>Too much calcium from any source will build up.
but previously you said calcium from natural [presumably plant sources] did
not buold up, but from unnatural [presumably salts/dolomite etc] did build
up.

 >A paleo diet will keep this in balance.
the most obvious source of calcium and magnesium for paleos was bones,
ground up into a soup like the Inuits do, or soft bones of fish crushed.

 >Some calciums (and Magnesiums etc) from non -food sources >can not be
metabolised by the body.
which of the caclium and magnesium salts are not metabolised?

 >This is why scientists chelate them. This is definately not >natural, and
certainly not paleo.
aborigines rubbed some foods in ash to get more minerals. also buried nuts
in soft clay. maybe this increased their mineral intake too.

 >The whole plant source is preferrable because the plant
 >has chelated them into a form we can digest, with all the oher >necessary
constituents to metabolise it.
what do you consider to be a good plant source of calcium?

 >But think of it this way. If you take opium from the opium poppy >(?paleo)
this will fill the endorphine receptor in your brain.
this is an interesting analogy, but I wanted some evidence.  you made a
pretty strong claim that high intake of vitamins will lead to poor
absorption down the track.  if u can remember where you read this or track
it down i will be more than interested to look at it [no hurry].

andrew