So, has anyone heard of using onion to combat hair growth. Well, its true. And, I can assert this because I have tried it on myself. Onion is rich in sulfur which is one of the essential nutrients in promoting hair growth. So, if you are facing a lot of hair fall problems or have developed any bald patches on your head, try onion. It stimulates hair growth. It is also beneficial for people who want to increase the length of their hair. But, putting onion on a very healthy hair would really not show much difference. Onion is also useful for treating dandruff and other scalp infections like dry scalp or itchy scalp. For any major infections, you should definitely consult a doctor. Onion is not a medication.