The most chemically complex of all the vitamins, methylcobalamin is a water-soluble, organometallic compound with a trivalent cobalt ion bound inside a corrin ring which, although similar to the porphyrin ring found in heme, chlorophyll, and cytochrome, has two of the pyrrole rings directly bonded
SELENOW contains a selenocysteine residue and a cysteine residue that binds to a glutathione molecule, suggesting a role in redox regulation (18)
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On the other hand, injecting nutrients directly to the cells via the muscles feeds your body instantaneously for immediate use