Vitamin D
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.
Sources
Take this further
Last reviewed .