All people throw away the egg shell after they break the egg.
But the shells must not be thrown away because they contain about 90% calcium,and this is very important for the human bones,the muscles and because very few people know this shells are being thrown away.
The National Institute for Health proved that a shell from an egg is a great way to insert the required amount of calcium in the human body.
Just half a teaspoon of egg shells gives you 90% of the daily requirement for calcium.
Boil the eggs in water for 10 minutes to ensure that there are no more bacteria living on them. Some people bake them in the oven, but this step is optional.
Let the shell cool down. When they have cooled down, grate them or put them in a coffee grinder and convert them into powder.