Often confused with Black Seed Oil, which is also great for hair fall, Onion Seed Oil or Red Onion Seed Oil, as its sometimes known as, is a potent, natural oil for hair fall solution. It is a magical oil for promoting hair regrowth. Using onion oil on a regular basis will effectively prevent and treat baldness. Onion oil is rich in sulfur which prevents breakage, split ends and thinning of hair. Other nutrients present in onion prevents oxidation of hair. It also maintains the regular pH of the hair, preventing premature greying.