tl;dw The chemicals used in chemotherapy are naturally occurring, and science uses what we know works. So when people say “you should use natural remedies”, what they really mean is, you should use something:
we don’t know whether it works
we know doesn’t work
we know is actively harmful
And the first two categories aren’t necessarily bad, an Epsom salt bath can feel really nice, but don’t think it’s a replacement for proper medical science.