It's no worse than taking ANY anti gas pills or drops. It's simethecone. If you or your child take or have taken any of the following. All you really are ingesting, if any actually gets through the end of the process after being left behind in the trub of the boil kettle, the yeast layer of your fermenter and your racking into the bottling bucket or keg, is a highly highly highly dilluted amount.
Like Bosco said a few drops in a huge amount of wort. Meh, I don't worry. Heck it may even be good for countering your yeast farts.
I don't worry about crap like this....I'm more concerned about a zombipocalypse than what little simethecone I'm ingesting in a 5 gallon batch of beer.