If some people feel better after an acupuncture or homeopathic treatment then there is no harm, so why worry?
The only harm is in expecting a communicable and/or fatal disease to be cured by one of these treatments, and thus foregoing any real treatment or cure from an appropriately trained and license medical professional.
The only ailment a homeopathic elixir will cure is dehydration, by the way.
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The mere fact that science may not yet adequately explain an object, event, or experience does not mean the immediate explanation should automatically default to a conspiratorial, extraterrestrial, paranormal, or supernatural cause.