the female hormones, progesteron and estrogen, can play a role in hair loss in women. The ratio of the amount of progesteron to estrogen is important. That's why women may lose hair during pregnancy, after pregnancy, and during menapause, since during all these times the ratio of the two female hormones shift a lot.

some women experience hair loss right before or during menstrual periods. That sort of hair loss is also attributed to hormone balance shifts.

there are herbs that adjust the hormone ratio in women. the most important and the potent one is chasteberry (also known as vitex). It is safe, and used by women to adjust their hormone balances naturally for thousands of years.