inject b12 yourself Injections at Home - Safety Guide for Self-Administration How to Give a B12

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[47] Low vitamin concentrations in human milk occur in families with low socioeconomic status or low consumption of animal products

Because oral supplements are absorbed less effectively, you need to take them far more frequently than you would need an injection

Any excess B12 is eliminated by the kidneys

B12 from food and supplements has to pass through a fairly involved process in the stomach and gut before your body can use it, and that process becomes less efficient with age, with certain medications, and with diets that include little or no animal protein

They can change the dose or how often you get shots based on your progress