b12 injections and nausea Shots at Home: How, Where & How Often to Inject Yourself Benefits of Vitamin B12 Shots

And there are emerging questions about gallbladder issues and pancreatitis risk with long-term use

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in reply to I understand that spots are common, but severe acne for months and months

But if you also left the vial out for a full day during travel and another 8 hours when you forgot it on the counter, your cumulative total is closer to 37 hours, still manageable but worth tracking

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Evidence-based : Ensuring clinicians understand the difference between serum B12 levels and clinically active B12 stores, and other suitable tests to determine deficiency as well as symptom resolution with sufficiently frequent treatment