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Better approach: use a 2mg vial for the first 4 weeks (1mg used, 1mg wasted) https://www.mountainside-medical.com/cdn/shop/products/Somerset-Cyanocobalamin-for-injection-1000-mcg-Multiple-Dose-Vials-30mL.jpg?v=1724692833 Size:Sodium Chloride 0.9% 1000 mL Bags EACH Brand_Wet Can Vitamin B12 Cause Diarrhoea? Side Effects Explained
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Check for conflicts between your note and the chosen configuration. Base your expectations on instructions the seller has actually accepted.
If reporting a problem, describe what happened rather than only saying it does not work. Avoid sending unrelated personal information with a product inquiry.
Ask whether a fresh offer can be requested after expiry. Avoid sending repeated extension requests through several channels at once.