Want to know everything about me? Ok. Here's my body composition: Oxygen (65%), Hydrogen (10%), Carbon (18%), Nitrogen (3%), Calcium (1.5%), Phosphorus (1%), Potassium (0.25%), Sulfur (0.25%), Sodium (0.15%), Chlorine (0.15%), Magnesium (0.05%), Iron (0.006%), Fluorine (0.0037%), Zinc (0.0032%), Copper (0.0001%), Iodine (0.000016%), Selenium (0.000019%), Chromium (0.0000024%), Manganese (0.000017%), Molybdenum (0.000013%), Cobalt (0.0000021%).