The amount of CBD needed to produce significant effects varies by condition, according to both Blessing and Carson. “In clinical trials for schizophrenia they would give 800 milligrams,” says Blessing. “In our clinical trial to treat PTSD, we are giving 600 mg per day.” In the clinical trial for Epidiolex, Carson says, the clinicians administered 10 milligrams per kilogram the subject weighed — meaning a person who weighs 50 kilograms (or 110 pounds) would be given 500 milligrams of CBD.
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Other studies have been done in lab animals, or in vitro (meaning in a test tube, using animal brain tissue). Those studies have found anxiety-reducing effects but only at midlevel dosages, in the range of 10 to 20 mg per kg. As an example, one study found that CBD can, in rats, be an effective anti-inflammatory painkiller — at 20 mg per kg. It’s not a direct translation, but that dosage would be somewhere in the range of several hundred milligrams for an adult human.
The final advantage in the above list of a lower cost per milligram is one worth looking into further. As previously mentioned, because a full spectrum product is derived from a whole plant ex-tract it typically costs more (you the consumer are getting more than just CBD). Chase Terwilliger, CEO of CBDistillery, adds, "It is less expensive to manufacture isolate-based products com-pared to full-spectrum products. Rather than taking advantage of a larger margin, we decided to pass the savings along to the consumers." For those looking for a pure CBD product, you will al-so be delighted to find that CBD oil made from isolate is typically less expensive than a full-spectrum product. Which brings up a final point which is to do your research on the industry standard pricing for cost per milligram to ensure you are not paying an unnecessary premium.

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