Vitamin D
Written by Fertility Decoded. Reviewed by D R, MS (OBG), FRM. Review date: 31 August 2026.
The verdict
Standard-dose supplementation is universally recommended; no solid evidence extra amounts improve fertility beyond correcting deficiency.
A fat-soluble vitamin; deficiency is common even in sunny climates (indoor lifestyles, pollution, skin-covering norms — relevant in India too).
What the evidence shows
NICE: a standard 10µg/day year-round dose is the one universally recommended preconception/pregnancy supplement.
Evidence for extra/high-dose vitamin D specifically boosting fertility beyond correcting a deficiency is weaker and mixed — the real benefit signal is about correcting low levels, not megadosing.
Evidence tier
Standard care🟢 Recommended regardless of any fertility-boosting claim — a baseline, not a supplement bet.
Frequently asked questions
- Correcting a real deficiency is worthwhile and standard-dose supplementation is universally recommended, but there's no solid evidence that extra or high-dose vitamin D improves fertility beyond fixing low levels.
- Yes — indoor lifestyles, pollution and skin-covering norms make it common despite the climate, so testing is reasonable.
Does vitamin D help you get pregnant?
Is deficiency common in India?
Sources
Take this further
Sources last reviewed .