What is St John’s Wort Essential Oil (Absolute)? St John’s wort essential oil, or absolute, is a natural volatile substance that contains the active ingredients of the plant Hypericum perforatum. The essential oil of St John’s wort generally is obtained by two different methods: CO2 or Steam Distillation. Research has shown that essential oil extraction efficiency with liquid or supercritical CO2 (yield 1.00%, w/w) is higher than with steam distillation (0.06%, w/w). Hyperforin (a main compound in the essential oil) […]
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