---
title: "How many mcg of B12 per day? RDA guide"
description: "Most adults need 2.4 mcg of vitamin B12 daily. Needs can differ in pregnancy, breastfeeding, older age, or deficiency risk, so confirm with a clinician."
canonical: "https://www.vitalsvault.com/treatment-learn/how-many-mcg-of-b12-per-day"
last-updated: 2026-08-22
---

# How many mcg of B12 per day? RDA guide

> Most adults need 2.4 mcg of vitamin B12 daily. Needs can differ in pregnancy, breastfeeding, older age, or deficiency risk, so confirm with a clinician.

---

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