Sirtuins are some of the latest discoveries in anti-aging. The enzymes are believed to help prevent cell oxidization that commonly leads to cell death. In terms of your health, they help fight aging, obesity, type II diabetes, gout and Parkinson's disease.
In the beauty world, they work to keep your skin cells healthy for an extended amount of time. Studies show that they can help protect against photoaging and stress.
Without being too cynical — I mean, how much of this do we actually know is true? — don't be surprised if you see products from Avon, Estee Lauder and Caudalie claiming they've bottled the next fountain-of-youth ingredient. These brands have already integrated sirtuins into some of their products. In fact, you can read more about Avon's Anew Ultimate Age Repair Night Cream (which Allure has stamped with its seal of approval) here. ($34).