leimo is effective as in to grow new hair or to prevent hair loss?

actually what's the cause of the problem ha? outside or inside? how would outer treatment (shampoo and all kind of hair medicine) prevent hair loss or grow new hair?

if something to eat..then i think it makes more sense as YOU ARE WHAT YOU EAT

anyone can clarify? I'm also having this problem...my dad's front bald..so i think i'm gonna be like him