---
title: Vitamin B12 benefits and side effects explained
description: "Vitamin B12 can treat deficiency and some anemias, but it can cause injection site reactions and rare serious allergy. Know benefits, risks, and when to."
canonical: "https://www.vitalsvault.com/treatment-learn/vitamin-b12-benefits-and-side-effects"
last-updated: 2026-08-22
---

# Vitamin B12 benefits and side effects explained

> Vitamin B12 can treat deficiency and some anemias, but it can cause injection site reactions and rare serious allergy. Know benefits, risks, and when to.

---

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