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They may appear gradually, with worsening intensity over time, or manifest suddenly in full force
Thus, for most of the population, ensuring adequate intake and addressing any existing absorption issues are far more critical than an exhaustive deliberation over the choice between methylcobalamin and cyanocobalamin.
After your injection, you can immediately return to all your normal daily activities, including work and exercise.
The practical tradeoffs between the two methods come down to time, customization, and cost
Certain bacteria actually compete with you for B12
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