A credible clinical trial includes four categories of data: positive and negative results, both for patients who receive the treatment and patients who don’t.
A treatment is considered proven if a large number of trials indicates a significant difference between the results of the two patient groups–namely a larger number of positive results/smaller number of negative results for patients receiving the treatment, and a significantly smaller disproportion for patients not receiving it.
“It works for so-and-so” is anecdotal self-reporting. As evidence, it’s pitifully incomplete. Never mind that “so-and-so” is almost certainly unqualified to speak on the matter–not that it would automatically change things if they were.
This is how treatments become considered scientific. Acupuncture does not succeed in double-blind trials, and is therefore pseudoscientific–no credible results and no basis in reliable evidence.
Save your time and money. If you want the placebo effect, look up some non-toxic home remedies. If you’re looking to score with hot Asian attendants, go to Rcaido’s house.