Onion for Hair Growth: The Smelly Secret That Actually Works (+ DIY Recipes)

You scroll through your camera roll, find a photo from exactly one year ago, and — wait. Your hair looks exactly the same length. 😤 You’ve tried the flax seeds for hair growth trick (and yes, it’s genuinely worth it), you’ve dabbled in a dozen different hair growth methods, and yet your hair seems to have decided it’s perfectly happy right where it is.

You’ve tried the deep conditioners. You’ve done the trims. You’ve taken the vitamins. And your hair has decided it’s perfectly happy right where it is, thank you very much.

It’s time to try something that sounds a little weird, a little smelly, and honestly a little unhinged — onion. Yes. The one that makes you cry in the kitchen. As it turns out, your scalp might have been desperately craving what onion has to offer all along. 🧅✨

First let’s take a look at why it makes your hair grow and how long it takes to work, and then I’ll share some powerful DYIs to make your hair grow fast.

Why Onion Makes Your Hair Grow Fast

Onions are loaded with sulfur — an essential building block of keratin, the very protein your hair is made of. When you apply onion to your scalp, you’re feeding your follicles one of the key nutrients they need to produce stronger, faster-growing strands.

But the real hero is quercetin, a powerful antioxidant that reduces oxidative stress on the scalp, stimulates hair follicle activity, and even helps with autoimmune-related hair loss like alopecia areata. Onion is also naturally antimicrobial, meaning it fights the yeast and bacteria that quietly clog follicles and stall your hair growth routine before it even starts.

Here’s what it actually does:

Boosts keratin production → thicker, stronger strands
Improves scalp circulation → nutrients reach follicles faster
Fights scalp buildup and dandruff → unclogged follicles = better growth
Reduces oxidative stress → less breakage, less thinning
Awakens dormant follicles → yes, even the ones you thought were checked out permanently

Onion vs. Other Hair Growth Methods: Real Talk

Here’s an honest look at how onion stacks up against other popular hair growth methods. (Spoiler: it holds its own surprisingly well 👀)

Method	Key Benefit	Growth Boost Potential	Smell Factor
Onion juice/oil	Sulfur + quercetin, stimulates follicles	⭐⭐⭐⭐	😬 Strong (manageable)
Rosemary oil	Clinically proven to rival minoxidil	⭐⭐⭐⭐	🌿 Pleasant
Rice water	Protein + inositol, strengthens strands	⭐⭐⭐	😐 Mild
Castor oil	Thickens hair, seals moisture	⭐⭐⭐	😐 Neutral
Scalp massage	Stimulates blood flow	⭐⭐	😇 None
Nothing	—	⭐ baseline	😇 None

Without any intervention, your hair grows around 0.5 inches (1.25 cm) per month on average.

With consistent onion juice use — specifically twice daily application — a landmark study published showed that people using onion oil had a regrowth rate 74% faster than people who didn’t.

So onion wasn’t just working — it was working dramatically better than doing nothing.

Some people in consistent use report gaining closer to 0.75–1 inch per month in active growth phases, especially when combined with scalp massage.

We’re not talking magic. But we are talking about a real, measurable difference in your hair growth journey. 📈

The Easiest Option: Store-Bought Onion Hair Oil

Look — not everyone wants to be boiling onions on a Sunday. And that’s valid. Store-bought onion oils are absolutely a legit option, especially for beginners or anyone who just wants something quick and consistent to add to their routine.

The most popular ones you’ll find (and can grab on Amazon) include:

WOW Skin Science Onion Black Seed Hair Oil 🛒 — one of the most widely loved options, blends onion seed oil with black seed oil for a double antioxidant punch. Great for all hair types.
Mamaearth Onion Oil for Hair Growth 🛒 — infused with redensyl and amla, so it’s going after hair growth from a few angles at once.
Urbangabru Onion Oil for Hair Growth 🛒 — great value, no mineral oil, and has a comb applicator for easy scalp application.
Parachute Advansed Onion Hair Oil 🛒 — comes with a comb applicator and has a lighter consistency than most, which is a win if you hate the greasy-hair aftermath.

