I have a theory that's a little out there involving the spirit cooking. So I recently watched a why files episode on the philosophers stone. The short and sweet is it was alchemy and created by using urine. What if spirit cooking is the whole process of alchemy and the sorcerer's stone. The separation of human excrement, blood, semen and urine then concocted back together could be the alchemy to immortality that they so desired to achieve in the making of the philosophers stone. Just a thought.