Peter Thomas Roth Potent-C Power Serum Peter Thomas Roth Potent-C Power Serum (£81) is one powerful serum. It promises to be 50 times more powerful than regular vitamin C and gives my skin a huge boost of antioxidants for a brighter complexion. — TC Image Source: lookfantastic.com Peter Thomas Roth Potent-C Power Serum £81 from lookfantastic.com Buy Now