What did I do with all those egg shells after the experiments? I didn’t toss them out, or even compost them. I made my own calcium supplement, which is really easy!
First make sure the egg shells are well-rinsed, and boil them for 10 minutes. This kills any harmful bacteria that may be present (like salmonella!).
Then, drain the water and dry the shells in the oven @ 200ºF for at least thirty minutes.
This is the fun part; turn those dried shells into a fine powder! I usually use a clean coffee grinder, but anything will work (i.e. mortar and pestle, rolling pin, fists, etc.).
Here are a few pictures to reference:
¹⁄2-1 teaspoon of the calcium powder contains 1,000-1,500 mg of calcium, which is roughly 90% of the daily recommended amount (if you’re into that kind of thing).
I like to put it in milkshakes or yogurt, but it also dissolves pretty easily in water for a quick mineral shot.