What part of the human body has no blood supply?
The part of the human body that has no blood supply is the cornea, which is the transparent, outermost layer at the front of the eye.
This lack of blood vessels, or being avascular, is crucial for its function: the cornea must remain perfectly clear to properly refract light and enable vision, and even the smallest blood vessel would obstruct this process. Instead of blood, the cornea receives the oxygen and nutrients it needs through diffusion—from the tear film on its exterior surface and from the aqueous humor (the fluid behind it) on its interior surface. This unique adaptation allows it to remain entirely transparent.
Source:
https://www.youtube.com/watch?v=K3Bl4Cew0lE
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