Proscar/Dutasteride will block testosterones conversion to DHT in the scalp(however, test will still bind to the androgen-recepter in the scalp), and Nizoral-shampoo will remove some androgens in the scalp.

These to products will help to slow it down. But if youre prone, you have to take it very easy with steroids, or get a hair-transplant.

Deca is the one aas that wont hurt you b/c of its conversion to DHN, thrue the 5ar, which has very weak affinty in the scalp/skin. But using Deca alone is not very pleasent.