Cupronickel or copper-nickel is an alloy of copper that contains nickel and strengthening elements, such as iron and manganese.
Despite the low risk of side effects, it's important to take caution when using Oscillococcinum in treatment of the flu. Because the flu virus can lead to complications like pneumonia (a potentially life-threatening condition), you should seek medical attention if you experience flu symptoms such as coughing, sore throat, muscle aches, fatigue, headache, and high fever.
In clinical studies, side effects of curcumin included nausea and diarrhea. When applied to the skin, irritation and allergic reactions may occur. (This article covers many, but not all, of the possible side effects with curcumin.