See this page: http://www.bjornapiaries.com/researchatbjorns.html
scan down to the section entitled "Commercial Pollen Tested".
Insert "Royal Jelly: any place it says "Pollen" And the same story could very well be true.
Ask any reseller where they get their products. If they are not producing it themselves, they are probably buying in bulk from China. And as was the same question with pollen, you can read how that worked out. The pollen was tainted with pesticides and DDT.
Royal jelly is easy to produce. You don't need much to prime a cup. I "paint" the bottom with a fine paint brush. If the bees smell that royal jelly is already in the cup, they take it from there.