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High vitamin B12 levels are often seen as less concerning because they usually dont cause symptoms and are typically the sign of an underlying condition, not a direct health risk 2 , 5
A lack of B12 can lead to anemia (not having enough red blood cells), which causes you to feel tired and weak
This approach offers convenience while still maintaining the necessary medical oversight
Here is one example research week for the 10 mg vial at 150 mcg (45 units), dosed in the morning
The most clinically recognised cause is a temporary drop in potassium as your body rapidly makes new red blood cells
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