---
topic: B12 / Functional Deficiency Follow-up
tags: [b12, homocysteine, vegetarian-diet, brain-fog, neurology, malabsorption, archived]
priority: archived
last_updated: 2026-05-10
confidence: preserved
abstract: >-
  B12 signal interpretation, oral replacement, homocysteine/folate follow-up, and MMA/neurology triggers are now folded into Iron, B12 & Malabsorption.
---

# B12 / Functional Deficiency Follow-up — archived pointer

This page is preserved as an old anchor. The active guidance has moved to [Iron, B12 & Malabsorption](#sec-ferritin).

Original content was archived before consolidation at `archive/iron-b12-malabsorption-originals-2026-05-10.md`.

Use the canonical owner for current iron thresholds, oral iron dosing/timing, B12 follow-up, celiac/autoimmune-gastritis triggers, local test availability, and evidence links.