- current use of any of the following herbal medications: Boswellia, Cat's claw (Uncaria tomentosa), Cayenne pepper, Echinacea, Horsetail (Equisetum), Hops, Lady's mantle (Alchemilla), Marshmallow root (Althaea), Slippery elm (Ulmus rubra) Turmeric and White Willow (Salix alba)