Red Onion Water in Your Shampoo – A Simple Trick for Longer, Stronger, Shinier Hair

Red onion juice has been used for generations to support hair growth, reduce shedding, and add natural shine. By soaking sliced red onions in water and mixing the infused liquid into your regular shampoo, you can create a gentle, effective treatment that takes seconds to add to your routine.

Red onions are rich in sulfur compounds, which are essential building blocks for keratin – the protein your hair is made of. They also contain quercetin, an antioxidant that helps reduce inflammation on the scalp and improve circulation to hair follicles.

The Red Onion Shampoo Mixture

What you need

  • 1 medium red onion
  • ½ cup water
  • Your regular shampoo

How to make it
Peel the red onion and slice it into thin rings. Place the slices in a bowl and pour the water over them. Let them soak for 15 to 30 minutes – the water will turn slightly pink and take on the onion’s beneficial compounds. Remove the onion slices (you can compost them or use them in cooking). Pour the infused water directly into your shampoo bottle, or mix a few tablespoons into a small bowl with your shampoo each time you wash.

How to use it
Use this mixture as you would your regular shampoo. Massage it into your wet scalp for 2 to 3 minutes, focusing on the roots. Leave it on for an additional 5 minutes if you have time. Rinse thoroughly. Follow with conditioner if desired. Use it every time you wash your hair – two to three times per week.

Why this works

The sulfur in onion juice helps your body produce more keratin, which strengthens each strand from root to tip. The improved circulation from the quercetin helps deliver oxygen and nutrients to hair follicles, encouraging growth. The antimicrobial properties of onion also help keep the scalp clean and free of dandruff.

What you might notice

After a few weeks, you may see less hair in your brush or shower drain. After a month, new baby hairs may appear along your hairline, and your hair will look shinier and feel thicker.

A few tips

Use fresh red onions – yellow or white onions have less quercetin. The onion smell rinses out completely with shampoo; you will not smell it in your hair afterward. For an extra boost, you can also use the soaked onion slices to gently scrub your scalp before shampooing.

A simple, natural habit

Red onion water, mixed into your regular shampoo, is an easy way to give your hair the nutrients it needs to grow longer, stronger, and shinier. No elaborate recipes, no extra steps – just a small change that can make a big difference.

For more amazing kitchen tricks, check out how to grow 21 onions from just one or discover the Japanese secret tea for wellness.