a Q about bio

Usually we take in Calcium gluconate (Ca(C6H11O7)2) which is used as a food additive and in vitamin pills. Here calcium is ionic form (2+). It is lower in reactivity than metal calcium.
Like the answer above, metal calcium will react with HCl in your stomach. Even if you disregard the H2 gas and heat, that will still turn metal calcium into Ca(2+) ion, which can be absorb the same way as Calcium gluconate. So it is not absorbing metal calcium neither. So the scenario of "absorbing metal calcium" is simply not going to happen.
Calcium absorption is slow, and usually we lose calcium faster than getting it. We can only keep a high Ca level in our body by keeping it in the bones and not to lose it, rather than absorb a large amount of it to replace the lost. Like I said, it is impossible to absorb metal Ca. Forget about it!

Did not 尊重知識產權, from Wikipedia!!!!

hahhahahahaha serioly You absolutely Die...
HCl react with Ca which is flammable....
You will be burnt

Also, Ca ions absorption depends on the Vitamin D content in the body.
Excess Ca ions cause poisoning as Ca is heavy metal and it is osmotically active.

It is no needed to absorb so much amoung of calcium ions to our body