People have been using onion juice to promote hair growth for centuries, so why haven’t you heard of it? A lot of people are reluctant to put onion juice in their hair because of the smell, but if you can get past it, this method really does work. The reason it is so effective is because onion juice contains a lot of collagen boosting sulphur that promotes hair growth. If you’re desperate, it might be time to suck it up and try the onion juice.
Put an onion in a juicer, then work the juice into your scalp. Leave it in for 10 to 15 minutes, then wash it away with shampoo.