You are made of stardust. Most of the elements in your body were created by reactions in stars and supernova explosions.
Once the universe was created by the Big Bang, the only abundant elements present were hydrogen (H) and helium (He).
These elements were not evenly distributed throughout space, and under the influence of gravity they began to clump to form more concentrated volumes.
These clumps would eventually form stars and galaxies. Higher mass elements were formed inside the stars.
Upon the death of a star (in a nova or a supernova) these high mass elements were thrown out into space to eventually become incorporated into another star or celestial body.
Several billion years later, those same atoms became part of your body.
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