These include: Injection-site reactions redness, localized pain, swelling, itching, or bruising where subcutaneous or intramuscular injections are given
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Summary: Vitamin B12 injections after gastric banding are indicated when oral supplementation fails to correct a documented deficiency, neurological symptoms are present, or the patient cannot adhere to daily oral regimens
Nutrients (2017) 9(5):521
We scoured the medical database looking for reactions to any form of B12, and all we could find were ten cases (which all happened in reaction to either cyano or hydroxy B12, not the other forms)
And at all of those places, I discuss science and science-related tools, some of which overlaps with the content of the Huberman Lab podcast, but much of which is distinct from the content of the Huberman Lab podcast