CBD caused developmental delays in worm models but at doses far above human recommendations

CBD delayed developmental milestone acquisition irreversibly when exposure began at the onset of feeding, while locomotor effects were reversible after removing CBD. Purified CBD was slightly more toxic than matched CBD concentrations in hemp extract across all endpoints. Juveniles were more sensitive than adults.

C. elegans nematodes were exposed to purified CBD or hemp extract in sesame oil emulsions. Researchers measured oxidative stress response, developmental timing, locomotor activity, reproductive output, and organismal CBD concentrations across juvenile and adult life stages.

As CBD products become more widely available, understanding their effects on development and reproduction is important. This study flags that early-life CBD exposure may cause irreversible developmental effects, even if adult effects are reversible.

CBD is increasingly consumed as a supplement, but developmental toxicology data remain limited. While these worm-model findings cannot be directly applied to humans, they highlight that timing of exposure matters and that developing organisms may be more vulnerable than adults.

C. elegans is an extremely simple model organism. Doses causing adverse effects far exceeded human recommended levels. The sesame oil vehicle acts as a high-fat diet in C. elegans, which complicates interpretation. Translation to mammalian development is uncertain.