A Potent Vitamin C: Drunk Elephant C-Firma Fresh Day Serum Brighten your complexion with the potent Drunk Elephant C-Firma Fresh Day Serum ($78). It contains a powerful blend of antioxidants and fruit enzymes to reveal a radiant, even-toned complexion. To make sure you get the freshest batch of vitamin C serum, you have to mix the pure vitamin c powder into the liquid base right before you start using it. Image Source: ulta.com Drunk Elephant C-Firma Fresh Day Serum $78 from ulta.com Buy Now