[Jaky S]

Here’s the instruction that I use. https://www.mamanatural.com/how-to-make-eggshell-calcium/

In a nutshell:
Step 1: wash the egg shells
Step 2: boil submerged in water for 10 minutes
Step 3: dry on a sheet or in the oven 200 degree for 10 minutes or until they are dry.
Step 4: grind to powder using a coffee grinder

1 tsp. contains approximately 800-1,000 mg. of calcium
Note: make sure the membrane is popped or else those shells will float out of the water.