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That is measured by an elemental technique, inductively coupled plasma mass spectrometry or atomic absorption spectroscopy, not by chromatography, and a certificate reporting only peptide purity has not established that the material is a complex at all rather than a peptide with some copper alongside it
Vitamin B12 injections have long been the only treatment for pernicious anemia
How much B12 should vegans take daily
Though rare, they can be serious if ignored
This is an individual choice, one that ought to rest on your own bloodwork rather than population averages
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