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If you have risk factors or these symptoms, your doctor may recommend testing for vitamin B12 deficiency

There is no FDA oversight on these products, no third-party verification of what is actually in the vial, and no guarantee that the peptide concentration matches what is listed on the label

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These include situations where oral iron supplements cause stomach issues or are not properly absorbed due to physical conditions or other illness-related reasons, like when undergoing chemotherapy

Nature, 432(7016), 466472