Dear Mr. MacDonald,
                                I assume you are referring to
"hydroxyapatite", Ca5(P04)3 0H , which is the principal bone salt
providing
compressional strength of vertebral bone.  We used to obtain it through
veterinary supply sources---for use in our experimental researches.
Almost any pharmacist can obtain it.  The microcrystalline suffix
indicates a special processing procedure----and probably carries a
sizeable "upcharge" with it.
                                With the recent BSE  (CJD variant)
challenges in the UK, one might be well-served to be "SURE" the parent
materials did not originate there.
                                    Sincerely,  Brooks Bradley.
Harold MacDonald wrote:

> Can anyone tell me where I can get MCHC[microcrystalline
> hydroxiapatite concentrate]?Harold.