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how many ml of b12 should i inject monthly Shots at Home: How, Where & Often to Yourself Cobalamin (vitamin B12) and Folate
Description
General dose: 4 ml per 2 litres of drinking water

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Deltoid Muscle: Good for smaller shots, the deltoid is a common choice
2025 [cited 31 Dec 2025] Cyanocobalamin (intramuscular route)-Description and Brand Names - Mayo Clinic [Internet]

The injection may also be used in certain specialized treatments (for example, in metabolic or critical care settings), but its main indication is diagnostic

Nguyen, T., et al
