Ainsworths-Arnica 30C Homoeopathic Remedy (120 tablet) Ainsworths Arnica 30c is a homeopathic medicinal product in a 30c potency. Homeopathy is the most natural form of healing. The remedies are chosen to stimulate your body to cure itself and fit the person as well as complaint, as we are all unique. It is a very safe form of medicine.