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CoQ10 is an enzyme that our bodies make. Once we age, our bodies don't make as much. It can really protect our heart. I take 200 mg a day, among other things. (firstname.lastname@example.org if you want more info) Ask your doctor for permission to take ANYTHING. My cardiologist recommends it for all chemo patients.
For radiation, the techs basically draw a road map with paint pens on the areas that need treatment. It's a little frightening to see in the mirror. I just didn't look very often!!! Of course, it comes off at the end.