Cos de Baha - BlankCanvasMakeup review for Vitamin C Serum Ascorbic Acid 15%

I like that it is in a dark bottle. At first I used 4 drops and at 15% potency, it may have been too irritating to my skin. After I noticed this and read the instructions, I reduced it to 2 drops, both morning and evening. That proved to be more tolerable on my face and neck. What took it up a notch for me is when I mixed the 2 drops with an ampoule (propolis or centella). I feel those combinations really helped my skin absorb the vitamin C better. My skin tone is definitely more even after a few weeks of use, and post-acne scars are noticeably fading quicker.