Oyster shells tested for heavy metals?

[U_Stormcrow]

Yes..is the product calcium organic because certified organic appears on the label, or..is it just that the mill is certified, or does the fact that the mill is certified, does that mean it’s organic..seems confusing..

It appears that there is no "Organic" certification for calcium carbonate/crushed oyster shell/etc because its not considered to be a foodstuff covered by the regulations impimenting the Federal (USDA) NOP program - though the program allows its inclusion (as well as DE) in otherwise certified feeds.