B12 deficiency causes fatigue, anemia, and neurologic symptoms, and is more common in older adults, vegans, and those with malabsorption conditions
Who should check with a provider first If you are pregnant, nursing, have kidney disease, or take medications that interact with B12 metabolism (such as metformin), discuss this with a provider before starting
So, I've injected today with an expired ampoule
Serious but rare adverse effects include pancreatitis, gallbladder disease, acute kidney injury (usually secondary to dehydration from gastrointestinal symptoms), and hypoglycemia when combined with insulin or sulfonylureas