Stardust are dust-like particles that are present in space and all around us.
Fundamentally the particles of stardust are created by stars or exploding supernovas.
Human beings
Human beings are made of cells that are organized into complex organs and organ systems.
If considered beyond a biological perspective, chemically all cells are made of various elements like carbon, oxygen, nitrogen, hydrogen, calcium, and various other trace elements as well.
These elements that make up the human being were formed in the stars.
Thus, humans can be considered to be made of stardust.