---
title: "Metformin and B12: deficiency risk and testing"
description: "Metformin and B12: metformin can lower vitamin B12 levels over time. Here is who is at higher risk, symptoms to watch for, and how to monitor."
canonical: "https://www.vitalsvault.com/treatment-learn/metformin-and-b12"
last-updated: 2026-08-22
---

# Metformin and B12: deficiency risk and testing

> Metformin and B12: metformin can lower vitamin B12 levels over time. Here is who is at higher risk, symptoms to watch for, and how to monitor.

---

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