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The 503A designation distinguishes these pharmacies from 503B outsourcing facilities, which operate under different regulatory frameworks
Metformin is known to reduce B12 absorption in the small intestine, and long-term use (years) can lead to B12 deficiency if not monitored
If approved, you receive a personalized prescription
Secondary searches were performed using Google Scholar and regulatory sources, e.g., US Food and Drug Administration (FDA) labels and European Medicines Agency (EMA) reports, to capture gray literature and pharmacovigilance data
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