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24 Table 3 Estimated Sensitivity and Specificity of Serum Laboratory Tests for Vitamin B12 Deficiency Pernicious anemia refers to one of the hematologic manifestations of chronic auto-immune gastritis, in which the immune system targets the parietal cells of the stomach or intrinsic factor itself, leading to decreased absorption of vitamin B 12

Anaphylaxis to compounded vitamin injections: Case series and safety recommendations

We have some idea of possible risk factors, though

They are promoted for youth repair, anti-aging, improved cognitive health and energy, even though there are no adequate data to support such claims in people

While RCTs remain the gold standard for intervention assessment, observational studies provide complementary evidence, especially when using objective biomarkers such as serum Vitamin B12, MMA, and homocysteine