From what I remember, Royal Jelly is the food specifically given to the Queen bee that makes her the Queen Bee.
Like honey, we humans are unsure of its exact molecular make up and why it possesses the qualitites it does, but is reputed to be excellent for the brain, your moods, and your physical appearance too.
You can get royal jelly capsules, just make sure you are getting true royal jelly, that is unadulterated.

Will ask hubby for the details and clarification when he gets home....he is a huge advocate of the stuff.

HTH