I'd like to know this too, as I never had the hairloss symptom until very recently and I have been diagnosed for about 7 years but had many other symptoms for a few years before that. Mine happened after I came off Spiro a few months back, so I went back on it but I don't really want to be on meds forever ideally.
I hear that sea kelp is good for hair loss/growth and many women on here swear by the herb Saw Palmetto but I don't think it helped me. I thought hairloss was very much a hormonal thing but strangely my androgen levels were lower 2 months after coming off Spiro (Spiro is an anti-androgen) but my Dr thinks losing weight and low carbing during that time may have helped reduce these levels. I just would have thought that lower androgen levels would have prevented hairloss but it seems this was the opposite for me! Weird! It's hard to say if my hairloss has improved since ging back on Spiro as it is early days yet. I can't see/feel any new growth but my hairdresser thinks it hasn't got any worse, which is reasssuring. I'm lucky I have thick, curly hair so it is not too noticeable if I style it well.
Hopefully this is something you will never have to worry about but it is wise to take preventative measures, if there are any

I suppose the reason some women get hairloss and some don't, is the same as why some men lose their hair, whilst others (like my 85 y o Grandfather!) retain a good head of hair all their lives. Genetic no doubt!
Nikki x