CBD oil is a viscous liquid derived from the hemp plant. The hemp flower contains trichomes, which are glands that contain essential oils, terpenes, and phtyocannabinoids. There are many ways to extract oil from the plant, including CO2 extraction and solvent-based extraction. Ethanol extraction is the most common solvent used because it is efficient in extracting hemp oil, and is easily distilled off to produce pure hemp oil. CO2 extraction methods employ a combination of temperature and pressure to extract hemp oil from the plant. The resultant oil produced by both extraction methods contain numerous phytocannabinoids, terpenes, vitamins and amino acids. Some hemp oils may have slight color differences, which is usually a result of variation in crop environment, extraction techniques used, or different carrier oils used in the specific formulation. The current widely-accepted hypothesis is that the complete, or full-spectrum, combination of phytocannabinoids in hemp oil creates an “entourage effect”, where the mixture of cannabinoids has a greater therapeutic benefit than CBD alone.