Higher levels of Vitamin D among women may reduce their risk of developing breast cancer post menopause, claimed a new study. The study found that women with blood levels of serum 25-hydroxyvitamin D (OH) -- the main form of vitamin D in blood -- above 60 ng/ml (nanograms per millilitre) had one-fifth the risk of breast cancer compared to those with less than 20 ng/ml.

Thus, researchers from the University of California-San Diego determined that the minimum healthy level of 25(OH) in blood plasma should be 60 ng/ml, instead of the earlier recommended higher than the 20 ng/ml.