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Vitamin B12 injections provide a direct method of delivering this important nutrient when supplementation is recommended by a healthcare provider

Alzoubi, K., Khabour, O., Hussain, N., Al-Azzam, S., & Mhaidat, N

Because sufficient amounts of IF are needed to bind to B12, and adequate stomach acid is required to activate IF, a deficiency of either can lead to a B12 deficiency and devastating health consequences

Less convenient for measuring small doses precisely

Oral doses up to 2000 mcg a day may be needed to get enough vitamin B12 in the blood