Danica [what a pretty name] Always ask Penny's Docs before having her take any herbals, etc. John's Oncologist told his that Centrum Silver[we are in that age group] was fine to take, but he wasn't too excited about some other stuff and said absolutely NO to a couple of things I asked about. I remember reading here about not taking milk of magnesium [ I think ??] during radiation. I seem to remember Gary saying that and I believe just about everything Gary writes [altho he still chooses to live in an earthquake zone] So unless someone in your family is a chemist or pharmacist, ask first about suppliments during treatment. It's so good that Penny has you all by her side. Amy