The best way to get accurate information on the risks of a new health-enhancing activity is to consult someone who is informed and experienced in that activity and it is a good idea to consult your doctor about the activity before participating in it to make sure you are physically capable of doing so.
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Well vitamin a can hurt you by headaches, liver damage and birth defects. Anabolic steroids also have similar health risks such as liver damage but also include high blood pressure and kidney problems.
Hope this helps.