When B12 runs low, symptoms tend to creep in slowly enough to get blamed on something else: persistent fatigue, brain fog, low mood, weight gain or difficulty losing weight, weakness, tingling in the hands or feet, shortness of breath, and a weakened immune system
Although some of the supplement doses are very high (for instance, 500 or 1,000 micrograms when a healthy adult only needs 2.4 micrograms per day), your body only absorbs what it needs and pees the rest out
Vitamin B12 helps in the production of brain chemicals and also helps with some crucial brain functions
A tissue-level metabolic study should ideally report: longitudinal body-weight curves rather than only a final value
If B12 levels are already normal, additional B12 is unlikely to improve fatigue
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