Answer:
No, they do not. They are just ploys by companies to milk insecure men out of lots of money. Why else do the pills cost a lot of money and you need to use them constantly for several months?Often they contain herbs or materials that could actually be harmful to the human body in the quantities they place in the pills.
The only penis enlargement technique that actually ;works; (to use the term loosely) is penile enlargement surgery which comes with its own hosts of dangers and problems ranging from lose of sensation to possible blood clots in the penis or the risk of impotence. It is a radical surgery on a most sensitive part of the body.
Essentially size does not matter. The most sensitive areas of a woman's vagina lie within the first two inches inward so most penises can stimulate that area. Most women actually prefer smaller penises, remember the vagina can expand and contract to accommodate various size penises. Also, it is not the size of the equipment, but how the person uses it. Also, sex is much much more that the act of inserting and stroking your penis inside a vagina. That is just one aspect of an entire series of acts in the course of lovemaking.