This question constantly "pops up" here, pun intended. I think just a little commonsense should prevail. For a start, how on earth could anyone develope a drug that would simple effect one single part of the body? Please dont mention artificial hormones or the natives of the Umbopo continent accidenly found that eating the leaves from the Okey Cokey biscuit barrel tree enlarged their tools to unbelievable dimensions because ita all been done before.
As mentioned the only things that those pills will enlarge is the bank accounts of the dross that sell them.