I have discovered Garnier Ultimate Blends shampoo and conditioner ( they have an Argan Oil one) I like the Lemon and Green Tea.
Think nourishing hair from within is a good idea, make sure you eat plenty of protein (eggs are good for hair health) supplement that include Biotin, and the Omegas, a good multi vitamin and mineral supplement benefits both skin and hair.
Try not to blow dry hair too often, mop up wetness with a towel, and then massage scalp and hair dry with fingers, this encourages blood flow.
Another tip is shampoo in reverse, put your conditioner on first, leave on for as long as you like and then shampoo out. Using an whisked egg on the hair before shampooing can thicken and add shine.
HRT can be both good and bad for the hair, some women find it thicken it, others say it sheds more and thins.