When Gwyneth Paltrow shares recommendations, we pay attention. From macrobiotic food to GOOP-approved cleanses and more, the actress makes it all sound worthy, because, well, she looks like that. Right up there with J.Lo and Naomi Campbell, she's one of the few among us who seem to legitimately be aging in reverse. Naturally, when she revealed the treatment she says took five years off her face and tightened her neck, we were all ears—despite the fact that she said it felt like "getting smacked in the face by a rubber band that has an electric shock in it." The scary-sounding treatment in question? It's called "Thermage," and it's a non-invasive (no knives or scalpels) skin-tightening procedure that uses radio frequency to stimulate the production of collagen. The website Charlotte's Book came out with an in-depth guide to everything there is to know about Thermage, so click here to find out if it's for you.