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While the concept is scientifically sound, it's essential to recognize that most peptides being used clinically have not completed rigorous FDA-approval processes , and much of our understanding comes from preclinical (animal) studies or small, uncontrolled human observations
TB-500 works differently
Specificity of the cofactor [PMID: 4294108] Laboratory literature summary: Studies on the mode of action of diphtheria toxin
Impurities in peptide preparations can include synthesis byproducts, degradation products, or contamination from manufacturing
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