ONION :onion is one of the best remedies for treating hair and hair loss. It's sulfur content improves blood circulation, stimulates hair follicles and promotes hair regrowth.When added to the hair and scalp, onion can provide extra sulfur to support strong and thick hair, thus preventing hair loss and promoting hair growth. The sulfur from onions may also help promote collagen production. Collagen in turn helps the production of healthy skin cells and hair growth.