Customers should always request third party lab results that test for potency, pesticides, residual solvents, and mycotoxins of the CBD hemp oil. If a company is reluctant to share these results with you, it should automatically be a red flag and indicate that they have something to hide. We’ve done the work and checked if these brands offer those tests to their customers. We’ve assigned a letter grade of C, B, A, or A+ based on what kind of lab results are offered to customers. All the brands on this list at least offer tests showing the levels of CBD and THC in them (with THC under the legal limits for hemp of 0.3%), but brands which go further are rated higher.

This review paper on the safety and side effects of cannabidiol by the NCBI, for example, suggests that controlled cannabidiol administration is safe and non-toxic in humans and animals. It also does not induce changes in food intake, nor does it affect physiological parameters like heart rate, body temperature or blood pressure. Also, according to this review paper, “high doses up to 1,500 mg/day of CBD are reportedly well tolerated in humans.”
Transparency: cbdMD seems to be going through a transition with their third-party testing practices. Until recently, they only released a lab report for the CBD concentrate they use for all their products, but would not show potency testing for individual products. That seems to be changing. Currently, the only lab report on the website is for their concentrate (and it’s over a year old). But if you contact customer service, they’ll send you a lab report for any product. 
Schizophrenia. Research on the use of cannabidiol for psychotic symptoms in people with schizophrenia is conflicting. Some early research suggests that taking cannabidiol four times daily for 4 weeks improves psychotic symptoms and might be as effective as the antipsychotic medication amisulpride. However, other early research suggests that taking cannabidiol for 14 days is not beneficial. The conflicting results might be related to the cannabidiol dose used and duration of treatment.
Cannabidiol is a chemical in the Cannabis sativa plant, also known as marijuana or hemp. Over 80 chemicals, known as cannabinoids, have been identified in the Cannabis sativa plant. While delta-9-tetrahydrocannabinol (THC) is the major active ingredient in marijuana, cannabidiol is also obtained from hemp, which contains only very small amounts of THC.
A research study posted to Addictive Behaviors shows that cannabidiol oil helps in treatment for substance abuse. According to the study, continued use of cannabidiol oil helped reduce tobacco consumption when used for 1 week. The participants in the research study randomly picked a placebo or CBD. They were then urged to use what they had picked whenever they felt like taking a cigarette. The participants with the placebo didn’t experience any decrease as opposed to the particiapnts who took CBD and decreased cigarette consumption by about 40%.
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