
According to Deciem, "Niacinamide (Vitamin B3) is indicated to reduce the appearance of skin blemishes and congestion" while "A high 10% concentration of this vitamin is supported in the formula by zinc salt of pyrrolidone carboxylic acid to balance visible aspects of sebum activity." In other words, this serum-like product is supposed to give you clearer, brighter, healthier looking skin.
And I found that it did kind of do this. Using it on the parts of my face that were already at B-level did result in visibly improved skin, taking it up to an A-level. I'd put this on at night and when I'd wake up the next morning, my skin would be soft, smooth and clear.