Onion Essential Oil is a concentrated, sulphur-rich oil steam-distilled from the bulbs of the onion plant (Allium cepa), and it is used mainly diluted in haircare to support stronger roots and scalp health, and in skincare to help fade dark spots. It is potent and should never be applied neat to skin or swallowed — always mix a few drops into a carrier oil first.
What is Onion Essential Oil?
This is not the same as the cold-pressed cooking onion oil you may know. Azlok's Onion Essential Oil is a yellow to brownish-golden liquid extracted by steam distillation, with a strong, sharp odour that comes from its main constituents, dipropyl disulphide and dipropyl trisulphide. Those sulphur compounds are exactly why the oil is prized in beauty formulations.
Key details at a glance:
- Botanical name: Allium cepa
- Part used: Bulb
- Method: Steam distillation
- Form: Golden to brownish-yellow liquid
- Shelf life: around 2 years
- Solubility: soluble in alcohol and most fixed (carrier) oils
Common uses
People reach for onion oil for a handful of reasons, mostly around hair and skin:
- Hair and scalp care: Added to hair oils and masks to support the scalp, help with dandruff, and condition strands from root to tip.
- Skin brightening: Used in tiny amounts within serums and creams to help even out skin tone and target dark spots.
- Spot treatment: Occasionally blended into targeted acne-spot formulations.
- Massage and therapeutic blends: Combined into massage oils and aromatherapy mixes.
How to use it safely
Because this oil is highly concentrated, dilution is not optional. A little goes a long way.
- Choose a carrier. Onion oil blends beautifully with coconut oil, castor oil and mustard oil. Start with roughly 3–5 drops of essential oil per tablespoon of carrier.
- Patch-test first. Apply a small diluted amount to your inner forearm and wait 24 hours to check for redness or irritation.
- For hair: Massage the diluted blend into the scalp, leave it on for 30–60 minutes, then wash out with a mild shampoo. The odour rinses away; a second wash helps.
- For skin: Keep concentrations very low and avoid the eye area. Do a patch test even on all skin types.
Safety notes worth taking seriously
Onion essential oil is powerful and demands respect. Please read this before using it:
- Do not ingest it. It can be irritating and toxic to the digestive, urinary and reproductive systems in concentrated form.
- Not for pregnant women. The product carries a caution against use during pregnancy.
- Keep it away from children and store it out of reach.
- Never apply undiluted to skin or scalp — always mix into a carrier oil.
- Work in a ventilated space; the odour is strong. Keep the oil away from open flame (flash point around 105°F).
When in doubt, consult a qualified dermatologist or your doctor before adding a new active oil to your routine.
Buying and storage tips
Azlok stocks Onion Essential Oil from 50 gm bottles right up to 25 kg drums, so hobbyists and small businesses can both find a sensible size. Prices start at ₹449. A few pointers:
- Buy the smallest size that suits you first, so you can test the aroma and how your skin responds.
- Store in a cool, dark place, tightly capped, away from sunlight and heat.
- Use within about two years for best quality, and keep the lid clean to avoid contamination.
- Ask for the COA and MSDS if you are formulating products for sale.
FAQ
Can I apply Onion Essential Oil directly to my scalp?
No. It is too concentrated to use neat. Dilute a few drops in a carrier such as coconut or castor oil, patch-test, and then massage the blend into your scalp.
Does onion oil really help hair?
It is traditionally used to support the scalp, condition hair and help manage dandruff. Results vary from person to person, and it works best as part of a consistent routine rather than a one-time fix.
How do I get rid of the onion smell after using it?
Wash with a mild shampoo, and follow with a second gentle wash if needed. Diluting the oil in a fragrant carrier and rinsing thoroughly usually keeps residual odour minimal.
Is it safe during pregnancy?
No. The product carries a specific caution against use by pregnant women. If you are pregnant, breastfeeding or have a medical condition, avoid it and speak to your doctor.
What oils does onion essential oil blend with?
It blends well with coconut oil, castor oil and mustard oil, which makes it easy to fold into homemade hair oils and masks.