These progesterones contain the male hormone testosterone, and are components of most contraceptive pills and hormone replacement therapies (HRT).
It is this progesterone ingredient which can tip a womens hormone balance too heavily towards the androgens.
One progestogen, norethisterone, contains more levels of testosterone than any other form of the pill or HRT.
Just like men, women inherit a genetic predisposition to Alopecia Androgenetica which can often lie very dormant for many years, so that many people with the predisposition often go through life without ever realising they are in the danger of hair loss.
The increases mentioned are occurring due to the fact that these days more and more women are taking these HRT's and contraceptive pills that were largely unheard of a few decades ago.
The commercial world seems to have a wonderful ability to cure on problem and create two others! It is interesting to note that when the contraceptive pill was first tested there were suspected cases of hairloss, as much as 50 years ago.
It was not really in commercial interests to tell people that the pill could lead to acne, sporadic body and facial hair growth or hairloss, so those details were largely left unsaid.
Thinning hair in women is often triggered when they start of when they stop the pill, in older women this can coincide with the onset of menopause, and as hormone levels are at naturally high levels at this time, the effects can be very noticeable.
It is also well known that Alopecia can set in after child birth, especially in older women who bear children later in life eg.
35 to 45.
Again, in this natural process the womens body is very vulnerable to changes because of the fluctuation of hormones and the natural stresses pregnancy puts on the body.
Most cases of alopecia triggered from child bearing are areata in nature, and will come right in due course.
It is only in a small number of cases that alopecia androgenetica is triggered by child bearing.
Another big culprit nowadays is also work related stress.
Women in top jobs are more and more common, and this can lead to changes in sleep, diet and bodily functions-all of which are perfect triggers for Alopecia conditions.
Beware before you commit to that 60 hour a week, high stress job!