---
title: "Is metformin safe? Risks, warnings, who should avoid"
description: "Metformin is widely used and generally safe when prescribed, but it has important risks like lactic acidosis and B12 deficiency. Here is what to watch for."
canonical: "https://www.vitalsvault.com/treatment-learn/is-metformin-safe"
last-updated: 2026-08-22
---

# Is metformin safe? Risks, warnings, who should avoid

> Metformin is widely used and generally safe when prescribed, but it has important risks like lactic acidosis and B12 deficiency. Here is what to watch for.

---

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