The law on hemp-based products in the United States has evolved a lot in recent years. The federal farm bill of 2014 permitted the sale of hemp products, providing that the psychoactive content of these products (i.e. the amount of THC) was below 0.3 percent. That’s why you so often see references to products being either “THC-free” or containing less than 0.3 percent.
So how does it work? Scientists are still working out the details of how CBD works to calm the mind, though it seems that its effects on serotonin and glutamate production are part of that equation. This comprehensive 2015 review of scientific literature on CBD as a potential treatment for anxiety concluded that CBD has considerable potential and strongly recommended further study. cbd oil