Nature’s Script also sells a pet CBD tincture in 150mg, 300mg, and 1,000mg concentrations. As a general rule of thumb, low-concentration oils are a good option for smaller dogs while larger concentrations may be more suitable for larger breeds – but pet owners should always check with their vet beforehand. In addition to standard shipping, Nature’s Script offers expedited delivery for customers in the contiguous U.S.
Sativex, a cannabis plant–derived oromucosal spray containing equal proportions of THC and CBD, has been approved in a number of countries for use to treat specific types of pain. Numerous randomized clinical trials have demonstrated the safety and efficacy of Sativex for treatment of central and peripheral neuropathic pain, rheumatoid arthritis, and cancer pain. 
Researchers like Blessing are legitimately excited about CBD. It shows real promise in treating previously intractable disorders like schizophrenia, and without the destructive side effects of existing drugs. Still, that doesn’t mean CBD is harmless. Research on drug interactions with CBD is in its infancy, but what is known within the medical community is that CBD can cause serious problems for people taking certain classes of drugs, namely SSRIs (a group of antidepressants including Zoloft and Prozac) and opioids.
But, uh, what is it that CBD is supposed to do? I visited a cannabis dispensary in Boulder to find out what the hype was all about. After passing an ID check, I was introduced to a “budtender” who pointed me to an impressive array of CBD products — tinctures, skin patches, drink powders, candies, salves, massage oil, lotions, “sexy time personal intimacy oil” and even vaginal suppositories to treat menstrual cramps.
However it’s classified, Cannabis ruderalis is naturally low in cannabinoids. Its real value lies in its genetics. While Cannabis indica and sativa flower based on how much light they get (the photoperiod), Cannabis ruderalis is what’s called an autoflowering strain. That means it reaches maturity—usually in 20 to 30 days—regardless of the light cycle.
Selective breeding of cannabis plants has expanded and diversified as commercial and therapeutic markets develop. Some growers in the U.S. succeeded in lowering the proportion of CBD-to-THC to accommodate customers who preferred varietals that were more mind-altering due to the higher THC and lower CBD content. Hemp is classified as any part of the cannabis plant containing no more than 0.3% THC in dry weight form (not liquid or extracted form).