HHC-O is, in short, an acetate version of hexahydrocannabinol. Hexahydrocannabinol (HHC) is a minor cannabinoid found in the seeds and pollen of the hemp plant, which is a hydrogenated form of THC.
Meanwhile, the “-O” portion of its name means that it’s been blended with acetic anhydride to boost its potency and essentially turn it into “super HHC”.