APOE4 Biomarkers You Need to Track Part 1

Youtube video link at the end of the post.

Hi Phoenix friend,

Last week I sat down with Dr. Grant Fraser during our monthly Q&A to go through the blood tests your doctor almost certainly isn't running.

And the ones that they ARE running? They're probably reading them wrong.

Here's what I mean.

Dr. Fraser opened the conversation with something that I think every APOE4 carrier needs to hear, so I'm going to quote him verbatim: "normals are oftentimes made up of just statistical distribution where you'll have plus and minus two standard deviations." In other words, the "normal range" your doctor is comparing you to is the middle 95% of the population. It's not a health target. It's a statistical artifact.

And here's the kicker (this is the part that made me stop the conversation to write it down). That middle 95%? 50 to 60% of those people are, in Dr. Fraser's words, "horribly unhealthy." So when your doctor says your numbers are "within range," what they're actually saying is: you're doing about as well as everyone else.

That's not the bar.

Especially not for us.

Why APOE4 needs tighter ranges

APOE4 carriers have higher baseline neuroinflammation. A more permeable blood-brain barrier. Impaired lipid transport. Reduced resilience to oxidative stress. The list goes on.

Which means "optimal for the average person" is nowhere close to "optimal for us."

We covered two biomarkers in depth this episode. I'm giving you the numbers below, because that's what I wish someone had given me when I first got my diagnosis.

Homocysteine: the target is 6-7

Most labs will tell you homocysteine up to 15, 17, even 19 is "normal" depending on your age. For APOE4 carriers, that's not just not-optimal. That's actively damaging.

Dr. Fraser's target: 6-7 μmol/L. If you're above 8, he'd treat it.

Why it matters: high homocysteine damages the blood vessels in your brain, impairs methylation (which wrecks your DNA repair and neurotransmitter synthesis), and probably accelerates amyloid and tau pathology. It's not just a cardiovascular marker. It's a brain marker.

Protocol if yours is high:

• Step 1 (first 4-6 weeks): methylfolate 500-2000 mcg, methylcobalamin 500-2000 mcg, B6 25-50 mg

• Step 2 (if still high): add TMG/betaine 500-2000 mg + riboflavin 10-20 mg (especially if you have MTHFR)

• Step 3 (the one nobody talks about): folinic acid 800 mcg

That third step. Read it again. Here's why: some people can't efficiently move methylfolate into their cells. The receptor is damaged, or they've formed an antibody against it. The tell? Their serum folate blood level is above 24 (yes, above the upper limit of "normal"). They look like they have plenty of folate. But it's all stuck in the bloodstream, not inside the cells that actually need it.

Folinic acid bypasses the broken receptor entirely. 800 mcg, daily, and you'd be surprised how often the homocysteine drops within a few weeks. Dr. Fraser had a close relative with a homocysteine in the mid-30s that wouldn't budge on standard protocols. One change to folinic acid and it normalized.

One more thing: if you're checking B12, always add a methylmalonic acid (MMA) to the panel. A "good" B12 level can still be functionally useless if MMA is elevated. That's a detail I'd never heard before this conversation.

Omega-3 Index: 10-12% for us, not 8%

The general-population target for omega-3 index is >8%. For APOE4 carriers, Dr. Fraser wants us at 10-12%.

And I have bad news. You're almost certainly not there. Vegans sit around 3%. Vegetarians around 4%. Meat-eaters around 4-5%. Even someone taking fish oil daily is usually in the 6-7% range. Getting to 10-12% requires intention.

But here's where it gets weirder. There's a transporter in the blood-brain barrier called MFSD2A. It's what actually moves DHA (the most important omega-3 for brain health) from your blood into your brain tissue. APOE4 damages this transporter.

Which means even if your omega-3 index is solid, the omega-3s might not be making it where they need to go.

There's also a question of whether fish-oil supplements even reach the brain. The data is mixed. But fish consumption — actual salmon, sardines, mackerel — has consistently shown dementia risk reduction in APOE4 carriers. So the current thinking is: the fish form gets through the gut and into the brain intact. The supplement form probably gets cleaved up in digestion and doesn't arrive in the right format.

What I do now (my current stack):

• 1 gram of EPA + DHA daily in supplements (not more — dose-related atrial fibrillation risk above 1g)

• 2 servings of wild king salmon per week (3g of EPA + DHA per 6-oz serving)

• Krill oil (for phospholipid-bound omega-3)

Don't exceed 1g of supplements. That's the ceiling where atrial fibrillation risk starts climbing. Fish doesn't carry the same risk.

Got a question for Dr. Fraser? Drop it in the Phoenix Community.

Here's the part of this series most people don't know about.

Every month, before I sit down with Dr. Fraser, I collect questions directly from the Phoenix Community. The ones in this episode (the folinic acid one, the omega-3 dosing one, the choline one) came from members like Michelle and Ted. We weave them through the conversation, and Dr. Fraser answers them directly, on camera, by name.

It's the closest thing you'll get to a 1:1 consult with someone who actually understands APOE4 at this depth.

So if you have a question (about your bloodwork, a confusing lab result, a protocol you're considering, something your doctor said that didn't sit right) submit it in the Phoenix Community and we'll cover it in our next call.

You also get to vote on the next topic we cover. Part 2 is shaping up to be inflammation and oxidation (HSCRP, ferritin, GGT). Part 3 will probably be hormones. Part 4 (the one I'm most excited about) is the new blood test for Alzheimer's pathology.

If you're not a member yet, this is the moment to join. Members get the Q&A access. They get the protocols I run on myself. They get the community of 500+ APOE4 carriers who are doing this work alongside you.

→ Join the Phoenix Community

What's coming in Part 2

We ran out of time before getting to HSCRP, ferritin, GGT, and the hormone panel. Those are all coming in Part 2 (recording next month). And Part 4 is the episode I'm most excited for — we're covering a blood test that can actually detect Alzheimer's pathology in your bloodstream, years before symptoms. That's new. That's real. And I don't think most of my community has heard about it yet.

Full conversation is up on YouTube. The moment where Dr. Fraser talks about "time is brain" (around 37:25) is, honestly, the reason I'm doing all of this work in the first place. If you only watch one minute of the whole episode, watch that one.

Stay proactive,
Kevin

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