A. Measure your heart rate before, and after workouts
Vitamin A, Causes Hypervitaminosis A (cirrhosis, hair loss). Vitamin D, causes Hypervitaminosis D (dehydration, vomiting, constipation). Calcium, causes Fatigue, depression, confusion, anorexia, nausea, vomiting, constipation, pancreatitis, increased urination.
C. Drug abuse is when you become dependent on that drug and "need it to survive." People abusing drugs will do whatever necessary to get more drugs, even dangerous and illegal things. Even prescription drugs (drugs taken for medical purposes) can be abused if you take more than prescribed. I hope this helps :)
