It's a catalytic converter
Menstruation is triggered by a drop in the levels of progesterone. It is a hormone in the body that functions to regulate and stimulate a number of functions especially in females. It is a sex hormone and has an important role in pregnancy.
There are a lot but yogurt, pickles, sauerkraut, cheese, kefir, sour cream, sourdough, and kimchi are some examples.
