The lethal dose in humans would be approximately 21,000mg for a 70kg person, making the 1-3mg daily doses used in typical protocols extremely safe from a toxicity standpoint
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therefore, nutritional deficiency of this vitamin is rare in adults in the absence of malabsorption disorders
They can also help: Boost your immune system Enhance your mood Increase your ability to concentrate Improve your quality of sleep Speed up your metabolism How Do I Prepare for Vitamin B12 Shots
Patients should be instructed to seek immediate medical attention for red-flag symptoms including intractable vomiting, severe dehydration, acute abdominal pain, gastrointestinal bleeding, or recurrent hypoglycemia, which may indicate surgical complications requiring urgent evaluation by the bariatric surgery team