Onion shampoo sounds like something out of a Dr. Seuss book — weird, unexpected, maybe even a little gross. But here’s the thing: it actually works. “Onion contains sulfur, which is a key building block for keratin, the protein that makes up your hair,” says Dr. Ross Kopelman, a hair transplant surgeon at Kopelman Hair Restoration. “It also has antimicrobial properties that can support a healthier scalp environment. Some studies suggest it may increase blood flow to the scalp and reduce inflammation, which are both important for hair health.”

Worried about smelling like French onion soup? Don’t be. Most brands combine onion extract with ingredients like rosemary or lavender to mask the scent. 

That said, it’s not for everyone. To find out more about who should or shouldn’t use onion shampoo, its natural benefits and the best brands making this shampoo, check out our guide.

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Editorial Note: Opinions, analyses, reviews or recommendations expressed in this newsletter are those of the NBC Select editorial staff's alone, and have not been reviewed, approved or otherwise endorsed by any third party. Pricing and availability are accurate as of publish time.