Ferrum carbonicumFerrous Carbonate. FeCO3
Homeopathic remedies are prescribed on the basis that in a tiny dilution like cures like, so while very dilute Ferrum carbonicum may help, unprocessed Ferrum carbonicum is often best avoided.
Below are the strongest indications (i.e. symptoms) of Ferrum carbonicum in traditional homeopathic usage, not reviewed by the FDA.