What is Hexahydrocannabinol (HHC)? Preliminary pharmacokinetic and psychophysical investigations after controlled oral and inhalative consumption of hexahydrocannabinol (HHC) Scientific Reports Malta has officially banned the sale and distribution of HHC (Hexahydrocannabinol), a synthetic cannabinoid marketed as a legal alternative to THC. HHC emerged recently, exploiting legal loopholes, and posing significant risks to Does HHC Show Up on a Drug Test? (Urine, Blood & Hair Windows) HHC now illegal in Ireland: What Employers need to know Randox Testing Services Does HHC Show Up on a Drug Test? (Urine, Blood & Hair Windows)