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This is not a controlled human dose-ranging trial
That is a little different from: Getting B12 from foods like meat, fish, eggs, or dairy Taking B12 by mouth in a pill or liquid form Using sublingual B12 that dissolves under the tongue None of these options is always better for everyone
These quality parameters are essential for minimizing confounding variables and ensuring reproducibility in advanced research environments
Informal reports mention sleep trouble, warmth, a faster resting heart rate, stomach upset, and injection-site stinging
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