This shampoo gave me shiny, smooth hair without irritating my sensitive scalp.
This shampoo made my hair shiny and smooth without causing back itch, but the medicinal smell and lack of thickening left me disappointed.
This is a review from Amazon.com about product:
Nioxin Scalp + Hair Thickening System 3 | For Colored or Damaged Hair with Light Thinning | With Niacinamide and Biotin | Trial Size | 1 Month Supply

This shampoo and conditioner leaves my hair very shiny and smooth, and (of major importance) doesn't make my back itch. But it smells like an old-fashioned hospital, and I think the thickening comes from that third little bottle, and it made where I sprayed it feel rough, and, to me, unpleasant. If anything, my hair may be thinner than before.
I won't be buying it again.
Shampoo Basics & Tips
Understanding Shiny and Smooth Hair
Shiny, smooth hair often results from formulas containing silicones (e.g., dimethicone) or natural oils. These ingredients coat the hair cuticle, reflecting light and reducing frizz. However, buildup can occur, requiring occasional clarifying washes.
Preventing Scalp Irritation
The absence of back itch suggests a sulfate-free or hypoallergenic formula. Sulfates (SLS/SLES) strip natural oils, causing dryness and itching. Alternatives like coco-glucoside gently cleanse without irritation.
Clinical Scent in Hair Products
A "hospital-like" smell may stem from preservatives like phenoxyethanol or minimal fragrance additives. Brands targeting sensitive skin often avoid synthetic perfumes, which can trigger allergies.
Thickening Claims vs. Reality
Some shampoos use proteins (e.g., keratin) or volumizing agents (e.g., panthenol) to thicken hair. However, improper use or harsh ingredients (e.g., alcohol) can dry strands, leading to breakage and thinner-appearing hair over time.
Post-Use Texture Issues
A "rough" feeling after application might indicate product residue or incompatible ingredients (e.g., certain polymers). Always rinse thoroughly and avoid mixing silicone-based products with water-insoluble formulas.
My hair becomes soft and shiny using little shampoo, so it lasts.
This shampoo leaves my hair soft and shiny; it's a bit expensive but the durable glass packaging and long-lasting use make it worth buying again.
I loved how Routine shampoo enhanced my hair health and reduced shedding for years.
I used Routine shampoo for three years and it greatly improved my hair's appearance and reduced hair loss, but after my latest purchase, I've experienced increased shedding and my hair doesn't look as good as before.
I use this shampoo for curly hair; it's healthy, smells great, and recommended by my barber.
My barber recommended this shampoo for my curly hair, and it has made my hair much healthier with a uniquely wonderful smell, and I also use their hair mask which works wonders perfectly.
I love this shampoo's woodsy scent that smooths my hair beautifully.
My favorite shampoo with a light woodsy scent smooths my hair and keeps it fresh, even when I air dry.
I loved the shampoo idea but the bag was hard to squeeze.
I appreciated the shampoo's eco aspect but found the plastic bag difficult to squeeze and refill, resulting in wasted shampoo and a frustrating experience.
My shampoo review: after a year, it reduces hair loss with pills.
After over a year of use, my shampoo cut hair loss with oral meds. It's costly but durable due to thrice-weekly use, and I bought it from my barber, directly, or Amazon easily.
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