Heart Vine(Tinospora cordifolia) is a tropical herb used by the Indian Ayurvedic natural medicine system. You might be able to find it on the internet or in a local Indian grocers or deli. Generally, heart vine is found in some Ayurvedic preparations such as Triphala, Chaywanprash etc. -- and Heart Vine is called "Guduchi" or "Giloy" in various Indian dialects.