Inclusion Criteria  English speaking DSM5 diagnosis of opioid use disorder Receiving buprenorphine or methadone for treatment of opioid use disorder Agreeable to abstaining from using any cannabis or CBD products for the duration of the trial.  Exclusion Criteria:  Any self-reported use of cannabis or CBD products in the past 30 days Baseline depression (PHQ9) or anxiety (GAD7) scores of greater than 10 Currently pregnant Hepatic liver enzymes greater than 3x upper normal limit Hypersensitivity to cannabinoids or sesame oil (CBD solution comes in sesame oil emulsion) Currently taking any medications with known significant pharmacokinetic interactions with CBD