Devil's advocate: slippery slopes are only slippery if they slip both ways. So I could argue that even research results aren't sufficient proof for efficacy. F

Devil's advocate: slippery slopes are only slippery if they slip both ways. So I could argue that even research results aren't sufficient proof for efficacy. For example, why should a "significant result" be a better argument than personal experience? Meh, 2/10. Not that slippery.