The Onion Oil regenerates hair follicles to prevent hair thinning. Bhringraj is known to promote hair growth by nourishing your scalp. Onion oil strengthens hair at the follicle level, stopping it from breaking and getting thinner. Bhringraj, on the other hand, improves the condition of the scalp and hair as a whole. It has bhringraj oil in it, which is known to make hair stronger from the scalp to the ends and help new hair follicles grow. Because they have sulphur, onions can actually make our hair stronger.