Update your routine with Peter Thomas Roth Potent-C Niacinamide Treatment.

How do I use it: Apply twice daily to clean skin in the morning and evening. If mild irritation occurs, use every other day until skin adjusts. Gradually build to daily use. Follow with moisturizer and use SPF protection during the day.

From Peter Thomas Roth.

Includes:

• 1.7-fl oz Potent-C Niacinamide