ByDr. Brennan Commerford, D.C.·Last reviewed: July 2026
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vitamin d3 as cholecalciferol: verification pending

We’re confirming the science for this compound before we publish a form ranking. Our team reviews every ranked page against peer-reviewed absorption data — this one is still under review, so we are not showing a score yet.

Check back soon. Rankings are reviewed by Dr. Brennan Commerford, D.C.

References

  1. D2 competitively inhibits 25-hydroxylation of endogenous D3, reducing overall vitamin D status when used as supplement PubMed
  2. Cochrane meta-analysis: D3 supplementation reduces all-cause mortality while D2 shows no significant effect PubMed
  3. Systematic review confirming D3 superiority over D2 for raising and maintaining serum 25(OH)D levels PubMed
  4. Vitamin D3 showed 87% greater AUC for serum 25(OH)D compared to D2 at equivalent IU doses in RCT PubMed

These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.