It is safe to take biotin supplements while breastfeeding, as the amount of biotin that passes into breast milk is minimal and the baby's needs for biotin are lower than for adults. However, it is important to note that the effectiveness of biotin for hair loss is very limited. It is recommended to focus on a balanced diet with fruits, vegetables, meats, and dairy products to ensure your biotin needs are met. If you continue to experience hair loss, it may be worth consulting with a doctor to rule out any underlying hormonal issues, such as those related to thyroid gland changes during and after pregnancy.