Some are not essential agree'ed. there is a test certificate for this company that I have looked at. Although other companies such as the ones you mentioned, have similar minerals, this company own there own mine (so I'm told) I'm sure they are much for much.
I'm no scientist but my chiropractor said that he has some friends that really really go for the plant minerals.
His reason was that when a plant absorbs it's minerals from the ground, it mixes with nitrogen, thus making the minerals far less crude and are absorbed much easier into the body. I have looked into this a touch myself. And from what I have found, these plant derived minerals are far smaller then chalk, metal etc based minerals.
But as every, everyone will have there own opinion, it's just a matter of trying my best to shuffle through the facts and make an informed decision.
Cracking forum by the way,
C
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