We often overlook the amazing things hiding in our kitchens—like the humble onion. Yet for many people who are facing thinning hair, hair fall or lack of growth, onion oil may quietly offer a gentle, natural support.
Onions are a surprisingly rich source of sulfur, a mineral our hair loves. Sulfur helps build strong hair from the inside out, supporting the production of keratin and collagen—two of the key building blocks of healthy strands. On top of that, onions have antimicrobial and anti-inflammatory properties that can soothe the scalp, help clear blocked follicles, and encourage a healthier foundation for hair growth. And when your scalp is happy, your hair is more likely to thrive.
You don’t need fancy salon treatments to give your hair that kind of grounding nourishment. A simple DIY onion-oil preparation can bring nature’s wisdom into your hair routine. Here’s a basic version: finely chop one large red onion (or two small ones), extract the juice or pulp, gently simmer it together with 100 ml of coconut oil (or olive/castor oil if you prefer), then strain it into a clean bottle. Store it in a cool, dry place and use it within around two weeks for best freshness.
To apply: part your hair and massage the oil into your scalp, focusing on the roots. Spend 5 to 10 minutes gently massaging, then leave it on for at least 30 minutes (or even overnight if your scalp tolerates it—with a cap or towel). Afterwards, wash with a mild, sulfate-free shampoo (you may need two washes if the texture is heavy). Use this treatment about 2 to 3 times a week, and over the weeks you may notice slower shedding, new fine hairs, more fullness, and improved shine.
A few gentle reminders: always do a patch test first (especially if you have a sensitive scalp or known allergies to onions). If you feel burning, redness or irritation—stop immediately. Because onion has a strong smell, you might like to add a few drops of essential oil (lavender, rosemary, peppermint) to your blend. And while this oil certainly supports hair wellness, it isn’t a miracle fix for every kind of hair loss—genetic pattern hair loss, autoimmune alopecia and deeper scalp issues often require expert attention.
Finally, remember: your hair doesn’t live in isolation. What you eat, how you sleep, how you care for your scalp, and how you treat your strands day-to-day make a big difference. Make sure your diet includes protein, leafy greens, iron-rich foods, and stay hydrated. Protect your hair from harsh sun, avoid excessive heat styling, and be consistent with your routine. Natural remedies like onion oil don’t always work overnight—but with gentle, persistent care your hair can become stronger, softer and more vibrant.