Can CBD minimize some of the negative effects of marijuana?

According to new research from the Institute of Psychiatry, Psychology & Neuroscience (IoPPN) at King's College London, no, it can’t.

The study, published in Neuropsychopharmacology examined whether marijuana with higher levels of CBD can protect consumers from psychotic experiences and memory problems, reported Medical Express.

Research Summary

Forty-six healthy volunteers participated and completed a randomized and double-blind trial. There were four experiments, and in each, every participant inhaled marijuana vapor with 10mg of THC and a different level of CBD (0mg, 10mg, 20mg, or 30mg).

After that, they had to perform several tasks, fill out questionnaires and complete interviews created to assess the effect on their cognitive abilities, the severity of psychotic symptoms, and how pleasurable the marijuana experience was.

Previously the same study confirmed that pre-emptively taking a high dose of CBD in a capsule several hours before weed could reduce the adverse effects of THC.

The new research revealed that the higher dose of CBD didn’t notably change the effect of THC on cognitive performance, psychotic symptoms, or how enjoyable the experience was.

"None of the CBD levels studied protected our volunteers from the acute negative effects of cannabis, such as anxiety, psychotic symptoms, and worse cognitive performance,” Dr. Amir Englund, a research fellow at King's IoPPN and the …

Full story available on