Nioxin Scalp + Hair System 3 Leave on Treatment 100ml

Why you'll love it

• Leave-on scalp and hair thickening treatment for coloured hair with light thinning
• Nourishes and strengthens each strand from root to tip
• Promotes the appearance of thicker, fuller hair
• Helps protect colour while it works
• Clinically and dermatologically tested, with visible results in 30 days*

The leave-on step that does the heavy lifting. Nioxin Scalp + Hair System 3 Leave-On Treatment 100ml is a leave-in thickening treatment, the serum step of the System 3 routine, designed for dry, damaged, colour-treated hair with light thinning. Clinically and dermatologically tested, it nourishes and strengthens each strand from root to tip for the appearance of thicker, fuller hair, while helping to protect your colour as it works.

As a leave-on treatment, it stays in the hair to keep working between washes, nourishing and strengthening each strand to help minimise breakage, which in turn helps hair look fuller and thicker (because less breaks off). It supports a healthier scalp environment too, and helps protect your colour. It's the targeted treatment step that makes the System 3 routine complete, and it can be bought on its own to top up or replace the treatment from your System 3 kit.

What it does for lightly thinning, coloured hair

Dry, damaged, colour-treated hair with light thinning benefits from a leave-on treatment that keeps working all day, especially when you catch thinning early. This serum nourishes and strengthens each strand from root to tip to reduce breakage and promote the appearance of fuller, thicker hair, while helping to protect your colour. Used consistently as part of the System 3 routine, it's designed to deliver visibly thicker, fuller-looking hair over time.

How to use it

Apply the leave-on treatment to a clean, towel-dried scalp and hair, distributing evenly, and do not rinse out. Use as the treatment step of your System 3 routine, after cleansing and conditioning, for consistent, leave-in results, the studies are based on 30 days of regular use. You'll find the rest of the System 3 range in our professional shampoo collection.

Who it's for

This treatment is specifically for dry, damaged, colour-treated hair with light thinning, the System 3 category. If your thinning is more progressed, the System 4 treatment is the better match, and if your hair is natural rather than coloured, Systems 1 and 2 are tailored to you. We've spent years helping clients in Codsall make the most of fine and thinning hair, and catching thinning early with a targeted leave-on treatment like this is one of the most effective ways to support fuller, thicker-looking hair between salon visits.

Build your thickening routine

For the best results, use this treatment as the leave-on step alongside the matching System 3 cleanser and conditioner, and the wider Nioxin range. Have a browse through our full range of professional haircare products to complete your routine, or explore all the professional names we stock over on our shop by brand page.

Add the Nioxin Scalp + Hair System 3 Leave-On Treatment to your routine for visibly thicker, fuller-looking, colour-protected hair. Free UK delivery on all orders.

*Based on consumer studies: 85% of consumers noticed a thickening effect, 80% noticed an increase in hair density, and 80% noticed an increase in hair fullness. Individual results may vary.