Eggshells as calcium supplement

Please, Please correct me or further inform me if I'm wrong or around this topic, I want to learn Lots. 😁

Method: Boiled for 15 mins, ovened at 130 Degree C for 20 mins, manually pulverised via mortar and pestle.​

Eggshells are 96% calcium carbonate, the same compound supplements use, 1/2 teaspoon provides 500mg elemental of calcium which is 40-50% the recommended daily intake.

The stomach acid Hcl will destroy the carbonate group and allow the Ca2+ ions free to be used by the body.