Vitamin C

What does vitamin C do for dark spots and dullness?

Vitamin C is an antioxidant used in skin care to help improve the visible look of dark spots, uneven tone, dullness, wrinkles, firmness and brightness. Consistent use and daily sunscreen are important parts of a brightening routine.

Peter Thomas Roth Potent-C products use THD Ascorbate, a potent form of vitamin C described on the product page as "50 X more powerful than traditional Vitamin C."

Frequently Asked Questions

Which form of vitamin C is most effective?

Forms vary in stability, potency and tolerability. Potent-C™ formulas feature THD Ascorbate; the best choice is a well-formulated product appropriate for your skin and used consistently.

How long does vitamin C serum last once opened?

Follow the period-after-opening symbol and storage directions. Keep the product closed and away from excessive heat and light, and replace it if color, odor or texture changes significantly.

Can I use vitamin C with retinol?

Many routines use vitamin C in the morning and retinol at night. Introduce actives gradually and reduce frequency if irritation occurs.