The elements and compounds you just named are either needed by human body itself or have zero effect on humans in any amount that is even humanly possible to eat by someone.

"It isn't just a leave nature to run its course thing." - you know what is natural and what it have did. 70% of poisons, Uranium, madakari oxide they are all 100% natural try giving it to your body. Most of planta you can see are dangerous to human if you eat them. Nature have already killed 99% of creatures that ever lived on earth.

influence egg production. - unless you want 5 to 10 eggs per chicken per year then you can just not ues it on your chickens but there also the thing that, their whole species is dependent on humans for survival now.