A vitamin C concentration of at least 8% is necessary for the product to be biologically effective, and experts say the best vitamin C serum should have a concentration of 10–20% .Sep 1, 2021
Is Vivier skincare medical grade?
Since 1997, Vivier has provided pharmaceutical-grade skin care products to dermatologists and their patients. Each product in the line is developed with only the finest medical-grade ingredients and undergoes extensive testing.
How do you use Vivier serum?
Place two to three drops in palm of hand and use fingertips to apply a thin layer to face, neck, chest and back of hands as desired. Apply once or twice daily to clean, dry skin before any makeup or creams. Tighten dropper securely after each use.