A soothing gel for massaging it to bruised areas Arnica is probably the most well known remedy in Homeopathic practice, where it is highly regarded for its soothing properties. Combined with Witch Hazel and MSM, NAF Arnica Gel has a cooling and soothing effect on muscles and joints. NAF Arnica Gel should be massaged into areas that show ‘bruise-like’ soreness after muscular exertion, or following a knock or blow, such as a kick from another horse.