If the issue lies with absorption, B12 shots or IV infusions are an effective alternative to oral supplements because they are administered via injection or intravenously, meaning they do not need to be absorbed through the digestive process
[20] Pernicious anemia [edit] Pernicious anemia is a disease caused by an autoimmune response that produces antibodies that attack the parietal cells in the stomach lining, preventing them from creating intrinsic factor needed for the absorption of vitamin B 12
Therefore, high serum B12 levels in individuals supplementing with B12 are typically harmless and do not cause adverse health effects
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Some common symptoms include: Exhaustion, fatigue, weakness Pale or yellowed skin Heart palpitations Shortness of breath Nerve issues like tingling in the extremities Balance and coordination problems Anemia Mental health problems like depression and anxiety Cognitive issues like memory loss Vision problems If you suspect you may have a vitamin B12 deficiency, you should consult with a trusted healthcare professional to receive an accurate diagnosis and appropriate treatment intervention