NutriStack
Vitamin D3 protects bone health, the receipts.
Important for calcium absorption, but high-quality meta-analyses do not show reduced fractures or improved BMD from supplementation alone in community-dwelling adults.
Moderate evidence, per the methodology. Strongest 4 studies linked to PubMed.
Recommendation, contrary evidence, and dose are all on this page.
The studies
Strongest evidence, sourced.
Sorted by study tier (meta-analyses first, then RCTs, then reviews) and recency. Every entry links to PubMed by PMID.
At a glance
- Substances
- Vitamin D3
- Evidence tier
- Moderate evidence
- Strongest studies surfaced
- 4 of 4 matching
- One-line verdict
- Necessary, not sufficient.
- Last verified
- May 30, 2026
Top 4 studies
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Meta-analysis
Combined supplementation with whey protein, leucine, and vitamin D improved muscle mass and physical performance in patients with sarcopenia.
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Meta-analysis
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Meta-analysis
Effect of supplemental vitamin D3 on bone mineral density: a systematic review and meta-analysis PMID 36308775
Systematic review assessing the effect of vitamin D3 supplementation on bone mineral density across multiple RCTs
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Meta-analysis
Vitamin D supplementation did not prevent fractures or falls or have clinically meaningful effects on bone mineral density in unselected community-dwelling adults
Contrary evidence
What pushes back.
Caveats, null findings, and methodological limits that hold the tier where it is.
What argues against the claim
- Bolland et al. 2018 Lancet meta-analysis: no significant effect on fractures or BMD.
- VITAL trial: no reduction in fractures even at 2,000 IU/day over 5 years.
Recommendation
What the evidence supports.
What we recommend, with caveats
Adequate vitamin D is a prerequisite for bone health, not a treatment for osteoporosis. Pair with adequate calcium (food first), weight-bearing exercise, and protein.
Tier criteria are documented at /methodology/evidence-tiers. Sourcing standards at /methodology/interactions.
Stack interaction risks
Where these substances clash.
Documented pairings involving the substances behind this claim. Cautions and conflicts come first.
Pairs in the database
- Chlorthalidone + Vitamin D3 · Caution
- Digoxin + Vitamin D3 · Caution
- Hydrochlorothiazide + Vitamin D3 · Caution
- Vitamin A + Vitamin D3 · Caution
- Alendronate + Vitamin D3 · Synergy
- Amlodipine + Vitamin D3 · Synergy
Open the free interaction checker at /interactions to scan a full routine.
Goal hubs
Where this claim feeds in.
Goal-based hubs that index this claim alongside related supplements and protocols.
Related goal hubs
Before you go
One claim, opened up. NutriStack does this for every claim in the database.
The full library lives at /research. Every entry follows the same shape: the verdict, the studies, the contrary evidence, the recommendation, and the primary literature.