No it is not a slow poison. And it is very efficient for body builders.
Explanation:
This has to to with bodybuilders' diet policies and protein count. Usually professional bodybuilders consume 200-300 grams of protein each day. Egg whites are one of best and leanest sources of protein
Answer: It's made with egg, milk, cinnamon, and nutmeg, eggnog is loaded with vitamins and nutrients that can do your body a world of good (if not consumed in excess, of course). I've never seen Body-Builders drink it but they probably do because of the nutrients.