||||||||||ZYN001 / Zynerba, LTS Lohmann Therapy Systems Clinical, Journal: A Secondary Analysis from a Randomized Trial on the Effect of Plasma Tetrahydrocannabinol Levels on Pain Reduction in Painful Diabetic Peripheral Neuropathy. (Pubmed Central) - Nov 6, 2021 These findings stress the importance of measuring cannabinoid plasma levels when performing future research. PERSPECTIVE: This analysis correlating plasma THC levels and pain reduction in diabetic neuropathy suggest a therapeutic window. Low and high THC levels had a negative association (no reduction) and THC levels within the window had a positive association (reduction). There was a minor negative linear effect of THC on cognitive function.