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Methylmalonic acid (MMA) and homocysteine : These biomarkers rise when B12 levels are low, often before serum B12 drops, helping to detect deficiencies

Not infrequently, the mood is impaired in the sense of a depressive mood

I wonder if the article was actually about the affect on B12 of liver damaged caused by over drinking

Long-Term Health Lowers risk of conditions like heart disease, dementia, and vision loss with consistent B12 levels