CLAIM Modeled after jasmonic acid, a molecule found in plants that helps them self-repair, the active ingredient in this serum improves the appearance of wrinkles in just four weeks without causing any redness. EXPERT OPINION "I like the technology, and I think it's a good alternative for someone who can't tolerate retinol," says Dr. Jeannette Graf, noting that it can soften fine lines and even out your skin. "It's less irritating and sun-sensitizing than retinol." OUR VERDICT It made our pores slightly less noticeable and gave skin a glow. Our complexion also looked a lot less red and uneven than on the placebo side of our faces. Keep in mind: It's scented, so sniff before you buy.