Does Onion Oil Have Side Effects?No. Onion hair oil is a well-known remedy for fighting dandruff and other types of scalp bacteria, and can be found in many shampoos on the market today.
However, onion hair oil needs to be used sparingly due to its powerful medicinal effects, so start out using it only once or twice per week until you get used to it. Oftentimes people will wash their hair at night with an onion juice shampoo and then let the sauce from the dish head overnight in their bed while they sleep off the odor - this will allow them to wake up with their scalp feeling fresh before starting off another day.
