Bao tho tea prepared from black tea, stevia rebaudiana Bertonia and phylamin (a herbal preparation). A study on the bioactivity of Bao tho has shown that Bao tho tea had no acute or chronic toxicity, had a sedative effect and recovering the health. The preparation reduced the blood cholesterol concentration from 155 to 131mg%. Its coefficient of alpha radioactive protection was 0.33. The Bao tho tea supported the health of old soldiers in the nursing friendship village.
Resources of herbal plants with aromatic oil at the biodiversity station of Ngoc Thanh commune, Me Linh district, Vinh Phuc province