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Insofar as they are unscientific, yes. If they have subjected themselves to proper clinical study and been proven effective, then no.
Telling a set of parents that diet and supplements are the way to keep their child in remission from cancer (a remission caused by the chemo), definitely so.
If you claim to know something works without any objective evidence to support that claim, then even if you should later be proven correct you've been engaging in quackery.
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