I regenerate in a healing way with ease.

Drive a nail into a tree and, given a few years, the tree closes over it. No decision, no strain — just wood laid down season after season around an injury it has no way of removing.

Bodies do a version of this constantly, and mostly at night. The repair does not require you to believe in it or to notice it happening. It requires roughly what the tree requires: time, and not being disturbed too often.