At the beginning of menstruation and in the time leading up to ovulation it can be really useful to do a castor oil transdermal pack. I may have asked you to do one of these for many reasons but most commonly to help relieve or reduce some undesirable symptoms throughout your cycle (e.g period pain, clotting etc) or to help “clean up” the endometrial lining and uterus (“stagnation” or “cold”).