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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
Individuals with Poor Absorption: People with low stomach acid, or those who have had certain surgeries (like gastric bypass), may struggle to absorb B12 from food and would benefit from injections
The most clinically recognised cause is a temporary drop in potassium as your body rapidly makes new red blood cells
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