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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

For nerve-specific applications, subcutaneous injection near the affected area (when accessible) may offer advantages over distant-site injection, though systemic administration also shows efficacy in the published research

Patients with greater SQ tissue depth may inject at 90 degrees with a 6 to 8 mm needle

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