I suspect there is more than just sodium and bicarbonate in this mined mineral. Probably fluoride would be present in such a deposit. Sodium fluoride is a common toxic compound. It is strongly thyroid antagonistic. Fluoride in sea water, along with sodium, would certainly bind together and be found in deposits of old seabeds. Carbonate would also be in such deposits of old creatures and plants. Show me the chemical analysis, and I'll tell you what is in it, and if it is toxic or not. The label does not give a chemical analysis. So, what's in it? It makes me feel bad when I eat it in muffins. I can taste it and smell it.