If you’ve been scrolling through TikTok or Instagram lately, you’ve probably noticed onion showing up in more than just your kitchen. That’s right—onion shampoo has officially entered the curly hair chat, and the results people are seeing are hard to ignore.
But does it actually work? And more importantly, will your curls smell like a French onion soup? Let’s break it down.
Why Onion for Hair Growth?
For centuries, onion has been used in traditional beauty rituals to support healthy hair. Now, modern science is catching up. Onions are naturally rich in sulfur, a key building block for keratin—the protein that makes up your hair. They also contain isoquercetin and flavonoids, which help strengthen hair structure and protect follicles from damage.
Beyond that, onion has antimicrobial properties that support a healthier scalp environment, which is essential for anyone dealing with buildup, dandruff, or sluggish growth. And don’t worry—today’s formulations have figured out how to give you all the benefits without the pungent smell.
Our Top Pick: As I Am Onion Shampoo
When it comes to onion shampoos formulated specifically for textured and curly hair, As I Am leads the pack with their new Onion Hair Growth Collection.
What makes it special:
- Clinically studied results – In ex-vivo lab studies, the combination of red onion juice and isoquercetin increased hair growth by up to 135%
- Sulfate-free formula – Gently cleanses without stripping your curls of moisture
- Ceramide-enriched – Contains Ceramide NP, EOP, and AP to strengthen the hair barrier
- Sub-micron technology – Breaks ingredients into smaller particles for deeper penetration into the hair and scalp
- Smells amazing – A fresh Golden Yuzu fragrance with notes of citrus, apple, and pineapple (not a hint of onion!)
In product testing, the shampoo moisturized hair by 126% and removed 97% of sebum buildup. It’s vegan, cruelty-free, phthalate-free, and silicone-free—checking all the boxes for clean beauty lovers.
The As I Am Onion Collection also includes a conditioner and an Onion Water spray for daily strengthening, so you can build a complete routine around healthy growth.
Best for: All curl types (2A-4C) looking to support stronger, healthier hair growth with a science-backed, clean formula.
More Onion Shampoos Worth Trying
WOW Skin Science Onion Black Seed Oil Shampoo
A cult favorite that combines onion extract with black seed oil for double-duty strengthening. It’s sulfate-free, works well on all hair types, and is known for delivering visible results relatively quickly. Great for those who want an affordable entry point into onion hair care.
Best for: Budget-conscious shoppers who want proven results.
Mamaearth Onion Shampoo
This popular option pairs onion extract with plant keratin for a gentle yet effective formula. Reviewers consistently note that it doesn’t smell like onion at all—just a pleasant, fresh scent. It’s also sulfate-free and cruelty-free.
Best for: Those who prefer Ayurvedic-inspired formulations with clean ingredients.
Biotique Onion Black Seed Oil Shampoo
A 100% botanical, Ayurvedic formulation that strengthens hair from the root. The anti-fungal properties help combat dandruff while the onion and black seed work together to promote circulation and reduce hair fall.
Best for: Anyone dealing with dandruff or scalp issues alongside hair fall concerns.
Lotus Botanicals Red Onion Shampoo
This pH-balanced shampoo is paraben-free, silicone-free, and 100% vegan. It’s designed to reduce frizz and dryness while keeping your natural oils intact—particularly helpful for those with color-treated hair who need gentle care.
Best for: Color-treated curls that need gentle strengthening.
Tips for Using Onion Shampoo on Curly Hair
- Focus on your scalp – Apply the shampoo in sections and massage into your scalp, where the growth-boosting magic happens
- Follow with conditioner – Onion shampoos can be clarifying, so always follow with a moisturizing conditioner
- Be consistent – Like most hair growth solutions, you’ll see the best results with regular use over 6-8 weeks
- Patch test first – If you have a sensitive scalp, test on a small area before going all-in
The Bottom Line
Onion shampoo isn’t just another TikTok trend—there’s real science behind why it works. The sulfur content supports keratin production, the antioxidants protect your follicles, and the antimicrobial properties keep your scalp healthy.
If you’re ready to give your curls a growth boost, our top recommendation is the As I Am Onion Shampoo. It’s specifically formulated for textured hair, backed by clinical studies, and smells like a citrus dream rather than your dinner prep.
Your curls deserve the best. Give onion a try—your future hair will thank you.
Have you tried onion shampoo? Drop your experience in the comments below!
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