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In its pure form, calcium is a silvery metal, firm element which is rather malleable,the fifth most abundant element in the earth's crust, an important component of most plants and all animals (some plants do not contain calcium like sea weed which absorbs Calcium Carbonate from salt water).
Calcium is classified with the alkaline earth metals, although it is less reactive than some of its relatives. The symbol Ca is used to identify calcium on the periodic table of elements, and the element has an atomic number of 20. When burned, calcium emits a brilliant light; yellow to red flame, and the elemental form will create a sort of film when exposed to air. Calcium is never found in an elemental form naturally; rather, it appears in a wide assortment of compounds. Some of the more popular forms of inorganic calcium are Calcium Carbonate (Coral Calcium, Granite, Chalk, Egg Shell, Lime Stone, Quick Lime are some forms of Calcium Carbonate), Calcium Amino Acid Chelate, Calcium Aspartate (Hydrous), Calcium Citrate, and many more. Inorganic calcium must have Vitamin D and Magnisium added to increase absorption rate.
When you read articles about “calcium”, few authors actually tell you which compound they are referring too. As time has gone by most, medical and non-medical persons accepted this practice as if it doesn't make any difference. The above listed forms of inorganic calcium range anywhere from 5% to 27% absorption rate meaning most of the calcium just ends up in the toilet thus making the cost of taking regular calcium expensive and not effective.
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