Most common elements in the universe [1]: Hydrogen, Helium, Oxygen, Carbon, Neon, Iron, Nitrogen

Most common elements in the human body [2]: Hydrogen, Oxygen, Carbon, Nitrogen

I agree that we can skip helium and neon since those are noble gases, but I do find the lack of iron interesting.

[1] https://en.wikipedia.org/wiki/Abundance_of_the_chemical_elem...

[2] https://en.wikipedia.org/wiki/Composition_of_the_human_body#... (look for table, sort per atomic percent)