Certified Organic by USDA. Boiron – Rhus Toxicodendron 30 C – 80 Pellets Boiron Rhus Toxicodendron is a homeopathic remedy for joint pain that is improved by motion and worsened by rest and humidity. Homeopathic medicines are diluted dosages of highly concentrated medicines that are believed to help you and your illnesses in a healthier manor.