As an intensive lightening treatment, apply NEWHITE Serum morning and night for 14 consecutive days. To use the serum : – Remove the pure Vitamin C ampoule from its bag and break off the top. – Then pour the powder from the ampoule into the serum bottle. Re-seal and mix vigorously. – Apply the serum with your fingertips in light strokes. For best results, follow the application techniques in the video. To enhance and accelerate the brightening results of the Vitamin C Brightening Serum, use NEWHITE Day Cream SPF 30 and/or NEWHITE Night Cream. This product contains pure Vitamin C which may vary in colour over time. To ensure optimal effectiveness, use the serum within 14 days of mixing.