Estee Lauder’s new Time Zone Line & Wrinkle Reducing Lotion SPF 15 ($58.00 MSRP, Amazon.com) promises to preserve your skin’s youthful firmness with its inclusion of sirtuins.  Sirtuins work by prolonging the life of fibroblasts,  the cells that make collagen, by turning off their unnecessary gene expression (i.e., when the fibroblasts aren’t expending more energy than they need to on unnecessary tasks, they will last longer).  This means that sirtuins theoretically should prolong the life of the fibroblasts in your skin,... read more