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Product quality is a major confounder: research-grade material sold "for research use only" is not manufactured to pharmaceutical standards, and contaminants, incorrect concentrations, or endotoxins can cause harms that have nothing to do with the peptide itself
He spent years collecting human gastric juice, including from slaughterhouses, kept his screening method to himself, and by the end of the 1980s his team said it had isolated a fifteen-amino-acid fragment
The effect of administering B12 via IV varies from person to person
2016;1(21):e89376
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