Iron Iron rda vs. absorption

Patient : I see that the rda for iron is 8mg/day for males in my age group. Does that mean that I should be consuming 8mg per day from all sources, or does that mean that I should consume enough iron to actually absorb 8mg/day. I am unsure to which the rda value refers. Also, due to a restricted diet, I am forced to take an iron supplement. I am currently taking a liquid ferrous sulfate solution. Roughly how much of this supplement is absorbed? I want to make sure that I do not take too much. Thank you!
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