My sons cold hands and feet improved with Swansons Echinacea. His cold hands and feet eventually turned into a circulation problem. you can also team up echinacea and goldenseal for one week. Swanson do a good goldenseal product. Milk thistle is a great liver detoxer. Swanson Echinacea can be used for up to 8 weeks according to their label, it has helped my sons cold hands and feet a lot, it is an immune booster.