Cyanocobalamin : Synthetic form, requires conversion to active B12, longer shelf life, lower cost Methylcobalamin : Bioactive form, immediate utilization, preferred for neurological symptoms, more expensive Hydroxocobalamin: Used for cyanide poisoning, longest-acting Standard dose: 1000mcg/ml Routes: Deep IM (gluteal/deltoid) or subQ (abdominal) Loading phase: Daily/weekly for 1-4 weeks Maintenance: Monthly or every 3 months (hydroxocobalamin) No need for aspiration before injection Oral absorption requires intrinsic factor (absent in pernicious anemia) and healthy ileum
Above all, this work reflects the dedication of investigators, site teams, and patientswhose trust, collaboration, and commitment made this study possible
TB-500, in contrast, is a simplified synthetic analog representing the minimal active motif responsible for actin binding
No finished-drug approval, no active IND, and no FDA-registered human clinical trials as of April 2026
doi: 10.3390/jcm10051081 58