How to use store-bought onion oil:

Part your hair into sections
Apply directly to the scalp using the dropper or applicator (use sparingly — a little goes a long way)
Massage in for 5–10 minutes
Leave on for at least 30 minutes, or overnight
Wash out thoroughly — double shampoo is your best friend here
Repeat 2–3 times per week

The main thing to look for on the label: onion seed extract or onion bulb extract should be in the first half of the ingredient list. If it’s buried near the bottom, you’re mostly paying for the marketing.

Method 1: Classic Onion Juice (The OG)

onion juice method to accelarate hair growth

The most researched method, and the one backed by actual studies.

What you need:

1 medium red onion (red has higher quercetin content than yellow)
A blender or fine grater
Cheesecloth or a fine mesh strainer
A small dropper applicator bottle 🛒 or cotton ball

How to do it:

Blend or grate the onion, then squeeze juice through cheesecloth
Part your hair into sections
Apply juice directly to the scalp using a cotton ball or dropper
Massage in for 5–10 minutes (you’re also doing a hair massage for growth simultaneously 💆‍♀️)
Leave on for 30–60 minutes — or overnight if you’re brave
Wash out with a gentle shampoo. Shampoo twice.
Repeat 2–3 times per week for at least 4–6 weeks

💡 Power-up: Add 5 drops of rosemary essential oil 🛒 before applying. Rosemary was shown in a randomized trial to be as effective as minoxidil for hair regrowth — together with onion, they’re basically an unstoppable duo.

Method 2: Fermented Onion Juice (The Upgraded Version 🔥)

fermented onion juince for faster hair growth

This is next-level. Fermenting onion juice amplifies its quercetin content and introduces enzymes that make the nutrients more bioavailable for your scalp. Think of it as onion juice that went to the gym.

What you need:

Freshly squeezed juice from 1 red onion
8 oz water
1 tsp sea salt
½ tsp raw honey
A glass jar + cheesecloth (not a lid — it needs to breathe)
1 tsp castor oil 🛒

How to make it:

Combine the onion juice, water, salt, and honey in your glass jar
Cover loosely with cheesecloth
Let it ferment at room temperature for 72 hours
Strain well, then stir in the castor oil before each use
Apply to scalp, leave for 45–60 minutes, rinse, double shampoo

Store in the fridge for up to a week. This method is especially worth trying if you’ve been dealing with thinning or shedding that won’t quit — the amplified quercetin hit is no joke.

Method 3: DIY Onion Hair Oil (For the Long Game 🌿)

If the smell of straight juice is a dealbreaker, making an onion-infused oil is the move. The oil dilutes the intensity while still delivering sulfur compounds into the scalp — and it’s something you can leave on overnight without your partner relocating to the couch.

What you need:

1 medium red onion, roughly chopped
½ cup coconut oil 🛒 (or jojoba, olive, or argan — all work beautifully)
Optional add-ins: a few cloves of garlic (extra sulfur!), a small handful of curry leaves, a sprig of fresh rosemary

How to make it:

Combine onion and oil in a small saucepan
Simmer on very low heat for 15–20 minutes — infuse, don’t fry
Let cool completely
Strain really thoroughly through cheesecloth — removing all onion solids also removes most of the smell
Add 5–10 drops of lavender or sweet orange essential oil if you want a friendlier scent
Store in an airtight glass jar for up to a month (refrigerate in warm climates)

To use: Warm a small amount between your palms, section your hair, massage into the scalp. Leave for at least 30 minutes or overnight. Wash out with a gentle shampoo.

Method 4: Onion + Honey Hair Mask (The Glow-Up Mask 🍯)

This is the gentler, more moisturizing approach — perfect if your hair is on the drier or more damaged side. Honey acts as a humectant that seals moisture in while the onion gets to work on the scalp.

