Pure THC oil starts by extracting the cannabinoid from the cannabis plant, converting any THCA to THC, distilling it, and putting it through a purification process. The result is a highly concentrated THC oil distillate that is often mixed with other cannabinoids, flavorings, or natural oils to create a variety of products from edibles to medicated salves. Pure THC distillate can have up to a 90 percent concentration of THC. Mixing THC oil with other oils, flavorings, and cannabinoids helps decrease the euphoric effects and THC potency. To avoid the potential psychological side effects of THC oil, many patients prefer to use CBD, though CBD may not be as effective for some ailments.