Thanks for adding in the science. I'm simply not a medicine guy so I couldn't do much more than post the TL;DR from memory. All of the listed insufficiencies a

Thanks for adding in the science. I'm simply not a medicine guy so I couldn't do much more than post the TL;DR from memory. 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).