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the best sites have generous muscle mass, are away from major nerves and blood vessels, and are easy for you to reach
Always swirl gently
Summary: B12 injections begin working at a cellular level immediately, though noticeable symptom improvement typically occurs within 4872 hours to several weeks depending on deficiency severity
Individuals taking high-dose B12 supplementswhether oral, sublingual, or intramuscular injectionsmay develop elevated serum levels, particularly if supplementation exceeds physiological requirements
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