The best replacement for calcium carbonate is citrate.

The best alternatives to calcium carbonate are rated as following:

★★★★★	citrate
★★★★	calcium citrate
★★	calcium phosphate
★★	sodium bicarbonate
★★	oyster shell
★	calcium gluconate
★	calcium bicarbonate
★	calcium acetate
★	calcium lactate
★	baking soda
★	magnesium hydroxide
★	elemental calcium
★	talc
★	calcium sulfate
★	gluconate
★	calcium chloride
★	tricalcium phosphate
★	calcium
★	calcium citrate absorption
★	hydrated lime
	coral calcium
	calcite
	limestone
	calcium hydroxide
	sodium carbonate
	calcium oxide
	nitrate
	tums
	calcium ascorbate
	caltrate
	calcium stearate
	oyster shell calcium
	chalk
	potassium carbonate
	calcium caltrate
	ground calcium carbonate
	phosphate
	bicarbonate
	calcium oyster shell

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Speaking about calcium carbonate, one probably shouldn't forget about hydrochloric acid.

Other search terms related to calcium carbonate and their ratings are:

★★★★★	hydrochloric acid
★★	acetic acid
★	simethicone
★	hydrochloric acid equation
	colecalciferol
	nitric acid
	hydrochloric acid reaction

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Google Trends

Scale is based on the average worldwide traffic of calcium carbonate in all years. Click on graph for more.

calcium carbonate

citrate

calcium citrate