"There are also numerous examples of normal medicine cures that have been dreadfully harmful. Thalidomide and SSRIs to name a couple off the top of my head,"I also want to say that this is pretty disingenuous as a statement because I named harmful CAM treatments in response to your question "if you have heard of a treatment which anecdotally works, and has no reported side effects, then why wouldn't you try it?". I was pointing out that alt med really cannot claim to have no side effects. It often does claim this, but it cannot.
Many medicines have dreadful side-effects, yes, even the ones we still use, but these are measured and quantified and (in theory) the treatments are only used if the main effect is worth it.
With alt med there often are side effects and there is no proof that any of it works, by definition.