Pregnenolone monosulfate (3β-Hydroxy-5-pregnen-20-one monosulfate) is a powerful neurosteroid, the main precursor of various steroid hormones including steroid ketones. Pregnenolone monosulfate acts as a signaling-specific inhibitor of cannabinoid CB1 receptor , inhibits the effects of tetrahydrocannabinol (THC) that are mediated by the CB1 receptors . Pregnenolone monosulfate can protect the brain from cannabis intoxication . Pregnenolone monosulfate is also a TRPM3 channel activator, and also can weakly activate TRPM1 channels.