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Vitamin C
Antioxidants
Flavonoids
These compounds are known to play roles in tissue repair, collagen synthesis, and inflammation reduction—all factors that could theoretically support healthy hair growth.
But translating that into “pour red onion juice on your scalp and watch your hair grow faster” is where scientific backing starts to thin—though not entirely disappear.
How a Red Onion Rinse Is Supposed to Work
Proponents of the red onion hair rinse generally highlight a few key mechanisms:
1. Improving Scalp Circulation
The sulfur content in onions may stimulate blood flow to hair follicles when applied topically. Improved circulation can help deliver nutrients and oxygen to hair roots.
2. Combating Free Radicals
Antioxidants in red onions can theoretically reduce oxidative stress on hair follicles, which some studies link to hair weakening and loss.
3. Antimicrobial Properties
Onions have natural antimicrobial compounds that might help reduce scalp issues like dandruff, which—if severe—can contribute to hair breakage.
4. Protein and Collagen Support
Collagen is essential for strong hair structure. Some believe the nutrients in onions can support collagen production.
