Herbal tea pharmacies have come up with their products using different combinations of Ayurvedic medicines. Ayurvedic tea has also been found to contain nutrients including calcium, potassium, vanadium, iron, manganese, selenium and zinc. Herbal tea Herbal teas — less commonly called tisanes (UK and US , US also ) — are beverages made from the infusion or decoction of herbs, spices, or other plant material in hot water. They do not usually contain caffeine. Herbal teas should not be confused with true teas (e.g., black, green, white, yellow, oolong), which are prepared from the cured leaves of the tea plant, "Camellia sinensis"),
Camellia sinensis there is no high-quality evidence that tea confers significant benefits. In clinical research over the early 21st century, tea has been studied extensively for its potential to lower the risk of human diseases, but none of this research is conclusive as of 2017. Caffeine is a molecule produced in "Camellia sinensis" and functions as a secondary metabolite. Caffeine is a purine alkaloid and its biosynthesis occurs in young tea leaves and is regulated by several enzymes. The biosynthetic pathway in "C. sinensis" differs from other caffeine producing plants such as coffee or guyausa. Analysis of the pathway was carried out