Round, rust-colored tablet, no markings. prescription. I want to know if the FE is iron, if the C is Vitamin C and if the B-1 means it also contains B1 ## The FDA lists it as containing iron and vitamin C, since vitamin C helps your body absorb the iron better. It is used to treat, or prevent an iron deficiency, which could result in a dangerous anemic condition. They also warn that it may cause stomach irritation, dark stool, and constipation as side effects. Is there anything else I can help with?