Josie Maran Argan Beta-Retinoid Pink Algae Serum The 2 percent retinol in this Josie Maran Argan Beta-Retinoid Pink Algae Serum ($68) is derived from a beta-carotene-rich pink algae. This ingredient converts into retinol in the skin to reduce the look of fine lines and dark spots and is gentler on skin that may be sensitive to other retinol products. Image Source: sephora.com Josie Maran Argan Beta-Retinoid Pink Algae Serum $68 from sephora.com Buy Now