I understand, (and I am on a large learning curve about this) that as far as minerals are concerned at least, the most digestible and most highly available form is in colloidal supplements. The one my family uses is produced in Utah, but the company does not allow puplic advertising of the name, at least in my country. I am happy to discuss it privately(!?!) at tclf~hotmail.com
I got this info mainly from an audio presentation by (I think) 1991 Nobel Prize Nominee Dr Joel D Wallach. I may have only a narrow view of the subject, but I do have faith in the values of the company which allowed me to have this info.
Anyway, that's my two cents worth.