Vitamin D raised blood levels without a clear live-birth benefit in PCOS
A randomized IVF trial found no statistically clear live-birth improvement after the first embryo transfer, despite higher vitamin D levels.
Based on the published abstract. The full paper may contain additional methods, results and limitations.
The 30-second takeaway
For women with polycystic ovary syndrome undergoing IVF, vitamin D supplementation increased blood vitamin D levels but did not show a clear improvement in live birth after the first embryo transfer. The result separates a laboratory response from the fertility outcome that mattered most in this trial, while leaving some uncertainty about the true effect.
This abstract-based summary concerns pretreatment before IVF and live birth after the first transfer. It does not establish effects on cumulative live births across later transfers or on fertility in people without polycystic ovary syndrome.
What researchers found
Live birth after the first embryo transfer
Following pretreatment: 52.0% with vitamin D versus 50.2% with placebo. The result did not demonstrate a clear benefit.
Blood levels and live births
The main question was whether more participants had a live birth, rather than simply whether their vitamin D levels rose. Higher blood levels alone therefore do not answer the trial's central question about IVF outcomes.
A complication was also assessed
Severe ovarian hyperstimulation syndrome was also assessed. Its confidence interval included no difference between groups, so this result does not establish a protective effect against that complication or settle the intervention's overall safety.
The original publication
Vitamin D supplementation before in vitro fertilisation in women with polycystic ovary syndrome: multicentre, double blind, placebo controlled, randomised clinical trial.
Hu KL, Liao T, Wu Q et al.
BMJ · 2026
- PubMed ID
- 41702641
- Record checked
AI-assisted research and writing. This explains one selected publication; it is not a complete review of everything known. Our approach.
One more question, understood.
Keep track of the research you’ve explored.