Delta-8 vs. Delta-9 THC: Chemistry & Pharmacology Δ9-THC (“delta-nine”) is the principal psychoactive compound associated with cannabis. By default, when we talk about “THC” we mean delta-9 THC. “Delta-eight” (Δ8-THC) is a nearly identical compound. In the language of chemistry, it’s an isomer of delta-nine-THC–the same number of atoms of each element. As isomers, delta-8 […]

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