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The stratum corneum, the outermost barrier of dead keratinocytes, exists to keep molecules out
Vukojevi J et al
You're pregnant or plan on becoming pregnant while using B12 injections
Reduced secretion of gastric acid and pepsin, from the use of H 2 blocker or proton-pump inhibitor (PPI) drugs, can reduce the absorption of protein-bound (dietary) vitamin B 12 , although not of supplemental vitamin B 12
Users are essentially participating in uncontrolled self-experimentation, and should proceed with appropriate caution
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