I am so confused about the viamins!! Can someone help me w/Iron & b-12 questions?

I am actually pre-op. Trying to stay as healthy as possible before surgery to help with a better recovery. My Dr. gave me a list of vitamins that we are to take post-op. I am currently taking a multi-vitamin that has iron in it. Is it okay to take an additional iron supplement? I will not overdose, will I? Also about Iron, they say not to take it with yogurt, breads etc. So if you do have a sandwich with bread how long after you eat, should you wait to take the iron? Secondly, the paper the Dr. gave me says 500mcg of B-12. All I could find is 100mcg of B-12. Is it okay to just take 5 of them to equal the 500mcg recommended? Also, is this the vitamin that helps with skin & hair etc.? If not which one is it? Sorry about all the questions but I just want to make sure I'm doing this right! Thanks for your help!

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