Onion belongs to the Allium family and is very rich in sulfur-containing compounds that are responsible for its pungent odour and health-promoting properties. “We must remember polyphenols are one of the largest categories of phytonutrients in food and the highest content of it is found in onions! A wide variety of allyl sulfides are found in onion, including the four major diallyl sulfides.”
“Methylsulfonylmethane is a highly absorbable source of sulfur, found abundantly in onions especially in its outer layers. It facilitates the formation of keratin for hair, resulting in hair growth. It also helps a great deal in autoimmune conditions of hair loss like Alopecia Aereata,”
Onion juice can be mixed with crushed methi seed powder and kept overnight with honey. Apply it on dry scalp, or mixed with olive oil for normal scalp. It can also be applied for focal hair loss patches.
Many Expert Dermatologists recommend, topical application of onion juice often along with my allopathic medications. Also, in other conditions of hair fall (but only in all non-scarring ones) I often recommend the topical application of onion juice, followed by hot towel or steam application on scalp and washing it off after 30/ 40 minutes.
Onion has antiseptic and antibacterial properties. It also helps fight hair lice, dandruff and can be used as a natural hair nourisher and conditioner. I have also used onion juice along with aloe vera juice and olive oil.
Note:Those allergic to dietary intake of onions can get allergy to the topical application as well. Certain medications such as aspirin and other nonsteroidal anti-inflammatory drugs (NSAID) and beta blockers can increase sensitivity to onions.