I am not sure of how much this will help each individual but it has helped me. So I am offering this to you as a bit of help.
I am Black. PCOS has made my hair thin at the top and very dry. As a child I never EVER had thin flimsy hair.
Fastward through all the PCOS issues.
Try a product called Surge. It's a root stimulator. It's not greasy so it should be ok for all hair types.
If you are shedding, try Aphogee Repair Treatment and Aphogree Recontructor. These should be done weekly while sitting under a heat cap. You can buy a heat cap at a local Sally's type of store.
Scalp massages with Rosemary Oil. It is also a root stimulator.
Try protein treatments with a cholestoral conditioner, also found at a Sally's type of store.
These are strategies that helped my breaking and shedding. There's also a web site
Hair loss help which sells hair vitamins.
I found that these work. MSM, Biotin, and/or Shen Min.
HTH
