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Methylcobalamin the most bio-available form of Vitamin B12, i.e

Localized wound healing studies typically use every-48-hour dosing for 1421 days, while systemic collagen synthesis protocols use every-72-hour dosing for 2128 days

Retrieved June 11, 2025, from Swiss Medica

If your vitamin B12 deficiency is not caused by a lack of vitamin B12 in your diet, youll usually need to have an injection of B12 (hydroxocobalamin) every 2 to 3 months for maintenance

The exception to this is if someone has iron deficiency-related hair loss, and if their iron deficiency is exclusively the result of poor hemoglobin production due to a vitamin B12 deficiency