Probably not much — both are minoxidil topical treatments. Both Nioxin and Rogaine ... scalp treatments promote new hair growth, a healthy scalp and the thickening of fine hair.

The Nioxin three-part System 3 Loyalty Kit for Coloured Hair with Light Thinning is a hair thickening treatment for coloured hair that is designed to restore moisture and amplify texture.

I also compiled expert-recommended hair thickening shampoos ... consider the Nioxin Hair Regrowth Kit. Product type: Shampoo, conditioner, treatment | Key ingredients: Peppermint oil, niacinamide ...