11-OH-Δ9-THC is the first break-down product of THC. 11-OH-Δ9-THC is more psychoactive than THC and is degraded faster but the pharmacology and therapeutic properties of 11-OH-Δ9-THC are still under investigation.

11-COOH-Δ9-THC is a secondary break-down product of THC. 11-COOH-Δ9-THC is not psychoactive and is slowly degraded. The exact physiological functions or therapeutic properties of 11-COOH-Δ9-THC are still under investigation.