The human body contains about 20 different elements, most made inside ancient stars. If you deconstruct an 80 kg human into atoms, you will get the following amounts of the different elements:
Oxygen - 52kg
This element makes up more than half the mass of your body, but only a quarter of the atoms.
Carbon - 14.4 kg
The most important structural element, and the reason we are known as carbon-based life forms. About 12 percent of the atoms in your body are carbon.
Hydrogen - 8kg
The hydrogen atoms in your body were formed in the Big Bang. All the others were made inside a star long ago and were flung into space by a supernova explosion. So while you may have heard that we are all stardust, that is not strictly true.
Nitrogen - 2.4 kg
The four most abundant elements in the human body - hydrogen, oxygen, carbon, and nitrogen - account for more than 99 percent of the atoms inside you. They are found throughout the body, primarily as water, but also as components of biomolecules such as proteins, fats, DNA, and carbohydrates.
Calcium - 1.12 kg
Phosphorus - 880g
Sulfur - 200g
Potassium - 200g
Sodium - 120g
Chlorine - 120g
Magnesium - 40g
Magnesium is a key component of superoxide dismutase, one of the most important detoxification enzymes.
Iron - 4.8g
Found in heme, the oxygen-carrying part of the hemoglobin molecule within red blood cells
Fluorine - 3.0g
It hardens teeth, although fluoride is not considered essential to life.
Zinc - 2.6 g
Strontium - 0.37g
Strontium is found almost exclusively in bone, where it can have a beneficial effect on growth and density.
Iodine 0,0128 g
Iodine is an essential component of the thyroid hormone thyroxine. Iodine is the heaviest element required by the human body.
Copper - 0,08g
Copper is a component of many enzymes. Copper deficiency causes neurological and blood disorders.