I have been a big proponent of Vitamin D supplementation. I utilize high doses in females trying to get pregnant. Finally there is some research to support vitamin D and reproduce biology.
There is an association of low vitamin D levels and reduced clinical pregnancy rates in women undergoing IVF that has been well-documented.
Today, adequate vitamin D levels is a predictor of clinical pregnancy.
I also discuss intake of gluten and cows dairy, B12 levels (whether the patient has a methylation defect) and most importantly thyroid levels.
Happy May Day!