dose context: Empiric supplementation versus established indications

Suggests against routine supplementation above dietary reference intake for disease prevention in healthy adults under 75; deficiency treatment is a separate clinical context.

09Expert & media references
Context sourceUsed to understand what professionals discuss

Podcast and practitioner statements are clearly separated from research. They may explain practice or emerging ideas, but do not prove efficacy.

0 reviewed context sourcesNo verified expert or media reference mapped yet.

Dose Radar will leave this lane empty rather than invent or infer a professional opinion.