Pure CBD

Use a solventless system. This ensures a safe extract is produced, free from any residues or additives—which is often not the case with other extraction methods.

Avoid CBD oils made using chemicals like propane, butane, pentane, or hexane as they can leave behind dangerous contaminants.

Hemp is a "hyperaccumulator" plant. That fancy word simply means hemp readily absorbs everything from the soil it grows in. What it absorbs can be useful, like vitamins and minerals, or harmful, like lead, petroleum, and toxic chemicals.

The safest CBD oil will be sourced in an area where the government requires farmers to be certified and have their fields frequently tested for toxic substances. The oil itself should be tested by an accredited lab to make sure it doesn't contain pesticides, heavy metals, bacteria, fungus, solvent residue, or any other foreign matter.

Good CBD oil made by a reputable company will tell you how much CBD you're getting right on the label. Look for either the concentration or the total number of milligrams in the bottle. Higher numbers mean a more potent product. To be considered effective, CBD oils should contain 250–1000 mg’s per 10ml bottle. Anything less and you're wasting your money.

CBD oils made from whole-plant extracts, also called full-spectrum oils, are generally considered to be of higher quality than those made from CBD isolates.

The idea of an isolate sounds good; it's pure CBD, but it's often made from cheap materials and lacks the other cannabinoids, flavonoids, and terpenes that work in partnership with CBD. It's when these elements exist together that they become more effective, so full-spectrum extracts are a must.

CBD oils made from hemp may contain trace amounts of THC—usually 0.2% or less—but it's not nearly enough to get you high. However, sub-standard processing can boost the levels of THC to a degree that creates psychotropic effects. Not only is this a sign of a low-quality product, but it could even make the CBD oil illegal where you live. Check the labels and lab reports for exact figures before you make a purchase.

 Before buying CBD oil, check to see if the company has its products verified by independent testing facilities. A company you can trust will make these results public. The information might be on the bottle, the box it came in, on an insert, or published on the website. If you can't find it there, then it is time to start asking questions. Most companies with consistently good results are so proud of them that they'll make the  them available for all to see.