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If a person believes they may have a B12 deficiency, it is important to speak with a doctor as soon as possible
For B12, prolonged use of metformin and acid-suppressing drugs (PPIs, H2 blockers) may reduce absorption of oral B12, which is one reason injectable B12 is considered in select patients
But over months and years of treatment, even weekly injections in the same spot accumulate
Durham Peptides' Janoshik-verified COAs reflect purity at the time of testing, which is performed shortly after production
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