NIOXIN Scalp + Hair Thickening System 2 Shampoo 33.8 fl oz — for natural/untreated hair, niacinamide & biotin

Nioxin Scalp + Hair Thickening System 2 Shampoo is a professional-strength cleanser formulated to gently remove buildup and create the appearance of thicker, fuller natural hair with progressed thinning.

Designed as the first step in Nioxin's three-part regimen, this 33.8 fl oz shampoo uses Activ-Renewal technology to lift sebum, fatty acids and environmental residue from the scalp and hair shaft. Enriched with niacinamide and biotin, the formula supports scalp clarity and hair resilience so subsequent treatments can better bond to each strand. It’s salon-tested and widely used by those seeking a visible increase in hair density when combined with the matching conditioner and scalp treatment.

How does this shampoo improve the look of thinning natural hair?

The cleanser targets the scalp environment by removing pore-clogging oils and contaminants that make hair lay flat or appear sparse. By clearing residue, hair fibers lift at the root and styling products perform more effectively, creating fuller-looking hair. The formula also delivers ingredients that help strengthen hair shafts to resist breakage.

• Activ-Renewal technology lifts sebum and environmental buildup
• Niacinamide helps support scalp comfort and circulation
• Biotin contributes to hair resilience and reduced breakage
• Suitable as the daily first step in a three-part thickening system

What results can I expect and how quickly?

Individual results vary, but clinical and consumer testing show many users notice improvements in hair thickness, fullness and density within weeks when using the full System 2 regimen. Consistent daily use prepares the scalp and hair so conditioners and leave-on treatments can deliver their active benefits more effectively.

• Visible fullness and density improvements reported by consumers
• Helps reduce hair breakage that contributes to thinning appearance
• Works best as part of Nioxin's three-step System 2 routine
• Award-winning professional formula trusted by stylists

How do I use the 33.8 fl oz shampoo for best effect?

Apply the shampoo to wet hair and gently massage into the scalp and hair for about one minute to activate the cleansing agents. Rinse thoroughly and follow with Nioxin System 2 Scalp Therapy Conditioner and the Scalp & Hair Treatment to lock in the thickening benefits. For consistent improvement, use daily and include the full system.

• Wet hair, lather for 60 seconds, then rinse
• Follow with System 2 conditioner and treatment for optimal results
• Daily use recommended to maintain scalp cleanliness and hair lift
• Large 33.8 oz size reduces refill frequency for regular users

Is this product safe for colored or chemically treated hair?

System 2 is formulated specifically for natural or untreated hair with progressed thinning, so it is intended primarily for hair that hasn't been chemically processed. If your hair is color-treated or chemically altered, consider Nioxin systems tailored to treated hair and consult with your stylist to choose the best program.

• Best suited for natural, untreated hair with progressed thinning
• Check other Nioxin systems for colored or chemically treated hair
• Consult a stylist or trichologist for personalized recommendations

Who this is for: Nioxin System 2 Scalp + Hair Thickening Shampoo in the 33.8 fl oz size is aimed at people with natural, untreated hair experiencing progressed thinning who want a salon-grade daily cleanser that clears scalp buildup and supports thicker-looking hair. It's ideal for those committed to a multi-step regimen—use it with the matching conditioner and scalp treatment for the most noticeable improvement in hair density and fullness.

Ingredients

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