Stop what you’re doing and run to the bathroom. Open every serum you own and pour them on your face. Don’t dillydally! These products are getting older by the minute and losing their potency, as old things tend to do.
The active ingredients in many of the skin-care products in most medicine cabinets might well be inert. Most of them start off as very stable geniuses, but they don’t all remain that way. As soon as they’re exposed to water, air, and light—essentially, life itself—they start to degrade. In as little as six months, they could be no more useful than a splash of very expensive, slightly discolored, smelly water.
