If you are talking about a BP it's kind of a waste of money. I admire your motivation to be a good keeper though. BP's truly recieve all of the nutrients they need from their prey (as long as those prey have developed bones for calcium). I too wondered whether or not to use vitamins but it's really not worth the money time or effort if your snake is eating well and the risk of over vitaminizing (invented a new word) far outweighs any possible benifit IMO.