As its name suggests, CBN is related to THC, the compound being in fact a metabolite of tetrahydrocannabinol. This means that cannabinol is obtained from THC, through a process that involves both natural and special treatments.
Unlike other cannabinoids, CBN does not stem directly from cannabigerol (CBG) or cannabigerolic acid (CBGA), but rather is the degraded product of tetrahydrocannabinolic acid (THCA).If cannabis is exposed to air or ultraviolet light (for example, in sunlight) for a prolonged period of time, THCA will convert to cannabinolic acid (CBNA). CBN is then formed by decarboxylation of CBNA.