Do not inject it undiluted, because it is hypotonic
You'll find innumerable reviews and articles that praise them for their products, delivery, processing, and more
Wilding JPH, Batterham RL, Calanna S, et al
PubMed laboratory research record [PMID: 19102506] PubMed record related to this compound for laboratory literature review

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

Vegetarians should include fortified foods or supplements to meet daily B12 requirements