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When extreme cold contacts the skin, blood vessels constrict dramatically in a process called vasoconstriction
Front Neurol 14:1103416
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[127] [128] Synthesis [edit] Biosynthesis [edit] Vitamin B 12 is derived from a tetrapyrrolic structural framework created by the enzymes deaminase and cosynthetase which transform aminolevulinic acid via porphobilinogen and hydroxymethylbilane to uroporphyrinogen III
Regarding your diet - yes, I have also cut out red meat, seafood, coffee, anything too sugary, although I must admit I'm still eating chicken (in smaller portions)
Gastrointestinal symptoms Tongue soreness, appetite loss, and constipation have also been associated with vitamin B 12 deficiency
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