Turn to Facebook, your neighbor — hell, a random person on the street — and you’re bound to hear about the essential oil that wiped out their skin condition or helped them kick a nasty cold. Simply put, essential oils are kind of a big deal.  “Scent is tied to memory more than any of our senses,” says Emilie Hoyt, the founder of LATHER. “It has an incredible power to affect our mood and well-being.” The obvious next step is shopping for them. “To ensure that you’re getting the highest quality, look for Clinical Grade pure essential oils with the Latin name of the plant on the packaging and a notation of ’100% Pure,’” says Barbara Close, a certified herbalist, esthetician, and aromatherapist, as well as the founder of Naturopathica. “Pure essential oils will be stored in dark (amber or cobalt blue) glass bottles to protect the oil from degrading with exposure to light. Finally, be wary of low price tags. Most essential oils require large amounts of plant material to produce a single oz., so the price should be proportionate.” Once that’s checked off your to-do list, you need to learn how to actually use them ...