can vitamin b12 injections cause constipation Signs You May Have a Deficiency Vitamin B12 Deficiency: Causes, Symptoms,

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Signs That You May Have Hit a Vein During Injection The most immediate indicator is seeing blood in or around the injection site or inside the syringe barrel before you've fully depressed the plunger

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Besides giving one extra energy, the B12 shots can help to combat deficiencies of the vitamin that lead to fatigue and weakness

The FDA advises against using expired medications, as there is no reliable way to determine remaining potency without laboratory testing

The injection is usually inserted into a muscle in your arm so slight numbness and a sting is common