Decoctions, made from such things as herbal roots and bark, are boiled in water to release their active ingredients.
परंतु, तज्ज्ञांच्या मते, चहा तयार करण्यासाठी वापरल्या जाणाऱ्‍या औषधी वनस्पती पाण्यात घालून उकळू नयेत.