Nioxin System 4 Trial Kit is a hair care system for color-treated hair with progressive thinning. This unique set of three professional hair care products is specially formulated as a hair thickening treatment that provides color protection and fuller hair. The Nioxin System 4 routine refreshes the scalp, reduces hair loss due to broken strands, strengthens the hair and gives color-treated hair a healthy shine. Nioxin Cleanser Shampoo removes dirt, excess oil and other environmental residues from the scalp and hair. Nioxin Scalp Therapy Conditioner is a lightweight conditioner that helps give hair resilience while moisturizing the scalp and hair from root to tip. Nioxin Scalp & Hair Treatment refreshes the scalp and helps produce thicker-looking hair by increasing the fullness of each strand. The Nioxin System 4 Trial Kit is a combination of the old Nioxin System 6 Kit and the Nioxin System 4 Kit. The new Nioxin System Kit 4 is suitable for dry, damaged and colored hair and targets individuals with slightly more severe hair loss. If you previously loved Kit 6, you will love the new Kit 4. The kit has been clinically proven to reduce hair loss due to broken hairs by up to 91%**. **based on a 2016 SIRS survey of 230 US hair thinning panelists