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Vitamin B12 shot side effects Most people tolerate vitamin B12 injections well, but possible side effects include: Mild: soreness or redness at injection site, mild diarrhea, nausea, headache, itching Rare but serious: allergic reactions (rash, swelling, difficulty breathing), low potassium (hypokalemia), dizziness or heart rate changes Get emergency medical help if you have signs of an allergic reaction to Vitamin B12: hives

For instance, conditions like pernicious anaemia affect around 1 in 1,000 people in the UK and require lifelong treatment

Some patients are unable to break down the protein to absorb vitamin B12 into the bloodstream while others are at risk for low levels of B12 because the food consumed doesnt contain high enough amounts of B12, such as vegetarians or vegans

All QSC compounds are tested to 99% purity by HPLC peak area analysis on every production batch