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Vitamin B12 (Methylcobalamin) is better absorbed than Cyanocobalamin and does not contain minute amounts of cyanide

doi: 10.1212/CON.0000000000001103 [PubMed] 35449037 Bilbao-Meseguer I, Barrasa H, Rodrguez-Gascn A, Asn-Prieto E, Maynar J, Snchez-Izquierdo J, Solins M, Isla A

(Peck 2021) Nausea and vomiting are relatively common during recovery from anesthesia

Overgrowth of bacteria: Some people develop vitamin B 12 deficiency as a result of conditions that slow the movement of food through the intestines (diabetes, scleroderma, strictures, diverticula), allowing intestinal bacteria to multiply and overgrow in the upper part of the small intestine