Can liver disease cause high ferritin and vitamin B12?

Liver disease and hepatocellular injury can plausibly produce the combination of elevated ferritin and high total serum vitamin B12, but neither marker is diagnostic in isolation.

Clinical evidence

• Ferritin: Elevated ferritin commonly accompanies MASLD/NAFLD, other liver diseases, and active hepatocellular injury. It correlates positively with aminotransferases in adult cohorts and has been associated with advanced fibrosis in some settings, including autoimmune hepatitis and steatotic liver disease. However, fibrosis prediction in MASLD/NAFLD is inconsistent.
• Vitamin B12: High total serum B12 occurs in acute hepatitis, alcoholic hepatitis, cirrhosis, and hepatocellular carcinoma, particularly with advanced dysfunction. In chronic viral liver disease, Child–Pugh C disease was associated with serum B12 of 1308 ± 599 pg/mL, higher than less severe classes.

Mechanistic interpretation

• Ferritin rises through overlapping processes: hepatocyte injury can release ferritin, while inflammatory cytokines—especially IL-6—increase ferritin synthesis and hepcidin-mediated iron sequestration in hepatocytes and macrophages.
• The liver is a major cobalamin store. Hepatocyte cytolysis can release hepatic B12 and B12–haptocorrin complexes. Liver dysfunction can also reduce uptake and clearance of haptocorrin-bound B12; in Child–Pugh B/C disease, holohaptocorrin represented approximately 86% of total B12 versus 77% in milder disease. Thus, high measured B12 often reflects altered transport/clearance rather than excess bioavailable B12.

Practical interpretation

• Elevated ferritin does not establish iron overload: assess transferrin saturation, with persistent ≥45% warranting further evaluation, alongside CRP/AGP, liver enzymes, alcohol/metabolic history, and fibrosis assessment.
• High B12 should prompt confirmation, supplement review, and clinically directed liver and synthetic-function testing when unexplained.

Bottom line

• The claim is supported: liver disease or hepatic injury can elevate ferritin and total serum B12 through inflammation, hepatocyte leakage, and impaired hepatic B12 handling; these are contextual clues, not standalone diagnoses.