Plants are a source of phytochemicals, molecules created by Nature. Much research has been done over the years and 25% of actual medicine drugs are of plant origins.
Scientific articles, reports, and publications are these days freely available on the web.
Throughout history information on plants has been collected in Pharmacopeiae and other professional writings. Well known traditional medical systems around the world like Western, Ayurveda (India), Chinese, Kampo (Japan), Greco-Arab and Islamic, Unani/Tibb (South Asia) are primarily sourced from plants. France and Germany are using plants as complementary and alternative medicines.
Throughout history information on plants has been collected in Pharmacopeiae and other professional writings. Well known traditional medical systems around the world like Western, Ayurveda (India), Chinese, Kampo (Japan), Greco-Arab and Islamic, Unani/Tibb (South Asia) are primarily sourced from plants. France and Germany are using plants as complementary and alternative medicines.
Publications on PubMed
references on American Botanical Council
mentiones in Traditional medicines in Asia (WHO)
references on webmed
Herbal teas, also called tisanes, simply defined, are beverages obtained from pouring hot water on different parts of a plant. Scientifically, they are aqueous extracts of a plant.
At 100°C the water viscosity is decreased, resulting in a better penetration of the solvent in the matrix of the plant cell. The hot water increases the solubility of the cell compounds, hence increasing the mass transfer and subsequently the extraction rate. Easily said, hot water helps the extraction of compounds from the plant.
Each herbal tea has its own virtues and these added on top of the benefits of drinking water. A cause of illness and fatigue is the lack of what we in the western world often take for granted: water.