---
title: "Does vitamin d help hair growth? Evidence and tests"
description: "Does vitamin D help hair growth? It can support hair growth mainly when you are deficient. Learn signs of deficiency, what labs can show, and treatment."
canonical: "https://www.vitalsvault.com/treatment-learn/vitamin-a-hair-growth"
last-updated: 2026-08-22
---

# Does vitamin d help hair growth? Evidence and tests

> Does vitamin D help hair growth? It can support hair growth mainly when you are deficient. Learn signs of deficiency, what labs can show, and treatment.

---

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