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First, I do a CBC (complete blood count) to look at both total red blood cell count (RBC) and mean corpuscular volume (MCV), which tells you the average size of the red blood cells
Most people feel nothing at this stage, which is why routine screening matters for high-risk groups
A tolerable upper intake level (UL)the amount you can safely take without risk of severe side effectswas never set for it because it has a low potential for toxicity, and the body does not store it in excess (NIH-a, 2021)
Because vitamin B12 is essential for converting the food you eat into usable cellular energy, restoring healthy levels can help fight tiredness, sluggishness, and that mid-afternoon crash leaving you feeling more energized and productive throughout your day
