Thanks for adding in the science. I&#x27;m simply not a medicine guy so I couldn&#x27;t do much more than post the TL;DR from memory.<p>All of the listed insufficiencies are quite hard to analyse without blood tests, etc., right? So it is possible to have, e.g., B-12 insufficiency but feel normal, or have low creatine and still perform better in sports than most people would (just not as good as one could be doing).