System 1 Shampoo (Scalp + Hair Thickening System 1 Cleanser)

A cosmetic shampoo, the first step of Nioxin's System Kit 1, for natural, untreated hair with light thinning. The manufacturer says it is designed to cleanse away excess sebum and impurities from the scalp and to make hair look thicker and fuller. It is a cosmetic, not a hair-loss medicine.

Wild mint oil (Mentha Arvensis Leaf Oil), peppermint oil, salicylic acid

As stated by the manufacturer (see sources below). Formulas and specifications can change — check the pack or listing.

Apply to the scalp, massage gently and evenly, then rinse thoroughly. The brand recommends following with the System 1 conditioner and leave-on treatment, using the full three-step system at least 3 times a week.

None stated on the manufacturer's product page; check the pack.

• Hair loss & thinning