{"brand":"Compound Laws","url":"https://compoundlaws.com/compounds/endomorphin-1/massachusetts/","compound":{"slug":"endomorphin_1","name":"Endomorphin-1","same_as":"https://en.wikipedia.org/wiki/Endomorphin"},"jurisdiction":{"code":"MA","name":"Massachusetts"},"as_of":"2026-07-18","answer":"As of July 18, 2026, Endomorphin-1 is legal to sell at retail in Massachusetts. Unscheduled - legal as research-use-only; no operative instrument reaches a structurally-dissimilar opioid peptide. Controlling source: M.G.L. c. 94C 1 (controlled substance analogue).","forms":[{"form":"all","label":"All forms","status":"legal","state_status":null,"federal_overlay":false,"headline":"Unscheduled - legal as research-use-only; no operative instrument reaches a structurally-dissimilar opioid peptide","rule_type":"permanent","tier":"unscheduled","schedule_class":null,"limit":null,"effective_date":null,"verified_at":"2026-07-18","confidence":"confirmed","verbatim_excerpt":"M.G.L. c. 94C 1: a \"drug or substance with a chemical structure substantially similar to the chemical structure of a controlled substance in Class A, B, C, D or E ... AND which has a stimulant, depressant or hallucinogenic effect on the central nervous system that is substantially similar to or greater than ...\" [Conjunctive - structure prong fails.]","excerpt_source_url":"https://malegislature.gov/Laws/GeneralLaws/PartI/TitleXV/Chapter94c/Section1","citations":[{"title":"M.G.L. c. 94C 1 (controlled substance analogue)","url":"https://malegislature.gov/Laws/GeneralLaws/PartI/TitleXV/Chapter94c/Section1","pinpoint":null,"publisher":"Massachusetts Legislature","type":"statute","primary":true,"official":true},{"title":"M.G.L. c. 94C 1 (opiate def)","url":"https://malegislature.gov/Laws/GeneralLaws/PartI/TitleXV/Chapter94c/Section1","pinpoint":null,"publisher":"Massachusetts Legislature","type":"statute","primary":false,"official":true}],"history":[]}],"neighbors":[{"code":"CT","status":"legal"},{"code":"NH","status":"legal"},{"code":"NY","status":"legal"},{"code":"RI","status":"legal"},{"code":"VT","status":"legal"}],"laws":[{"citation":"M.G.L. c. 94C § 31, Class C(e) (does NOT name it); analog reach via the \"controlled substance analogue\" definition in c. 94C § 1.","title":null,"official_url":"https://malegislature.gov/Laws/GeneralLaws/PartI/TitleXV/Chapter94C/Section31","source_label":"OFFICIAL","effective_date":null,"retrieved_date":"2026-06-19","text_hash":"bb9414240b38bb19978ad669727ae168445bb857899fd44428704c1e674227ec"},{"citation":"Mass. Gen. Laws ch. 94C, Sec. 1 (Controlled Substances Act; Definitions)","title":"Definitions -- 'Controlled substance analogue' (and related 'Controlled substance', 'Tetrahydrocannabinol', and 'Marihuana' definitions)","official_url":"https://malegislature.gov/Laws/GeneralLaws/PartI/TitleXV/Chapter94C/Section1","source_label":"OFFICIAL","effective_date":null,"retrieved_date":"2026-07-02","text_hash":"9a0f4c5c022d2a017e61bbbc952a49595112797b885de49649ff5f106ae02c27"},{"citation":"Mass. Gen. Laws ch. 94C, Sec. 1 (definition of 'Controlled substance analogue')","title":"Controlled Substances Act - Definitions - controlled substance analogue","official_url":"https://malegislature.gov/Laws/GeneralLaws/PartI/TitleXV/Chapter94C/Section1","source_label":"OFFICIAL","effective_date":null,"retrieved_date":"2026-07-20","text_hash":"96ef8a86f5adb52cbbebd4b47c071794422e6655589e147b106eaa9513b8a40d"}]}