The main culprit in the case of ineffective beauty products? Your shower.More
Fragrances are made possible by complex chemical formulas, so it makes sense that their two greatest enemies are heat and light—both catalysts of chemical change. If you stash perfumes in your bathroom cabinet (or worse, on a windowsill) they won't "go bad," but the top notes will degrade faster. Your cool, dark fridge could be the perfect fragrance haven—just keep your bottles towards the front or in the shelves on the door because extreme cold can be just as damaging.
There's no reason to put a brand-spanking-new polish the fridge; those are better left somewhere room temperature so they don't thicken. But older polishes in need of a little restoration—maybe your favorite shade that's been discontinued, or a luxe brand you splurged on—will get a boost from cold temperatures, which will resuspend the pigments that settled in the bottom of the bottle.