To achieve this aim , we measured a panel of biotin biomarkers among pregnant ( gestational week 27 at study entry ; n = 26 ) , lactating ( postnatal week 5 at study entry ; n = 28 ) , and control ( n = 21 ) women who participated in a 10 - to 12-wk feeding study providing 57 g of dietary biotin/d as part of a mixed diet .