Just like the oils we cook with, essential oils do eventually “go bad.” While an expired oil won’t be dangerous to use per se, it will lose its potency and become just another good smell—or a not-so-great one. “Expired oils will smell nasty!” says Mariza Snyder, D.C., a functional medicine practitioner and author of Smart Mom’s Guide to Essential Oils. “If it smells like something you don’t want to put on yourself, you probably shouldn’t.” More telltale signs that an oil will last? It’ll be packaged in a dark bottle (too much light can deteriorate your oils over time), have an orifice reducer (because oils will go bad quicker when they’re exposed to oxygen), and be clearly marked with the plant’s Latin name and expiration date. “Not all oils have expiration dates on them, which really concerns me,” Snyder says. “If they don’t, you really don’t know what you’re working with.” Choosing a high-quality oil is the first step, and from there you need to make sure you’re taking proper care of your new sensory sidekicks. It’s pretty simple: Just keep the bottles closed when they’re not in use—remember what I said about oxygen exposure?—and don’t leave them out in really hot places if you can avoid it. If you do have oils that are on the verge of going bad, it’s time to dust off their bottles and put those babies to work. The quickest way to do so is by mixing up a home cleaner. Simply add the antimicrobial oil of your choice (like lemon or orange) to a mixture of distilled vinegar and water. Here’s one smell-good recipe to get started with. Emma received her B.A. in Environmental Science & Policy with a specialty in environmental communications from Duke University. In addition to penning over 1,000 mbg articles on topics from the water crisis in California to the rise of urban beekeeping, her work has appeared on Grist, Bloomberg News, Bustle, and Forbes. She’s spoken about the intersection of self-care and sustainability on podcasts and live events alongside environmental thought leaders like Marci Zaroff, Gay Browne, and Summer Rayne Oakes.
