I tested this [Insert Brand Name] oil by dropping it on a white piece of paper. Most pure essential oils (except for thicker ones like Patchouli or German Chamomile) should evaporate completely without leaving a greasy ring. This one passed perfectly, which tells me it isn't cut with carrier oils like jojoba or almond oil.

If you stick to reputable brands (avoid the "too good to be true" 20-bottle kits for $10), Amazon is a fantastic place to build your collection. Just make sure the bottle lists the Latin name of the plant and the country of origin . Pro-Tips for Amazon Oil Shopping:

If Rose, Sandalwood, and Jasmine are the same price as Lemon or Eucalyptus, they are almost certainly fake. Those florals are incredibly expensive to produce.

Never buy oils in clear or plastic bottles; light and plastic degrade the oil's quality.