Canna~Fangled Abstracts Are cannabidiol and Δ9 -tetrahydrocannabivarin negative modulators of the endocannabinoid system? A systematic review. 2014 Sep 26. doi: 10.1111/bph.12944. Are cannabidiol and Δ9 -tetrahydrocannabivarin negative modulators of the endocannabinoid…Freedom WaresSeptember 26, 2014