What Are the Risks of CBD?
With the benefits of CBD mounting as increasing research is conducted and published, the logical question becomes one of safety. Are there risks to CBD for the average person with the average range of CBD dosages?
A recent study gave up to 6000 mg of CBD to healthy subjects, finding it well tolerated and the side effects mild and limited to gastrointestinal distress, nausea, somnolence, headaches, and diarrhea. For comparison’s sake, keep in mind that a typical dose of CBD is often 20 mg.
Mouse research indicate that extended high-dose CBD (15-30 mg/kg of bodyweight, or 1200-2400 mg per day for an 80 kg man) might impair fertility. Male mice who took high-dose CBD for 34 days straight experienced a 76% reduction in testosterone, reduced sperm production, and had dysfunctional weird-looking sperm. In the 30 mg/kg group, the number of Sertoli cells—testicular cells where sperm production takes place and sperm is incubated—actually dropped. Male mice taking CBD also were worse at mounting females and had fewer litters.
Those are really high doses. For epilepsy, a common dose is 600 mg/day, and that’s for a severe condition. Most other CBD therapies use much smaller doses in the range of 20-50 mg/day. Long-term safety may still be an issue at these lower doses, but we don’t have any good evidence that this is the case.
There’s some evidence that the dosages of CBD required to achieve anti-inflammatory effects are also high enough to induce cytotoxicity in healthy cells, though that’s very preliminary in vitro (petri dish) research and as of yet not relevant to real world applications. Time will tell, though, as the legal environment opens up and we accumulate more research.