You may notice inositol as an ingredient in some prenatal vitamins on the market. Inositol, sometimes referred to as vitamin B8, acts as an insulin sensitizer, which means that it helps regulate blood sugar levels. With the rising rates of prediabetes, type 2 diabetes, and gestational diabetes, as well as PCOS, inositol is being looked at as a valid therapeutic approach to blood sugar management in pregnancy. It may be included in some prenatal supplements and is generally recognized as safe.