According to WebMD, there isn’t much information on this. A small study looked at it in patients with alopecia areata, a condition that causes uneven hair loss.
While the other half applied tap water to their scalps, the first group applied onion juice twice daily. After two weeks, 74% of the onion juice group had some hair growing back, compared to 13% of tap water users.
However, according to science, their a numerous ways for onion juice to be efficient for hair growth.
How to make
The onions should be peeled and cut into little bits. For a flawless mix, add water. Use the paste made after blending it, or filter the water. To apply pure onion juice to your hair, take these simple steps.
Step 1: Squeeze the juice from one onion into a basin, then dip a cotton pad into it.
Step 2: Use this pad to cover your entire scalp with hair and let it sit there for a few minutes.
Step 3: Use a gentle shampoo and conditioner to wash your hair.
Step 4: After washing your hair, you can give your strands a few drops of any essential oil to cover the strong smell.