HHC was first created in 1944 by the American chemist Roger Adams, when he added hydrogen molecules to Delta-9 THC. This process, known as hydrogenation, converts THC to hexahydrocannabinol (HHC).
Hydrogenation isn’t limited to cannabinoid production. A similar process is used to convert vegetable oil to margarine.
While Adams created HHC from conventional cannabis-derived THC, these days the cannabinoid is typically derived through a process that begins with hemp, the low-THC cannabis plant that was made federally legal by Congress in the 2018 farm bill.