Here is an article:
By Dr. John Lee, MD
http://www.johnleemd.com

When progesterone levels fall as a result of overian follicle
failure (lack of ovulation), the body responds by increasing
its production of the adrenal cortical steroid, androstenedione,
an alternative precursor for the production of other adrenal
cortical hormones. Androstenedione conveys some androgenic
(male-like) properties, in this case, male pattern hair loss.
When progesterone levels are raised by progesterone cream, the androstenedione level will gradually fall, and your normal hair
growth will eventually resume. Since hair growth is a slow process, it may take four to six months for the effects to become apparent.

Taken from Dr. John Lee's book, What Your Doctor May Not
Tell You About Menopause page 323
~~~~~~~~~
It's also very important to read Dr. John Lee's books,
What Your Doctor May Not Tell You About Premenopause,
What Your Doctor May Not Tell You About Menopause
and is most recent book
What Your Doctor May Not Tell You About Breast Cancer.

These three books are must reads for any woman who
refuses to pump synthetic hormones into her percious body.

silver threads among the gold,

but my darling you will be,

always young and dear to me!

I've heard castor oil is good for growing hair. Depending on what your problem is, a doctor may make suggestions as to what you can do to reverse the hair loss.

Good luck!