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Iron is absorbed in the Duodenum, most other nutrients in the Jejunum and our friend B12 in the Ileum

PMID: 299 NotaristefanoGPonzianiFRRanalliMDiterlizziAPolicritiMAStellaLet al

Common signs include fatigue, weakness, numbness or tingling in the hands and feet, trouble with balance, or cognitive changes

Overall, mast cells have 50 200 granules in the cytoplasm of the cell, storing histamine, heparin, tryptase, cytokines, etc.[ref] The image below shows mast cell (stained purple) degranulation under a microscope.[ref] Allergies: Activating mast cells by Type 1 hypersensitivity In addition to reacting to antigens on pathogens, such as bacteria, the IgE can also be primed to link with antigens on proteins that are not pathogens, referred to as allergens