Castor oil packs can be used for fertility support and postpartum during breastfeeding, but should NOT be used during pregnancy. Contrary to popular belief, castor oil packs CAN be used during your period, but if it’s your FIRST time ever doing a castor oil pack, wait until the end of your period to begin, otherwise you may experience more intense period cramps. After regular usage there is no issue doing your pack on your period. Often many practitioners note that your period improves with a regular castor oil pack practice.