"We see really great interest amongst seniors," says Martin Lee, director of the Northern California nonprofit Project CBD, which promotes the use of the compound as a natural alternative to traditional forms of drug therapy. Mikhail Kogan, M.D., medical director of the George Washington University Center for Integrative Medicine, has prescribed CBD for his patients since the compound was legalized for medical use in the District of Columbia in 2011. Kogan says cannabinoids are "safer than Tylenol or caffeine by tenfold. If you compare them to opiates, they're about 10,000 times safer." He recommends placing a few drops of the oil under the tongue. All cannabis is illegal on the federal level. But cannabis-based CBD products with THC are widely available in states where it is legal. These products have varying ratios of CBD to THC, and because there are no official medical guidelines on dosage, patients are left to determine for themselves how much to take or how to modify their ratio. For those in states where it is not legal, however, the CBD available is derived from industrial hemp, which is cannabis with a negligible amount of THC. This makes it impossible to modify the ratio as there is no THC present, which means there are fewer products to choose from. And since there is no FDA approval of these products, it can be hard to trust that what you're buying actually is what's advertised. get TerraPro CBD’s cost is not uniform either. Depending on the dosage, strain and dispensary, it can cost from $100 to $1,000 a month. In California, for example, there is a 15 percent excise tax, plus an additional cultivation tax, which means a $50 bottle of CBD oil can cost about $65.