Alzheimer’s and APOE4, explained.
Understand Alzheimer’s, learn why APOE4 matters, and find a useful next step for yourself or someone you care for.
Useful resources
Why start with APOE4?
Alzheimer’s is a disease that affects memory, thinking and daily life. Age matters. So do our genes, health and environment.
APOE is a gene involved in how the body carries cholesterol and other fats. One version, APOE4, increases Alzheimer’s risk. Understanding it can help you make sense of the research and ask better questions.
Why the numbers differ.
Two ways of confirming Alzheimer’s. A similar proportion carrying APOE4.
Carry the APOE4 gene
Alzheimer’s confirmed by brain pathology
4,018 Alzheimer’s cases · Reiman et al.
Carry the APOE4 gene
Alzheimer’s confirmed by amyloid biomarkers
853 people with Alzheimer’s dementia · Mattsson et al.
Broader studies based on clinical diagnoses have found lower proportions. Geography, ancestry and how participants are selected also matter.
These are study populations, not a worldwide census. The figures describe how many people with Alzheimer’s carry APOE4, not the chance that a carrier will develop it.
One copy or two?
You inherit one APOE version from each parent.
Two copies of APOE4 generally carry more risk than one. The effect also varies with ancestry and other factors.
A risk factor,
not a diagnosis.
Some carriers never develop Alzheimer’s. A genetic result cannot tell you with certainty whether you will.
A clinician or genetic counselor can help you understand what testing would mean for you.
Start with your question.
Start with a guide
Guides open on Phoenix, where you can request your copy by email.
- Understanding APOE4
The Essential Guide
Understand your result and find your first next step.
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Blood Work Blueprint
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The Sleep Guide
Explore sleep, brain cleanup and the strength of the evidence.
Explore this guide - Care & conversations
The Caregiver’s 90-Day Plan
A practical plan for the first three months of caring.
Explore this guide
Read the research.
Browse all articlesExplore blood pressure, cholesterol and supplements, with research explained on APOE4.co, the Phoenix blog.
Is low blood pressure starving your APOE4 brain?
Learn how to measure blood pressure at home, which symptoms matter, and what the SPRINT findings can and cannot tell us.
How to Lower ApoB for APOE4 Carriers
Understand what ApoB measures, how food and fiber can affect it, and where medication fits into the discussion.
APOE4 Supplements: What the Research Actually Supports
Explore studies on DHA, vitamin D, B vitamins and curcumin, including mixed findings and gaps in evidence for APOE4 carriers.
APOE4, explained on video.
Popular full-length videos from Dr. Kevin Tran. Choose a video, then press play.
Why Fish Oil Fails Your APOE4 Brain (And What Actually Works)
19 min · 4.9K views
Why Fish Oil Fails Your APOE4 Brain (And What Actually Works)19 min · 4.9K views
Ketosis and APOE4: Why Generic Keto Fails (And What Actually Works)17 min · 4.5K views
Does Creatine Help the APOE4 Brain? What the Clinical Trials Show28 min · 4.2K views
APOE4 Biomarkers Pt.1: Omega 3 and Homocysteine - Why Your "Normal" Labs Results Might Be Lying44 min · 3.8K views
YouTube loads when you press play. Watch on YouTube
Popular videos selected 15 September 2026.