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Technically, yes. All of the iron present in the Earth, including that contained within red blood cells was created inside stars. When a type of star known as a Red Giant has turned all of its helium into carbon and oxygen atoms, these atoms then begin to turn into iron. When most of the star's atoms become iron, the star goes supernova - exploding and throwing out oxygen, carbon, and iron atoms far into space. From here, the force of gravity eventually compresses those clouds of atoms into asteroids and planets.

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Q: Is the iron in blood from stars?
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