mg/mL

mg/mL expresses mass concentration of a cannabinoid in a liquid product — tinctures, sublingual oils, vape oils, cannabis beverages, and prescription products (Sativex/nabiximols, Epidiolex). It enables precise volumetric dosing: a 30 mL tincture labeled "20 mg/mL THC" contains 600 mg total, with each 1 mL dropper delivering 20 mg. ASTM D8270 (Terminology) and ASTM D8449 (Label Content and Style for Consumer Products Containing Cannabinoids) formalize mg/mL as the preferred concentration unit for liquid cannabinoid products. Health Canada's Cannabis Regulations similarly require mg/mL declarations on cannabis extract labels, alongside per-container totals. mg/mL is unambiguous and preferred over "%" for liquids. Citations: ASTM D8449; ASTM D8270; Canada Cannabis Regulations (SOR/2018-144) labeling provisions.