What you need:

3 tbsp fresh onion juice
2 tbsp raw honey
1 tbsp aloe vera gel 🛒
5 drops rosemary essential oil

Mix together, apply to scalp and mid-lengths, leave for 30–45 minutes, rinse, shampoo. Use once a week. The aloe vera soothes the scalp and aids absorption — and it’s genuinely one of the best supporting ingredients you can add to any hair growth mask.

Method 5: Onion Water Rinse (The Lazy Girl Version 💁‍♀️)

Can’t commit to the full production? An onion water rinse is a great weekly add-on to your existing routine.

Boil 1 chopped red onion in 2 cups of water for 10–15 minutes
Let cool completely, then strain into a spray bottle or jar
After shampooing and conditioning, pour it over your scalp as a final rinse
Do NOT rinse out — just style as usual

It’s lighter than the other methods but still delivers sulfur and quercetin to your follicles. Great for anyone who wants to ease in before committing to masks or oil treatments.

The Smell Problem: Let’s Be Real 👃

Yes, onion smells. No, it doesn’t have to ruin your life. Here’s how to keep it manageable:

Double shampoo every single time — this is non-negotiable
Add a few drops of peppermint, lavender, or orange essential oil to any onion preparation
Do an apple cider vinegar rinse after washing — it neutralizes odor-causing residue
A little diluted lemon juice poured over hair post-wash also works well
If you’re making DIY oil (Method 3), strain thoroughly — onion solids are where most of the smell lives

Most people find the smell disappears completely after washing. The double shampoo is the key, not the fancy deodorizing tricks.

What to Expect: A Realistic Timeline

No one wakes up with Rapunzel hair after one application. But consistency pays off:

Weeks 1–2: Scalp feels more stimulated, possible slight tingle — that’s circulation doing its thing 🩸
Weeks 3–4: Less shedding, visibly thicker-looking roots for many people
Weeks 6–8: New growth visible, especially around the hairline and temples
3–6 months: Measurable length difference — potentially 0.75–1 inch more than your baseline, if you’re consistent

The magic word is consistent. Twice a week for 3 months beats every day for two weeks then giving up. Set a recurring calendar reminder and treat it like a non-negotiable part of your routine. 📅

Not sure if something else is quietly blocking your growth? Take this free quiz — it’ll tell you your #1 growth blocker in about 2 minutes. 👇

Onion + Other Powerhouse Ingredients (The Dream Combos 🌿)

Onion plays beautifully with other natural hair growth heroes. Here are the best pairings — and why they work:

Add This	Why It Works	Best Used In
Rosemary oil	Clinically shown to rival minoxidil; boosts circulation	Juice, oil, mask
Castor oil	Thickens hair, seals moisture, extends shelf life of DIY oil	Oil, mask
Aloe vera gel	Soothes scalp, adds slip, aids absorption	Mask, rinse
Fenugreek	Rich in proteins and nicotinic acid; underrated growth booster	Mask, oil
Garlic	Extra sulfur hit; works synergistically with onion	Oil
Cloves	Stimulate scalp circulation; great in a boiled rinse	Water rinse

If you want to explore more hair growth oils to pair or alternate with onion, there are some seriously good DIY recipes worth adding to your rotation.

Tips to Get the Best Results 🌟

Use red onions specifically — they have higher quercetin content than yellow or white
Always do a patch test first, especially if your scalp tends to run sensitive
Pair every application with a scalp massage — even 4 minutes makes a measurable difference in strand thickness over time
Don’t overheat your DIY preparations — excessive heat degrades the active compounds
Stay consistent with your hair care routine for hair growth — onion works best as part of a broader strategy, not a one-off panic treatment

More Tips for Beautiful and Healthy Hair 🌿

Your hair growth journey is bigger than any one ingredient — and sometimes there’s something deeper going on worth figuring out. These posts can help you go further: