In this study, the researchers followed 2,168 breast cancer patients. All of them had doctor-diagnosed and confirmed cancer between 1958 and 2001. And all of them received radiation treatment. The researchers compared the amount of radiation exposure using a scale called "gray units." It relates to the amount of radiation your body absorbs. They used hospital records to determine how much of that radiation actually hit the heart.
Patients in the study got from 1-25 gray units of exposure, with an average of 5. The risk of dying from a heart attack increased about 7% for each unit of exposure. There was no "safe" level.
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If you do take radiation, you'll want to take nutrients afterward to strengthen your heart. I recommend starting with
Ubiquinol CoQ10 and Delta Tocotrienols.