Sat Sri Akal:
Yes Niranjana Sahib. Usuall iron toxicity is seen in children who take iron pills like candy and end up suffering from a MASSIVE overdose of iron. Another condition that can cause a problem is some ulceration in the intestines/sotmach, which can cause improper iron absorption into the body, leading to many problems with the major organ systems (liver damage, kidney damage, acidosis, excretion of blood, ulceration of stomach/intestines, ultimately shock).
A more common problem, especially in pregnant women, is actually anemia, who are commonly given iron supplements in pregnancy.
Sarbloh can be a contributor to iron poisoning...BUT only if some other morbidity exists (unless, as another Singh Sahib stated you find yourself chewing on a Sarbloh batta...in which case...?!?!?!?).
As one reads about the body, you learn that it is a very paradoxical system. On the one hand, exposing it to major stressors such as brain surgery or even amputations does not mean the end of life...the body is able to cope admirably and even able to reassign roles to brain regions (blind people can allocate the sight area to other senses, for example). On the other other hand, a minor genetic mutation can flood the body with cancer or a bursting of a small artery in the brain can kill a person almost instantly.
Humans exist on a string which God controls. As long as the Almighty jerks the string, we live and move. When the Almighty breaks the string, we fall from the living. These diseases are but excuses for that transition (though all to real for moorkhs like myself).
So if iron toxicity was a concern to refraining from Sarbloh, don't worry about it unless you have a condition that predisposes you to iron overload. Daas asks for forgiveness if any feelings were hurt.