Vitamin D 'may increase IVF success depending on woman’s race'
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"It's an intriguing association that merits further study," Pal added.
Even though Rudick's team aren't sure why these differences exist, they think it might have something to do with the enzyme that deactivates vitamin D.
According to them, there are also ethnic differences in the gene for the vitamin D receptor, which may affect the link between vitamin D and conception.
The study has been published in the journal Human Reproduction.