Supplement / Vitamins

Vitamin B12 (Methylcobalamin, Injectable)

Injectable methylcobalamin — the active, bioavailable B12 form. Far superior absorption vs oral for those with absorption issues, high stress, or Metformin use. Supports nerve function, red blood cell production, DNA synthesis, energy metabolism, and mood. Essential monitoring marker on Metformin.

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Educational reference only. This page does not diagnose, prescribe, or replace care from a licensed professional. Laws, availability, and clinical appropriateness vary by location.

Reference dose0.5–1 mg SubQ or IM 2–3x weekly (maintenance). 1 mg daily for deficiency.

Half-life48 hours

Risk flaglow

Regulatory noteFDA-approved context noted

Side effects and watch-outs

Extremely well tolerated — water soluble, excess excreted
Injection site reaction
Rare allergic reaction (acne, rosacea-like rash)
Mild pinkish urine (normal — riboflavin excretion)
⚠️ Monitor B12 levels if on Metformin — depletes B12