Niccolum Metallicum is a homeopathic remedy which is used against colds.
Used to help in the following conditions:
• poor concentration
• poor mood
• restless sleep
• muscle pain
No side effects are known
None are recorded.
Source: Webhomeopath, http://www.webhomeopath.com/homeopathy/homeopathic-remedies/homeopathy-remedy-Niccolum_Metallicum.html