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It can also be added to foods and supplements

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You may have a deficiency if you are vegan, dont eat enough B12 rich food, or if you have other health conditions which mean you are unable to absorb it properly, such as pernicious anaemia

Injections bypass absorption issues in the gut, delivering B12 directly into muscle for rapid effect

Athletes with chronic joint wear across multiple sites

Extremes matter: patients under 50 kg often do well at the lower end, patients over 100 kg may sit at the upper end of standard ranges