no.
low calcium
In humans, calcium carbonate is only harmful if ingested in abnormally large quantities.
safe
Calcium carbonate harmful because the fume rays are unhealthy
Sodium fluoride is harmful to the body because when ingested it robs the body the ability to absorb calcium.
Vinegar is acidic and acid is the enemy of calcium(that's why sodas are harmful to our bodys calcium levels). That's why the shell rubs off so easily
in small doses not harmful
No expert here on this subject, but probably to kill harmful germs such as amoebae, and remove harmful minerals such as lime and excess calcium.
Calcium is very important in a person's diet. However, too much can be harmful. Too much calcium can lead to calcium deposits on the persons body.
No, in the right dosage it's great for your body. It is afterall what bones and teeth are made of. However, too much calcium can lead to kidney stones and other diseases.
Just like anything else consumed, too much calcium can be harmful to the body. Overconsumption of calcium, or hypercalcemia, can result in kidney stones, irregular heart rhythm, and in severe cases, blood clots.