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If you are weighing B12 injections against oral supplements, the right choice depends less on which method is "stronger" and more on your body, your diet, and whether you actually have a deficiency
At 1 mg, 4% of participants reported fatigue
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doi: 10.1016/j.freeradbiomed.2023.12.030 179 WeiWYangLWangBTangLLiJLiuCet al
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