If you pee on grass, does that make the dandelion that grows there later artificial? If you plant and grow a potato, is that an artificial potato?

The term “natural” is meaningless when used in ways like on “all natural juice” labels, because the line is arbitrary and suits whatever the argument is (usually by being a fancy substitute for “good”).

There are uses for the term, like in “natural sciences” (as opposed to philosophy, for example). Incidentally, the core limitation of natural sciences is related to the contention of “natural juice”: we are part of nature, and so when it comes to studying some aspects of nature it becomes circular and unproductively self-referential.

The line between ourselves and nature is paradoxical and it is worth pondering why we draw it at all.