Hi,
To have and maintain healthy hair diet and hygiene are very important.Your diet should be rich in protein,vitamins and minerals.
Iron is important to prevent hair fall.Also include plenty of yellow
for growth of hair.
Nothing applied externally can induce the growth of hair, they can only enhance the appearance.But if you want to try OTC products which claim to be beneficial to hair then you can try it like Neem Hair Gel which is used as a hair conditioner and promoting hair growth, keeping the scalp clean and free from dandruff