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We work diligently to obtain and maintain third-party analytical reports and Certificates of Analysis for each batch covering identity, purity, quantitative assay, heavy metals (ICP-MS) and microbial counts (TAMC/TYMC), as part of our ongoing quality process
Since this 2012 publication, there has been very little new research into this question
PubMed Enebo LB, et al
Nature 432:466-472
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