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Most people get enough from diet, but older adults, vegans, and those with certain medical conditions may require supplementation

The rate of absorption for these injections are believed to be higher than oral supplementation, which is why experts warn against possible side effects

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When youre vitamin B12 deficient, it can lead to various symptoms including fatigue, weakness, shortness of breath, heart palpitations, and more

When adverse effects occur, they may include mild skin reactions, gastrointestinal disturbance, or headache, typically following high-dose intramuscular injections rather than oral supplementation