Since CBD is not regulated by the government, and lab testing is not required in every state, products can be unreliable in delivering a consistent amount and the purity or the dosage listed is not always dependable. Research is limited regarding how the chemical compound impacts the brain, is metabolized by the liver, and interacts with other medications.
Many small-scale studies have looked into the safety of CBD in adults. They concluded that adults tend to tolerate a wide range of doses well. Researchers have found no significant side effects on the central nervous system, the vital signs, or mood, even among people who used high dosages. The most common side effect is fatigue, and some people also report diarrhea and changes in appetite or weight.