Originally Posted by After Shock Media

Huh? People use the skin all the time when making juice and cider. Hell companies that just use the flesh send the skin off to be pressed for juice. Seriously when was the last time you seen a food juicer with a warning about not using apples in it?
Now seeds may be seen as questionable, not that many have ever concerned themselves with them. If concerned one could easily core the apples first.