Lancome Visionnaire Skin Solutions 15% Vitamin C Correcting Concentrate’s formula was well-executed by the brand, especially with the addition of 15% of pure vitamin C to take care of brightening the skin. What excites us about this serum is the intense hydration it brings, thanks to the hyaluronic acid added to its formulation. With those both ingredients in the mix, we deem it a great skincare product that actually performs, with our experience of reduced puffiness, more even skin tone, and an overall brightened complexion. A note of caution for those with smell sensitivity though: the scent of this product can come off a bit odd.