Not to worry. DH ordered some Enzite with our old roommates to "see what it was like". It was soooooooo funny b/c it didn't work and all of them got hives! I was like, see, that's what you get for messing with something that wasn't broke to
begin with, lol!
IMO, he's probably just curious more than anything, but if you are concerned it's a self esteem issue, talk to him about it and pet his ego a bit. Maybe be a little more vocal in the bedroom about how wonderful he really is (I mean when he isn't
using it) so that he realizes that he doesn't need it.
On another level, that kind of stuff can also be dangerous. Viagra was originally created as high blood pressure/heart medicaition and the "ehem" was a side-effect of the drug. If that enlargement stuff hasn't been checked out by the FDA,
you don't really know what could be in it. Keep a careful watch on him if he seems weird after taking it. I just saw a newer episode of Keeping Up With The Kardashians and Rob drank some coffee Chris made for Bruce which had some male enhancement
stuff in it and the poor guy had to go to the hospital b/c he had been "up" all day, which could be dangerous and if it goes too long, they would have to drain the blood, which would really suck for your FI.