You’ve probably seen the hype — onion hair oil has taken the internet (and hair care world) by storm. But is it just another beauty fad, or does this pungent kitchen staple actually deliver real results? Spoiler: when used correctly, onion oil can transform dull, brittle hair into smooth, glossy strands — all while promoting new growth from the roots.

Packed with sulfur, antioxidants, and natural antimicrobials, onion hair oil is a time-tested home remedy that targets everything from hair fall to premature greying. Here’s why it works, how to use it, and even how to make your own at home.

Benefits of onion hair oil

1. Rich in antioxidants
Onion oil contains powerful antioxidants like flavonoids that neutralize free radicals — one of the main culprits behind hair thinning, early greying, and weak roots. Regular use strengthens follicles and boosts scalp health for visibly thicker hair.

2. Stimulates hair growth
The nutrients in onion juice help balance scalp pH levels and enhance blood circulation. This not only stimulates dormant follicles but also promotes faster, healthier hair growth. Over time, you’ll notice stronger strands and less hair fall.

3. Fights scalp infections
Thanks to its antimicrobial and antibacterial properties, onion oil helps prevent dandruff, itchiness, and scalp buildup caused by excess oil or harsh products. It keeps your scalp clean, reduces inflammation, and protects your hair from breakage.

4. Works as a natural conditioner
Onion oil doubles as a deep-conditioning treatment. Mix it with coconut or castor oil for a nourishing pre-wash massage that leaves your hair softer, smoother, and easier to manage. It also helps reduce split ends and frizz over time.

5. Sulfur for strength and shine
Sulfur — the same element that builds keratin, your hair’s main protein — is abundant in onions. This mineral strengthens the structure of each strand, reduces breakage, and supports consistent hair growth.

Precautions before using onion oil

While onion oil has amazing benefits, a few precautions can help you avoid irritation:

• Strong smell: The odor can linger even after washing. Use mild, natural shampoos instead of heavily scented ones.

• Itchy scalp: Overuse may dry out the scalp. Apply once or twice a week only.

• Sensitive skin: If your scalp burns or feels irritated, dilute the oil with coconut or olive oil before applying.

• Avoid daily use: Too much sulfur can trigger dryness or eczema in some people.

How to use onion hair oil

1. Warm a few tablespoons of oil and massage gently into your scalp using your fingertips.

2. Leave it on overnight or for at least 30 minutes.

3. Wash with a mild, sulfate-free shampoo.

4. For best results, use it 1–2 times per week.

5. You can also mix a few drops into your shampoo or hair mask for an extra boost.

How to make onion hair oil at home

One of the best things about onion oil? You can easily make it yourself. Here’s how:

1. Chop 2–3 onions into small pieces.

2. Blend half to extract the juice and the other half into a smooth paste.

3. Heat 1 cup of coconut oil in a pan.

4. Add both the juice and paste to the oil and stir continuously.

5. Let the mixture simmer until the onion residues turn golden brown.

6. Turn off the heat and let it cool completely.

7. Strain through a muslin cloth and store in an airtight glass jar.

You now have a nutrient-rich onion hair oil that can last up to 3 years (though it’s most effective within 6 months).