chronoFIGHT: The Science of Skin Protection Your face is the most exposed part of your body. As a result, your face ages much faster than skin elsewhere on your body. With chronoFIGHT, we take a two-pronged approach to age-fighting:1. Protect against environmental stressors.2. Fuel up with beneficial nutrients to promote continuous skin repair. Nightly Rebuild is specifically engineered to improve production of collagen, the support structure of your skin. Wrinkles, much like hair loss, are nearly impossible to reverse. That"s why, when it comes to skin care, offense truly is the best defense. We recommend using the Optimal chronoFIGHT series, including Nightly Rebuild, for every man from age 30 on. Nightly Rebuild"s retinol-based formula stimulates collagen production, which in turn improves skin firmness. Increasing collagen presence also stimulates the production of new blood vessels in your skin, which evens out skin tone. Increasing collagen also stimulates the production of new blood vessels in your skin, which smooths out skin tone. Additional ingredients - peptides, ginseng, shea butter, olive and coconut - supply your face with beneficial nutrition for optimum skin health maintenance. Optimal Science is based in Silicon Valley. We"re a group of people who love the outdoors, but hate what the environment does to our skin. We decided to assemble a team of brilliant scientific minds to come up with skin care products that fight back against the damaging effects of time and the environment. We"re proud of the science behind our products, and also that they"re researched and made in the USA. Optimal Nightly Rebuild is: Paraben-free. Hypo-allergenic. Non-comedogenic.