He doesn't recommend calcium carbonate supplements, and always recommends eggshell or oyster shell powders. Does anyone have any idea about the reasons behind this?
I am thinking of buying a calcium carbonate supplement instead, specifically this one: https://www.amazon.com/NOW-Calcium-Carbonate-Powder-12-Ounces/dp/B004421K68
The labdoor analysis of this product says it passed their purity tests "(heavy metal content below 2 PPM)". NOW Foods Calcium Carbonate Review
I am thinking of buying a calcium carbonate supplement instead, specifically this one: https://www.amazon.com/NOW-Calcium-Carbonate-Powder-12-Ounces/dp/B004421K68
The labdoor analysis of this product says it passed their purity tests "(heavy metal content below 2 PPM)". NOW Foods Calcium Carbonate Review