You can’t always trust claims that are made. Look for products that have been tested by a third-party laboratory and have the reports available, usually on the company website. These lab reports should tell you if the product’s claimed CBD content is accurate, that it contains less than .3 percent of THC (the legal limit), and if there are any other harmful contaminants like heavy metals or bacteria in the sample. These Certificates of Analysis (COA) should show that the testing was done within the past 10 to 12 months at an International Organization for Standardization-accredited lab. Consumer Reports suggests looking for products made in states that have legalized medical use of cannabis, because they typically have stricter standards for farming and manufacturing.