Are there any precautions to be taken when using iron supplements to treat iron deficiency? The cause of the problem has been successfully treated, but now I'm on 300mg 3x daily to bring my levels back up, and it is slowly getting better. I've been on these for a month, and anticipate being on them for another month. Are there any reasons to take/not take more? I'd like to remedy this as quickly as possible, but not take more iron daily than is going to be absorbed, or do any harm.