This potent serum helps fight against "slackened" skin, cellulite, and water retention, thanks to a patented complex that promises to turn "fat-storing" cells into "fat-burning" cells. it also has sesame extract, which helps form a film on the surface of the skin to visibly lift and shape those less-than-firm areas.

Lierac Body-Slim Firming Lifting Serum, $55, available at Lierac.