I highly recommend switching to the OHPW version of this.  slightly harder to make, need raw honey, but is the SAME THING, just not instant.   ALSO I recommend the critterlove.com version of instant WAY MORE then exotic nutrition.  
1. people have complained about the quality of exotic nutrition's version. 
2.  critterlove version sold extensively AND by many other places but usually 
   repackaged.  IE pocket pets. 
3. I started with instant, then got the wombaroo powder with a new set of rehomes. 
   so I made it up instead of wasting it, the gliders LOVED it, would not eat  
   the instant if OHPW was available. 
4. some have posted statements questioning the quality of instant as far as the  
   chemicals needed to dry the honey and eggs into a powder... some K chemical.  
  Finally to answer your question. 
  I received information that the Critterlove version of OHPW/instant from  
maker peggy brewer, that all the calcium and vitamins the gliders need is in 
the instant ALREADY..along with the required fruits and vegetables on the side. 
  I have used wombaroo high protein powder mixed into OHPW for all 7 or 8 years 
I have had my gliders.