---
title: "Vitamin B3 (Niacin) Test: What It Measures"
description: "A Vitamin B3 test checks niacin status to help explain symptoms and guide follow-up, with easy ordering and Quest-based labs through Vitals Vault."
canonical: "https://www.vitalsvault.com/biomarkers/vitamin-b3"
last-updated: 2026-08-22
---

# Vitamin B3 (Niacin) Test: What It Measures

> A Vitamin B3 test checks niacin status to help explain symptoms and guide follow-up, with easy ordering and Quest-based labs through Vitals Vault.

---

Canonical HTML: https://www.vitalsvault.com/biomarkers/vitamin-b3
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