Onion Juice for Hair Growth and Hair Loss Onion Juice for Hair Growth and Hair Loss: Onion is one of the best hair treatments. Ensure that the onion juice covers your entire scalp. The ingredients of onion juice are used in medicines for treating hair loss and hair growth. Best home remedies for hair growth and hair loss. You can apply onion juice on your hair for remove hair loss and hair dandruff. There are no side effects of using onion juice, unless and until you are allergic to onions. Onion for get rid dandruff is the wonderful home remedy. Ways to Use Onions for Hair Loss and Hair Growth. 1. Onion hair packs for hair loss:- ü Take 2 big onion to fine chopping and squeeze juice out. ü Then apply this juice on your scalp, and massaging. ü Leave it on for 15-20 minutes. ü Then wash your hair with mild shampoo and warm water. 2. Raw onion remedy for hair loss:- ü Take 1 onion, peel this onion and cut to slice. ü T