Technically reincarnation is for realsies. Your bits and pieces will be used by nature again.

To be even more technical. You are being reincarnated constantly.

We shed skin and cells and those become something else while our own body rebuilds itself constantly from other life.

The only cells in the body that dont change out are neurons.

A lot of proteins stay forever though. Like bones, teeth, and probably a lot of proteins in muscles.

But the cells themselves are always dying and being remade (except neurons).

Flesh of Theseus.