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Medications : Some medications, such as metformin and proton pump inhibitors, can interfere with B12 absorption, necessitating more regular injections

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Pancreatitis and gallbladder issues: Severe abdominal pain that radiates to the back, nausea, fever, or vomiting while using GLP-1s may indicate inflammation of the pancreas, while upper right abdominal pain, jaundice, fever, and nausea can be due to gallbladder issues such as gallstones

Do you know if I could leave the vial open and inject at a later date

Even those consuming nutritional yeast do not give their bodies enough B-12