Case report of a life-threatening cardiac arrhythmia following the use of hemp oil and the addition of the supplement berberine. Herbal supplements can have serious adverse side effects on their own or if combined with other supplements or medications.

Resources:

https://www.eurekalert.org/news-releases/952409

https://www.heartrhythmcasereports.com/article/S2214-0271(22)00062-8/fulltext#%20