Glossier. Super Pure clarifying Face Serum with Niacinamide + zinc l 30 ml l BRAND NEW IN BOX A waterweight Niacinamide serum to reset and balance skin in four weeks. A daily vitamin and mineral duo of Zinc PCA and 5% Niacinamide (the perfect amount to be effective without irritating skin). This double dose nourishes skin for visibly smoother texture, smaller-looking pores, and improved clarity.