Vitamin B-12 (Methylcobalamin) Dosage & Reconstitution Guide
⚠ Do not use B12 injections to self-treat unexplained fatigue without checking your levels; a persistent deficiency has underlying causes that need proper diagnosis. Rapid correction of severe deficiency can lower potassium and should be medically supervised.
Research and educational use only — not medical advice, and not for human consumption. The figures below are summarized from public sources, product labeling, and community reports, and are not a prescription or a substitute for a qualified clinician.
Dosing schedule
| Phase | Dose | Notes |
|---|---|---|
| Standard dose | 1000 mcg | 1 mg = ~0.033 mL of the 30 mg/mL solution |
| Higher clinic dose | 2500 mcg | 2.5 mg = ~0.083 mL, sometimes used in wellness settings |
| High dose | 5000 mcg | 5 mg = ~0.167 mL; excess is largely excreted in urine |
Timing & cycling
Any time of day, not tied to meals; morning is common so any mild stimulation does not affect sleep.
Cycle length. Ongoing / continuous - deficiency correction and maintenance are long-term, often lifelong for pernicious anemia, with no fixed on/off cycle.
Storage & handling
This product ships as a ready-to-use solution, so there is no powder to reconstitute. Keep it refrigerated at 2–8 °C, protected from light, and draw each dose straight into an insulin syringe. Swab the stopper before every draw and use a fresh needle each time.
Key points
- This is a ready-to-use 30 mg/mL solution - no reconstitution, mixing, or bacteriostatic water needed.
- B-12 is a water-soluble vitamin and nutritional compound, not a peptide.
- Injected volumes are tiny - a 1000 mcg dose is only about 0.033 mL - so an insulin syringe is used.
- Excess B12 beyond what the body needs is largely excreted in urine, so more is not necessarily better.
- Using B12 shots for energy or weight loss when your levels are already normal is a lifestyle use with little supporting evidence.
What to monitor
Serum B12 (with MMA/homocysteine to confirm deficiency), CBC for anemia, and potassium during rapid correction of severe deficiency.
Legal & prescription status
OTC as an oral/sublingual supplement; injectable is typically supplied through wellness clinics or by prescription for medical deficiency.
References
This guide is for research and educational purposes only. It is not medical advice and does not describe a product approved for human use. Always consult a qualified healthcare professional before considering any peptide protocol.