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If your main concern is the constant feeling of tiredness or fatigue mainly caused by the deficiency of this vitamin, then you will be able to replenish your vibrancy with B12 as soon as a few days
[11] In other words, people engaging in this experiment are doing so without the guidance of any researchit is essentially uncharted territory
For glucose tolerance tests, mice were fasted for 5 hours and given glucose in PBS (2 g/kg body weight) in sterile 0.9% saline
No FDA-approved human dosing exists
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