Garlic contains essential components needed to promote hair growth like calcium, sulfur, and zinc. It can also help to make your hair grow faster than usual. To make this treatment, you will need one teaspoon of garlic juice and a tablespoon each of onion juice and olive oil. Once you have applied the treatment on your hair and scalp, leave it on for at least an hour. Wash it off with a mild shampoo. Use it regularly to get the most out of it.