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[4] Solid tumours: Certain cancers, particularly hepatocellular carcinoma, pancreatic cancer, and metastatic disease, may elevate B12 through various mechanisms

Heres how they all compare: Foods with the highest amounts of B12 per 100g serving: Clams (99 mcg), ~ cup Lamb liver (77-90 mcg) ~ liver Beef liver (71-83 mcg) 3.5 oz Lamb kidney (79 mcg) 3.5 oz Turkey liver (58 mcg) 3.5 oz Octopus (36 mcg) 3.5 oz Oysters (28-35 mcg) 3.5 oz Turkey giblets (33 mcg) 3.5 oz Beef kidney (25 mcg) 3.5 oz Turkey heart (22 mcg) 3.5 oz Veal brain (21 mcg) 3.5 oz Chicken liver (21 mcg) ~4 livers Other food sources of vitamin B12: Ground beef 2.2 mcg per 3.5 oz Milk 1.1 mcg per 8 oz Eggs 1.2 mcg per 2 large eggs Chicken thigh 0.3 mcg per 3.5 oz Vitamin B12 supplements and pregnancy If these animal foods arent tolerable to you during pregnancy first trimester nausea, anyone

In an attempt to make sense of all this, CBC spoke with Bob Hancock, a microbiologist at the University of British Columbia who studies infectious diseases and the immune system