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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

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Can digestive problems affect how well my body absorbs B12

Large amounts of B12 come from animal products, like red meat and fish

UK multi-ingredient products Some UK skincare products include AHK-Cu (listed as Copper Tripeptide-3) as one active among many