By Pat Anson, PNN Editor

There is little evidence that cannabidiol (CBD) products relieve chronic pain and some could be potentially harmful to patients, according to UK and Canadian researchers.

CBD is one of the chemical compounds found in cannabis, but it doesn’t have the same intoxicating effect as tetrahydrocannabinol (THC), the psychoactive ingredient in marijuana. Often marketed as a pain reliever, CBD can be purchased in edibles, beverages, lotions, oils and other products, usually without a prescription.  

“CBD presents consumers with a big problem,” says lead author Chris Eccleston, PhD, Professor of Pain Science at the University of Bath in the UK. “It’s touted as a cure for all pain but there’s a complete lack of quality evidence that it has any positive effects.

“There should be no excuses for misleading the public, and yet it is likely that the public is being misled and possibly placed in harm’s way.”

Eccleston and his colleagues reviewed the results of 16 high-quality clinical trials of CBD products, involving over 900 participants. Their findings, published in in The Journal of Pain, show that CBD provided little or no pain relief in 15 of the 16 studies. The one small trial that did showed improvement in arthritis pain after two weeks of treatment with a topical CBD lotion.

Just as concerning to researchers is that many CBD products sold directly to consumers have significantly more or less CBD than what their labels indicate. Some CBD products also contain THC, when they weren’t supposed to have any.

“There is no good reason for thinking that CBD relieves pain, but there are good reasons for doubting the contents of CBD products in terms of CBD content and purity,” Eccleston wrote. “Regulatory authorities should also take note of the considerable deficiencies existing in the products sold, especially the incorrect labeling of many products, and possible contamination with psychoactive compounds.”

The researchers say regulators in the US, UK and Canada are often slow to respond to the false medical claims of some CBD manufacturers. The FDA occasionally sends warning letters to companies making unsubstantiated claims about CBD, but it rarely results in fines or disciplinary action.

“What this means is that there are no consumer protections,” said co-author Dr Andrew Moore, Director of Pain Research at the University of Oxford. “And without a countervailing body to keep the CBD sellers in check, it’s unlikely that the false promises being made about the analgesic effects of CBD will slow down in the years ahead.”

In a recent review, the FDA said there was “credible scientific support” for cannabis as a pain reliever and recommended that the DEA reschedule it as a Schedule III controlled substance. Such a move would make it legal under federal law for cannabis to be prescribed for medically approved conditions, but would have no impact on CBD products.

In 2022, FDA Commissioner Dr. Robert Califf asked Congress to give his agency the authority to more closely regulate CBD, but no such legislation has been passed. Eccleston says its part of a pattern in which pain sufferers are neglected and left on their own to find relief.

“It’s almost as if chronic pain patients don’t matter, and that we’re happy for people to trade on hope and despair,” he said.