Related Compounds
Compounds connected by the same goals, effects, or research topics.
Compound Profile
Vitamin D
Bone health; immune support when deficient; safety screen: hypercalcemia; sarcoidosis; high dose use without labs.
Use extra caution — Safety evidence: excessive vitamin D can cause persistent hypercalcemia or hypercalciuria; risk depends on dose, duration, calcium intake, disease context, and measured vitamin D and calcium status. Details
Last reviewed: •3 sources citedReport a correctionProfile-wide ·D Preliminary
At a glance
From this profile's structured data- Evidence
- Grade D
- Safety
- Safety evidence: excessive vitamin D can cause persistent hypercalcemia or hypercalciuria; risk depends on dose, duration, calcium intake, disease context, and measured vitamin D and calcium status.
- Profile context
- vitamin D receptor, calcium/phosphate metabolism, immune pathways
Quick stats
- Evidence level
- Preliminary evidence
- Typical onset
- Varies by prep
- Safety rating
- Use extra caution: Use caution
- Best for
- Vitamin D Receptor, Calcium/Phosphate Metabolism, Immune Pathways
- Avoid / review if
- Hypercalcemia Or Vitamin D Toxicity, High Dose Use In Conditions That Increase Calcium Without Clinician Monitoring.
Safety
Safety & Cautions
Standard caution
Caution level: Standard. No specific caution categories were detected in the source record.
- Safety evidence
- excessive vitamin D can cause persistent hypercalcemia or hypercalciuria; risk depends on dose, duration, calcium intake, disease context, and measured vitamin D and calcium status
- Who should avoid this?
- Hypercalcemia Or Vitamin D Toxicity; High Dose Use In Conditions That Increase Calcium Without Clinician Monitoring.
- Talk to a professional if
- you are pregnant or breastfeeding, you have a condition named in this safety summary.
High-dose use, kidney disease, granulomatous disease, pregnancy, and interacting medicines require clinician review.
Evidence Summary
Profile-wide ·D PreliminaryEvidence lens
Early signal that needs stronger human replication before practical claims.
PreliminaryPreliminary evidence
Human clinical evidence: Present in source signals
Mechanistic / preclinical: Mechanism mapped — Immune Signaling Modulation · Metabolic Regulation · Innate/Adaptive Immune Modulation
Research maturity: Preliminary research — Early findings are not treated as established consumer benefit.
Safety boundary: Safety note available — Safety evidence: excessive vitamin D can cause persistent hypercalcemia or hypercalciuria; risk depends on dose, duration, calcium intake, disease context, and measured vitamin D and calcium status.
This profile cites 3 human studies.
Evidence Strength
Confidence estimate based on the design quality and consistency of published clinical trials.
Vitamin D has a preliminary evidence rating.
General wellnessGeneral wellness
Citation density
1.0
Sources
3
Effects
3
Research recency
Mixed recency
Evidence Grade
Grade D: Preliminary / Theoretical Evidence
Evaluation of methodological rigor, population reach, and evidence alignment.
- Design Match
- Meta analysis
- Risk of Bias
- Low
- Consistency
- Consistent
Strongest recorded design is a meta analysis, drawn from 5 recorded studies, 5 in people. No disagreement is recorded across them.
How evidence grades work
Each grade reflects the strength and consistency of published human evidence — not marketing claims. Grades are based on study count, design quality, effect size, consistency, and recency.
- Strong
- Multiple RCTs, consistent direction, adequate effect size
- Moderate
- Some RCTs or consistent observational data in humans
- Preliminary / Mixed
- Animal or in-vitro only, or conflicting human data
- Traditional / Theoretical
- Traditional use only; no controlled human trials
Clinical Study Summaries (3)1 human evidence source · 0 human trials · ~11,321 participants across 1 human evidence source with reported N · Consistency not yet classifiable
Filter by study class
Showing 3 of 3 studies.
What the evidence actually shows
This table contains 3 structured sources, including 1 human evidence source; 0 are human trials. Across 1 human evidence source with a reported sample size, the approximate participant total is 11,321; overlapping publications may include some of the same people.
| Study | Design | N | Dose | Duration | Population | Outcome | Result & magnitude | Source |
|---|---|---|---|---|---|---|---|---|
PubMed · BMJ · 2017 Background | Meta-analysis Statistically combines results from multiple eligible studies; confidence still depends on the quality, consistency, and directness of those studies. | n=11321 | — | — | — | — | — | PubMed → |
PubMed · Eur J Prev Cardiol · 2015 Background | Other / unclear The study design is not yet classified clearly enough to infer its place in the evidence hierarchy. | — | — | — | — | — | — | PubMed → |
PubMed · Cancer · 2013 Background | Other / unclear The study design is not yet classified clearly enough to infer its place in the evidence hierarchy. | — | — | — | — | — | — | PubMed → |
How Vitamin D Works
Simplified mechanism pathway based on preclinical and pharmacological evidence. Does not confirm clinical efficacy.
Mechanism Pathway — How Vitamin D Works
CompoundTarget / ReceptorMechanismEffect / Outcome
Dosing
- Common form
- capsule or softgel
- No standardized dose
- Our source data records the usual product form for this ingredient but no studied dose. Preparations differ widely, so follow the standardization on the product you actually have and speak to a clinician before starting.
Mechanisms & biological pathways
Preclinical mechanism details from scientific profiles; these represent plausible pathways but do not guarantee clinical efficacy in humans.
- Immune Signaling Modulation
- Metabolic Regulation
- Innate/Adaptive Immune Modulation
- Bone Mineralization Support
- Vitamin D Receptor (VDR) Signaling
Guides that use Vitamin D
Condition guides
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Compare & Sourcing
Compare side-by-side tradeoffs or verify active marker guidelines.
Related alternatives
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Tradeoffs
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Sourcing options
Vitamin D product picks
Recommendation status
Product recommendations are not shown for this profile because the current site safety and monetization policy does not permit them.
Product form & quality guidelines
When sourcing Vitamin D, verify the label for:
- Standardized Extract: Confirm active content percentages on the supplement facts panel (e.g. standardized to specific marker compounds) rather than simple raw herb weights.
- Third-Party Testing: Look for independent purity labels (USP, NSF, ConsumerLab, or Eurofins) to ensure the product is free from heavy metals, solvents, and contaminants.
- Form Bioavailability: Ensure the form matches evidence-supported configurations (e.g. chelated bisglycinate/glycinate for magnesium, micronized monohydrate for creatine) for optimal onset and digestion tolerance.
Safety first · Harm reduction
This information is educational and not medical advice. Start low, avoid risky combinations, and consult a licensed clinician before making health decisions—especially if you use medications, have diagnosed conditions, or are pregnant/breastfeeding.
Learn how we evaluate confidence, safety, and intensity on the methodology page.
Editorial Review
Checked against primary sources, cited evidence, and contraindication language before publication. Evidence claims, safety language, and affiliate modules are reviewed independently. Not personal medical advice.
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