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NIOXIN System 1. Nioxin Pro Clinical's System 1 is designed for natural, untreated hair with light thinning. Clinically and dermatologically tested, it's designed to amplify hair texture and strengthen resilience, resulting in thicker, fuller hair.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.