Is it safe to use nioxin shampoo and conditioner?By Community Writer | Community.Drprem.com / November 16, 2011 I am using Nixon 2 shampoo and conditioner. I take shower in the mornings and at night. However, I want to know that is using Nixon twice a day safe, or is it too strong for daily use? I would like to hear from some expert. Please help. Today's Top Articles: