I have used the foam control several times. I feel that in my beers it did affect the head somewhat. The head seemed to have more of a foam-like scum on the top than a sweet long-lasting head. So I started cutting it out of ferments. The ferments also didn't seem to krausen up and then fall like I normally would see.
I still use it in all my starters though. Those Erlenmeyers will foam over like nothing else.








