‘Cannabinoids’ is a broad term covering a group of natural products from Cannabis sativa, one of which locks on to specific receptors – protein molecules on the surface of cells – known as cannabinoid receptors. Over the past decades scientists have found that cannabinoid receptors and their endogenous ligands, the endocannabinoids, are involved in a vast array of physiological functions, including helping to control brain activity, energy metabolism, heart function, the immune system and even...