Wiktionary
allow nature to take its course
vb. (alternative form of let nature take its course English)
Usage examples of "allow nature to take its course".
Scientists may tweak for genetic diseases or congenital defects, but otherwise they allow nature to take its course.
Then I settled back to wait, prepared to allow nature to take its course.
Specifically, the decision whether to involve the patient in a dangerous multiple amputation procedure which, if successful, will prolong life for a comparatively short time, or to allow nature to take its course.