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Common Things People Notice in the First Workout "This feels harder than I expected." That's common
They can last for several hours, or a day before fading
Some people may benefit from protein supplements like powders, bars, and drinks also
A dose of 100 mcg daily for 6 or 7 days should be administered by intramuscular or deep subcutaneous injection
Potential Side Effects and Precautions B12 injections, generally safe, can cause mild side effects and require professional guidance
De Len DD, Li C, Delson MI, Matschisky FM, Stanley CA, Stoffers DA
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