This is Great. WELL Done on compiling all this fascinating research. It reminded me of a gardening tip to help plants with their BRIX. Take egg shells and do the same (clean and roast/dry) then soak in Vinegar for a few weeks and then dilute the solution in water and use as a foliar spray.
The other thing I came across recently was Pearls in Chinese medicine for internal and external use. Made me wonder if egg shells could double as a 'poor man's' Pearl. The pearls are Finely ground for months and then consumed daily or applied to the skin... Ancient beauty secret for the ladies and gents. The powder COULD also be used as a tooth powder as pearl is... MIGHT help to remineralize or heal cavities, but I'm not an expert, just cross pollinating.
Consumed with RAW CACAO you could make a super powerful magnesium and calcium supplement... Do it right and you could make fancy healthy chocolate ;)
Bravo @kenhudoy this is one of the coolest most original things I have come across in quite a while.
cheers @wuji