The Ordinary - Ascorbyl Tetraisopalmitate Solution 20% in Vitamin F - 30mlAscorbyl Tetraisopalmitate Solution 20% in Vitamin F A brightening, Anti Aging Serum. This serum contains ascorbyl glucoside, a watersoluble derivative of Vitamin C. Being more compatible with water allows for a pleasant serum texture whilst still retaining all of the brightening properties of pure Vitamin C. It is considered a gold standard of Vitamin C derivatives and has been shown to offer specific skin brightening benefits, reduce the signs of