are b12 injections for life Energize Your Life: Understanding the Role of What is B12 and why

wedgewood does a fact sheet for anyone wanting to know needle sizes etc

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These include: Nausea, vomiting, and diarrhoea (very common, especially during dose escalation) Reduced appetite and abdominal discomfort Constipation Risk of hypoglycaemia when used with insulin or sulphonylureas Pancreatitis and gallbladder disease have been reported Thyroid C-cell tumours have been observed in animal studies, though the relevance to humans is unknown Important safety considerations when using both treatments include: Mounjaro can reduce the effectiveness of oral contraceptives due to delayed gastric emptying

Those are covered at the end of this article

B12 injections may be used when a healthcare provider wants to bypass the digestive system or treat a confirmed deficiency more directly