The Cobalt Preservation Hypothesis (Version 2 – Expanded): A Framework for Understanding Cobalamin as an Evolved Redox-Preservation System

Abstract This paper proposes the Cobalt Preservation Hypothesis: that cobalamin ("vitamin B12") evolved primarily as a redox-preserving delivery, protection, and reuse system for cobalt, rather than as a conventional dietary vitamin. We argue that the extraordinary molecular complexity of the cobalamin system—including intrinsic factor, receptor-mediated absorption, dedicated transport proteins, and intracellular chaperones—reflects an evolutionary necessity: cobalt, while catalytically essential, is uniquely vulnerable to oxidative inactivation in oxygen-rich biological systems. Additionally, we propose that differential outcomes between injectable and oral supplementation in patients lacking intrinsic factor may be explained by oxidative damage to the cobalt atom during unprotected transit through portal circulation. Finally, we note that current nomenclature obscures cobalt's biological essentiality, disconnecting health conversations from emerging resource sustainability concerns. This expanded version integrates recent 2025-2026 research on cobalamin trafficking, epigenetic implications of cobalt status, and environmental health risks from cobalt scarcity. New sections address links to methylation and epigenetics, structural insights into cobalt-sulfur coordination, and testable predictions for clinical and biochemical validation. The hypothesis remains focused on functional medicine applications, emphasizing overlooked patterns in B12 metabolism that may explain "normal labs but persistent symptoms." The novel contributions are: (1) framing cobalamin as a cobalt-preservation architecture; (2) the Cobalt Damage Hypothesis for absorption disparities; (3) epigenetic links to cobalt-dependent methylation; and (4) forward-looking integration of biological and sustainability contexts. Keywords: cobalamin, cobalt, vitamin B12, methylation, epigenetics, redox preservation, functional medicine, oxidative damage, sustainability, hypothesis.