Onion Juice for Hair Loss: The Studies, Honestly
Onion juice is often shared online as a hair growth secret. The research behind it is one small, older study in one type of hair loss. Here is what it found, what it does not show, and what to do instead if your hair is thinning.
Few home remedies spread as fast online as onion juice for hair. Videos promise thicker hair and new growth from something that costs almost nothing.
The reality is more modest. There is one small study, from 2002, in people with a specific condition called alopecia areata. It is interesting, but it is not proof that onion juice regrows hair, and it says nothing about the most common kinds of thinning. This article walks through what is known, so you can decide whether it is worth the smell, and when to get proper help.
What alopecia areata is
The American Academy of Dermatology describes alopecia areata as a condition that causes hair loss, usually in round or oval patches on the scalp or beard. It is not contagious.
An important detail: in alopecia areata, hair can grow back on its own, and some people never have another episode. Others find the hair falls out again. This natural regrowth makes any treatment hard to judge without a careful comparison group.
Simple Onion Juice Scalp Application
You need
- onion, peeled1 medium
- fine sieve or clean thin cotton cloth1
- clean cotton padsa few
Method
- Patch test first. Dab a little onion juice on the inside of your forearm, rinse after 15 minutes and watch the spot for 48 hours. If you notice burning, redness, itching or a rash, do not use it on your scalp.
- Grate or blend the onion, then press it through the sieve or squeeze it in the cloth to collect the juice.
- Dip a cotton pad in the juice and dab it only onto the area of the scalp you want to treat. Keep it well away from your eyes, and do not use it on broken, sore or irritated skin.
- Leave it on for 15 to 30 minutes.
- Rinse thoroughly with lukewarm water and wash with a mild shampoo to reduce the smell.
- Make fresh juice each time and throw away leftovers. Stop at once if your scalp stings, burns or becomes red.
Tips
- Onion juice can make your eyes water while you prepare it, so work in a well-ventilated room.
- The smell can linger in hair and on pillows, so many people use it in the evening before washing.
- If you try it, take photos in the same light every few weeks so you can judge honestly whether anything changes.
What the evidence says
The study most often quoted was published in the Journal of Dermatology in 2002 under the title Onion juice (Allium cepa L.), a new topical treatment for alopecia areata. People with patchy alopecia areata applied crude onion juice to the patches twice a day for 2 months, and a comparison group applied tap water.
As reported, 23 people used onion juice and 15 used tap water. Hair regrowth was seen in about 87 percent of the onion juice group, compared with about 13 percent of the tap water group.
Those numbers sound impressive, but there are real limits. The study was very small. Tap water is a weak comparison, because people could easily tell which treatment they had from the smell. Alopecia areata can improve on its own. And as far as is known, the result has not been repeated in larger, well-designed trials.
Most importantly, the study was only in alopecia areata. It did not test onion juice for male or female pattern hair loss, hair shedding after illness or pregnancy, or thinning from tight hairstyles. There is no good evidence that onion juice helps those.
What actually helps hair loss
Hair loss has many causes, including recent pregnancy, illness or surgery, cancer treatment, major weight loss, alopecia areata, scalp psoriasis, hereditary thinning, damaging hairstyles, infections, and nutritional or hormonal problems. The American Academy of Dermatology notes that some people have more than one cause.
A dermatologist can examine your scalp, ask about your history and, if needed, order blood tests or a scalp biopsy. Depending on the cause, options include minoxidil, corticosteroid injections for patchy alopecia areata, prescription medicines, and other treatments.
Starting treatment soon after you notice hair loss makes regrowth more likely, and results often take months. Supplements are only advised when a blood test shows a deficiency, because too much iron or other nutrients can be harmful.
Questions people ask
Does onion juice regrow hair?
One small 2002 study in people with patchy alopecia areata found more regrowth with onion juice than with tap water. It has not been confirmed in larger trials, and there is no good evidence for other types of hair loss.
Can onion juice help male or female pattern hair loss?
It has not been shown to. The only study tested alopecia areata. A dermatologist can explain proven options for pattern hair loss, such as minoxidil.
How long would it take to see results?
In the study, people applied it twice a day for 2 months. Hair loss treatments in general often take months to show results, which is another reason to get a proper diagnosis early.
Sources
- Onion juice (Allium cepa L.), a new topical treatment for alopecia areata — Journal of Dermatology (PubMed)
- Hair loss types: Alopecia areata overview — American Academy of Dermatology
- Hair loss: Diagnosis and treatment — American Academy of Dermatology
This article is for general information only and is not medical advice. Herbs can interact with medicines and health conditions. Talk to a doctor or pharmacist before trying a herbal remedy, especially if you are pregnant, breastfeeding, giving it to a child, or taking any medication.
