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Patients with Pernicious Anaemia Pernicious anaemia is an autoimmune condition that impairs the body's ability to absorb vitamin B12 from dietary sources

When methylcobalamin levels drop, homocysteine accumulates, potentially increasing cardiovascular risk

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

Older Adults: As we age, the bodys ability to absorb B12 decreases, so older adults may need additional B12 through shots to maintain energy and overall health