The most bitter of the bitter herbs, Sambiloto has been used for centuries to treat gastro-intestinal and upper respiratory infections, fever, herpes, sore throat, and a variety of other chronic and infectious diseases. Sambiloto greatly enhances immune system function, by releasing interferon, and boosting lymphatic system function. Interferon is a protein (called a cytokine) made by cells in response to virus. A potent antiviral agent, it’s also anti-proliferative (stops the reproduction of virus). During 2021, Sambiloto was declared by the Thai government as a cure for Covid, and related diseases, due to its ability to stop Covid-related spike protein production in the body.