What is CBD Oil? Pure CBD oil is extracted from the hemp plant and taken as a tincture. It’s been used widely in clinical studies. You take it by applying a few drops under your tongue using a stopper. Holding the oil under your tongue for at least 30 seconds before swallowing helps the CBD assimilate directly into your bloodstream. CBD oil for sale in all 50 states contains less than 1% THC and comes at varying concentration levels. Some CBD hemp oil products have added flavorings, while others aim for purity. The best CBD oil has a high concentration of CBD and contains no additives that diminish the health benefits of the product. Full-spectrum CBD oil includes other cannabinoids from the hemp plant besides CBD, such as fatty acids, chlorophyll, flavonoids and terpenes. These may add additional therapeutic benefits, or potentially increase the effects of the CBD compound.