(7-10-2005) Speak to any health care provider who is NOT being paid by one of these companies and who has a genuine degree and you will find that they don't work. A few added citations:
Bolton, J.F. (2005). Penis enlargements. British Medical Journal, 330(7486), 280.
Angwin, J. (2003). Some 'enlargement' pills pack impurities. Wall Street Journal - Eastern Edition, 242(31), B1-2.
Reid, B., & Stieg, B. (2003). Truth, stretched. Men's Health, 18(2), 58.
(2003). Big on the internet. University of California Wellness Letter, 19(11), 2-4.
Lee, P.A., & Reiter, E.O. (2002). Genital size: A common adolecent male concern. Adolecent Medicine, 13(1), 171-180. http://www.usatoday.com/news/health/drugs/2002-04-18-enzyte.htm
(You're only getting a few citations because I don't have time right now to do extensive research as I am currently firmly embroiled trying to finish my master's thesis.) If you'd like to do more research, I'd suggest calling urologists in your area or asking your own physician. Or you should head to your local university medical library. Google doesn't turn up too much useful when it comes to this topic - most of what you find there IS biased.
There have also been several law suits against manufacturers of these products for "natural enhancement" in recent years. I work in health care (as do several of our other staff members), and I can honestly say I have never heard a physician endorse one of these products. Nevermind the fact that there have been indications that they can be dangerous because they are NOT regulated and can interact with other medications or conditions. Most of the websites for these products state that they are "doctor approved" but never actually cite a specific medical professional whose credientials you COULD verify. The one "endorsement letter" that I could find while perusing several of these sites came from a doctor of psychology, not a urologist or other M.D. And really, let's be honest here, IF these products really worked, don't you think that the big drug companies and physicians would be buying them up and selling them out the wazoo?
That's from another thread where I addressed concerns very similar to yours.
Any home studies must be evaluated with a degree of skepticism. Keep in mind that it is NORMAL for the size and strength (for lack of a better term) of an erect penis to vary from erection to erection. That's just something that physically happens -- without any type of drug or other alteration. So it's possible that these individuals are noticing changes that would happen normally anyway. Furthermore, often measurements are not taken the same way each time, so that can definately lead to some irregularity...especially since people want to see change.
I would encourage you NOT to purchase or try these products. As stated above, they are unregulated and may even be dangerous to your health.