People who are pregnant or breastfeeding should not take myo-inositol. Myo-inositol has been known to induce uterine contractions, which can be dangerous for pregnant women. Additionally, there is a lack of research on the safety of myo-inositol for those that are nursing and it can affect the nursing baby's health if taken in large amounts. People with certain medical conditions such as kidney disease or diabetes should also avoid taking myo-inositol without consulting their doctor first. It is always best to seek advice from your physician before starting any new supplement regimen.