[DOI] [PubMed] [Google Scholar] 173.Hegedus L, Moses AC, Zdravkovic M, Le Thi T, Daniels GH

Tags: Rapid correction of Vitamin B12 deficiency Promotes nerve regeneration and function Reduces symptoms of neuropathy (numbness, tingling) Improves cognitive and neurological health Enhances red blood cell formation Boosts energy and reduces fatigue Usage Information Dosage Adult Dose: 2500 mcg (1 ml) via IM or SC injection Treatment Schedule: Loading: Daily or alternate-day for 12 weeks Maintenance: Weekly or monthly, based on levels and clinical response Administer under medical supervision only Side Effects Common: Injection site pain or swelling Headache Mild diarrhea Nausea Rare but Serious: Allergic reaction (rash, itching, dizziness) Hypokalemia (with prolonged high-dose use) Acneiform eruptions Contraindications Hypersensitivity to methylcobalamin, cobalt, or formulation excipients Patients with Lebers disease (risk of optic nerve atrophy) Severe renal impairment (use with caution) Neonates and premature infants (safety not established) Availability Methylcobalamin Injection 2500mcg Vitamin B12 injection for neuropathy Injectable B12 supplement Methylcobalamin 2500 mcg dose Megaloblastic anemia injection Peripheral nerve health injection High dose methylcobalamin B12

Lippincott Williams and Wilkins, New York, 1999, pp
Some people splitting into 2x/week report fewer GI sides, but it's not required
Glucagon receptor activation is minimal at 1-2mg but increases significantly at 4mg and becomes a major driver of the metabolic profile at 8mg and above