High-Dose CBD Extract Activated Liver Enzymes in Mice, but a Common Supplement Didn't Make It Worse

Eight-week-old male C57BL/6J mice received either MSM in drinking water (80 mg/100 mL) for 17 days, CBD-rich cannabis extract by oral gavage (123 mg/kg/day for 3 days), both, or neither. Liver enzyme expression measured via RT-PCR. Liver toxicity assessed via histology and serum markers.

CBD products are increasingly used alongside supplements, but almost no research has examined these combinations. This study addressed one specific pairing and found no added harm, which is reassuring. But the broader finding — that CBD alone powerfully induces the same liver enzymes that process prescription drugs — reinforces that CBD is not pharmacologically inert. Anyone taking CBD alongside medications should be aware of this.

This is one of a growing number of studies (alongside RTHC-00059 and RTHC-00070) showing that cannabinoids meaningfully interact with the liver enzyme systems that process most medications. The good news here was that MSM was safe to combine with CBD. The broader question — which of the hundreds of supplements people take alongside CBD are safe — remains almost entirely unanswered.

Mouse model with high CBD doses that may not reflect typical human consumption. Only one supplement tested. Only male mice used. Short treatment duration (3 days of CBD). The extract contained other cannabinoids besides CBD, so effects cannot be attributed to CBD alone.