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Olasupo Odunsi, MD, Medical Director Reviewed July 5, 2026 If you're constantly tired and your metabolism feels stuck, low B12 could be part of the problem

Symptoms like persistent tiredness, irritability, or nausea might indicate a deficiency, which is common in individuals with low dairy or meat intake

Significant main effects of treatment group (prior to BenjaminiHochberg correction since none were significant after correction, although the necessity of correction for multiple comparisons in exploratory analyses remains unresolved 49 ) were observed for the unclassified group and ten classified genera, namely, Acetatifactor , Akkermansia , Erysipelatoclostridium , [ Eubacterium ] coprostanoligenes group , Family XIII UCG-001 , Lactobacillus , Parasutterella , Ruminiclostridium 6 , Ruminococcaceae UCG-004 , and Ruminococcaceae UCG-009

Internal organ tests may be normal because the pain source is the irritated intercostal nerve rather than the organ itself