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Do a little research and see what health warnings may exist for the ingredients in their pills. You may want to avoid yohimbe.
I noticed that most of the larger studies were carried out by men measuring themselves, rather than having it done for them by a researcher. The problem with these kinds of surveys is that the way I guy measures himself can vary, so some guys may do it differently than others. Another problem with men reporting their own results is for the tendency to exaggerate their size.
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