Tata Harper calls this a "facelift in a bottle," and she's not far off. After just five minutes, the Tata Harper Boosted Contouring Serum, $185, starts to tingle and tighten skin. Two hours later, your face looks more toned. And after four weeks, jowls are reduced. While this creamy serum contains a laundry list of botanicals, it's the brown algae extract that really does the contouring magic. (Notice a trend? Lots of algae on this list.)

DHC Beauty Lift Essence, $49, feels light and silky, yet it's incredibly hydrating. It contains a peptide complex to soften fine lines and oat kernel extract to lift sagging skin — plus a slew of moisturizing ingredients that make skin look instantly plumper.

Sure, The Organic Pharmacy Gene Expression Serum, $330, is a splurge, but this skin tightening serum addresses basically every skin concern -- not just sagging. It contains a vegetable peptide to tighten loose skin by controlling the release of Progerin, a protein that accelerates aging (and probably sounds familiar if you saw the HBO documentary "Life According to Sam"). Hibiscus helps skin produce collagen, retinol fights wrinkles, aloe calms inflammation and grape stem cells protect skin from the sun. And there's an overwhelming dossier of research to back it all up.