Remember the great kale takeover that dominated the zeitgeist a few years back? As production of the leafy green grew by more than 60% between 2007 and 2012, according to U.S. Department of Agriculture data, consuming the fiber-, protein-, and vitamin-packed super veggie with every meal (or at least showing your support sartorially, like Beyoncé) became the ultimate health flex.
12 Retinol Serums That Will Get You Your Glowiest Skin Ever
