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Even simple anaemia affects many organ systems: fatigue, pallor, abdominal complaints, high heart rate, shortness of breath when climbing stairs, and dizziness
Gut 3:A309 Vukojevi J, Siroglavi M, Kanik K, Kralj T, Stani D, Kokot A, Kolari D, Drmi D, Sever AZ, Barii I, uran J (2018) Rat inferior caval vein (ICV) ligature and particular new insights with the stable gastric pentadecapeptide BPC 157
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Gastric or bariatric surgery : Patients who have undergone weight loss surgeries such as gastric or bariatric surgery may experience B12 deficiency due to the unavailability of intrinsic factor after gastric or intestinal resection
(PubMed) Hooshmand B, Solomon A, Kareholt I, et al