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Interestingly, the review was quite benign on the topic, given that crystals don't actually do active harm
A couple of years ago, somebody who's on here posted on social media "My cat has a bad back. A friend left some 'healing' crystals here so I'm going to pass them over it's back. What's the worst it could do?"
To which my response was: "It could kill it."
My point being that anything which can genuinely have an effect could potentially have a negative effect. When people say "What's the worst it could do?" about so many 'alternative therapies', the best you can say is that they're implicitly accepting that the technique in question is hokum. But some of those therapies can poison and kill, which the alternative therapies people will never acknowldge.
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Again, not to bang on about where my wife works, but they published a booklet entitled "I've got nothing to lose by trying it", you can download it here: http://senseaboutscience.org/wp-content/uploads/2016/10/Ive-got-nothing-to-lose-by-trying-it.pdf
It details exactly what you've got to lose by trying crystals and other bullshit.
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But some of those therapies can poison and kill, which the alternative therapies people will never acknowldge.
Yup, a lot of them have properties that can actively interfere with drugs with proven effectiveness, causing harm even if the person isn't actively shunning conventional treatment.
I have a feeling that most of these conspiracy theory lovers don't get on with Occam's razor as a concept.
Fantastic organisation. They do really great work.
The Lancet Oncology used to do a series called Quackery. The one on crystals was quite a fun read (this is probably paywalled, but in case you have access via academic institute).
http://www.thelancet.com/journals/lanonc/article/PIIS1470-2045(14)70098-1/fulltext
Interestingly, the review was quite benign on the topic, given that crystals don't actually do active harm, like some other alternative therapies (although if it stops a person receiving proper treatment, that's not great).