There’s a new buzzword going around in the world of skin care. Epigenetics, or heritable changes in gene expression, is being touted as the latest trait that can be addressed by skin-care products. It’s the idea that topical products, like moisturizers and serums, can impact and change gene expression. While nonmedical skin-care brands have long used terms like antiaging, firming, and lifting, many have stopped just short of saying that products could have any real effect on a deeper level, like its pharmaceutical counterparts, partly because of the percentage of each active ingredient being used in these formulas. Still, the use of the word epigenetics in skin-care marketing leaves much…