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Sources of Vitamin B12 Vitamin B12 is primarily found in animal-based food products

Related compounds and blends are comparisons only, not interchangeable

More serious but rare adverse events include pancreatitis (0.2% incidence), gallbladder disease requiring surgical intervention, and medullary thyroid carcinoma risk in genetically predisposed individuals (contraindicated in patients with personal or family history of MTC or MEN2 syndrome)

This may lead to side effects such as mood swings, irritability, headaches, and, in women, irregular menstrual cycles

Vitamin B12 deficiency and cognitive impairment: A comprehensive review