Finding out whether onion oil for hair growth truly works has become a global curiosity — especially among people dealing with thinning hair or postpartum shedding. But beyond the viral DIY hype, what does science actually say? Can onion and oil really help hair grow, or are there cleaner, safer ways to achieve the same results?
This guide breaks down the facts, expert advice, and modern alternatives — including vegan hair care from Hair Folli, Australia’s clean beauty leader in scalp health and shine.
Why Onion and Oil Became a Hair Growth Trend
The onion oil trend originates from ancient Ayurvedic practices and became viral through social media, where influencers shared dramatic regrowth claims. Onion is naturally rich in sulfur — a key nutrient in producing keratin, the main protein that strengthens hair strands.
As more people turned to natural remedies, onion oil for hair growth became a symbol of clean, affordable self-care. Yet dermatologists warn that raw extracts or DIY versions can cause irritation or scalp imbalance if overused.
The Science Behind Onion Oil for Hair Growth
Scientific studies reveal that onion extract supports scalp health and follicle strength through three key mechanisms:
- Sulfur strengthens keratin bonds, improving hair structure and elasticity.
- Antioxidants like quercetin protect hair follicles from oxidative stress and pollution damage.
- Anti-inflammatory compounds may reduce scalp irritation and promote a balanced microbiome.
Benefits of Using Onion and Oil for Hair
When used correctly, onion oil can improve scalp condition and hair texture:
- Promotes growth and thickness: Sulfur and antioxidants stimulate follicles and keratin formation.
- Reduces hair fall: Strengthens roots when combined with hydrating carrier oils.
- Fights dandruff: Natural antibacterial properties help reduce scalp buildup.
- Improves shine: Oils such as coconut and olive help lock in hydration.
- Delays greying: Antioxidants protect pigment cells from premature ageing.
How to Make Onion Oil at Home
To create your own onion oil safely, follow this simple method:
- Extract juice from two small onions.
- Mix with three tablespoons of a carrier oil (coconut or olive).
- Heat gently for 5–7 minutes and allow it to cool.
- Strain and store in a clean glass bottle.
- Massage into the scalp for 10 minutes and leave for 30–60 minutes.
- Wash thoroughly with a mild, sulfate-free shampoo.
Potential Side Effects and Safety Notes
Despite its benefits, onion oil may not be suitable for everyone:
- Strong odor: The smell can linger even after multiple washes.
- Scalp irritation: Sulfur may cause redness or dryness on sensitive scalps.
- Allergic reactions: Those with eczema or dermatitis should avoid raw onion oil.
- Colour-treated hair caution: The acidity of onions can fade dyed hair faster.
Onion Oil vs Onion Juice — Key Differences
| Factor | Onion Oil | Onion Juice |
|---|---|---|
| Texture | Oily and nourishing | Watery and light |
| Effect | Provides long-lasting hydration | Delivers quick nutrient absorption |
| Shelf life | Up to 3 weeks (refrigerated) | 1–2 days only |
| Odor level | Moderate | Strong |
| Best for | Dry or brittle hair needing moisture | Oily scalp types needing detox |
Clean & Vegan Alternatives to Onion Oil (Recommended by Hair Folli)
If you love natural ingredients but dislike the smell or irritation of raw onion, Hair Folli’s vegan hair care range delivers the same scalp benefits through clean science.
Hair Folli Vegan Hair Growth Spray
Best for: All hair types, including sensitive scalps.
Key actives: Caffeine, rosemary, and aloe boost circulation and support keratin production without buildup or odor.
Why it’s better: Mimics onion oil’s growth benefits through clean, vegan ingredients safe for daily use.
Expert Tips for Healthy Hair Growth
- Rinse hair with cool water to protect cuticles and add shine.
- Massage the scalp 2–3 times per week to boost circulation.
- Avoid overusing oils — buildup can clog follicles.
- Choose sulfate-free, vegan products to maintain scalp balance.
- Be consistent — visible improvements take 4–6 weeks.
Conclusion — Natural Power, Modern Balance
Onion oil for hair growth offers nutrients that can help support keratin and scalp health, but its odor and irritation risk make it less practical for modern routines. Clean, vegan alternatives from Hair Folli provide the same benefits — backed by science, formulated for everyday use, and gentle on all hair types.
Healthy hair doesn’t come from strong smells — it comes from consistent, balanced care. Discover the cleaner, smarter way to grow.
About the Author: Dr Tran formulates vegan scalp treatments and growth systems combining cosmetic science with clean ingredients. Her research helps Australians achieve stronger, shinier, and healthier hair — ethically and sustainably.