how can i make my hair regrow?

hello, in the last two years my hair? was really spreading. I used to have thick hair but now my hair is fine and I feel like if I go bald. I am only 23 and I do not know what is happening. c ‘? some brand of shampoo or conditioner that I use to regrow hair? Rogaine for women not work? I’m afraid of going bald please help me.

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