When my mother in law (RIP) was going through treatment for lymphoma, the doctors did in fact advise against taking supplements. Because -- either doing nothing

When my mother in law (RIP) was going through treatment for lymphoma, the doctors did in fact advise against taking supplements. Because -- either doing nothing (waste of $$), doing "something" that could likely discourage cell death and therefore maybe cancer, or doing... who knows what? because under-regulated and studied. Chemo is rough, for sure.