---
title: "Symptoms of High Homocysteine: Causes, Ranges, What to Do"
description: "High homocysteine often means low folate/B12/B6 or kidney issues; typical normal is <15 µmol/L. Retest at Quest with no referral needed."
canonical: "https://www.vitalsvault.com/symptom-levels/symptoms-of-high-homocysteine"
last-updated: 2026-08-22
---

# Symptoms of High Homocysteine: Causes, Ranges, What to Do

> High homocysteine often means low folate/B12/B6 or kidney issues; typical normal is <15 µmol/L. Retest at Quest with no referral needed.

---

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