. . . . . "In addition to vitamins A, B, C and E, and minerals such as magnesium, selenium and zinc, Acne-d???s formula incorporates Horsetail Herb Extract, a healing herb that is rich in silica to promote softer, smoother skin; Collagen Hydrolysate, a protein that aids in moisturizing and firming the skin; and L-Proline, an amino acid that helps build collagen and repair skin damage." . .