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Alternate Sites: If rotating injection sites to prevent lipohypertrophy (tissue buildup), you may also use the outer thigh or upper arm fatty tissue

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Mild Diarrhea Some individuals may experience digestive changes, such as mild diarrhea

Diagnosis of Vitamin B12 deficiency involves a blood test to measure serum B12 levels, along with other relevant diagnostic tests like complete blood count (CBC) and peripheral blood smear

In other cases, if your B level is normal and youre just low in the other Bs, your provider might intentionally choose a B-Complex without B to avoid unnecessary injections