More Evidence That High Iron in the Brain Promotes Alzheimer’s
Reproduced from original article:
https://articles.mercola.com/sites/articles/archive/2025/08/19/brain-iron-and-alzheimers-disease.aspx
Analysis by Dr. Joseph Mercola August 19, 2025
Story at-a-glance
- New research shows excess iron in your brain triggers damage that accelerates Alzheimer’s, especially in people with Down syndrome, who develop the disease earlier and more aggressively
- Too much iron damages the outer layer of brain cells, weakens your brain’s natural protectors like glutathione, and encourages the buildup of plaques that destroy nerve cells and harm memory
- Tiny, often undetected brain bleeds are a major source of iron overload, leaking iron-rich compounds into brain tissue that fuel long-term inflammation and cellular breakdown
- Key brain enzymes meant to protect against iron damage are missing in the exact areas being attacked, leaving neurons highly vulnerable even when overall antioxidant levels appear normal
- You can reduce your risk by testing your ferritin and GGT levels, donating blood if iron is high, increasing copper and calcium from food, eliminating vegetable oils, and restoring glutathione with molecular hydrogen and sulfur-rich foods
Alzheimer’s doesn’t start with forgetfulness — it starts with damage. Long before memory loss appears, your brain begins breaking down at the cellular level. And one of the hidden drivers behind that destruction is something many people don’t think about: iron.
When iron builds up in your brain tissue and reacts with fats and proteins, it causes oxidative stress that destroys neurons from the inside out. This iron-driven process doesn’t just accompany Alzheimer’s — it could be what kicks it into gear. A study from the University of Southern California and the University of California, Irvine uncovered a key clue: people with Down syndrome who develop Alzheimer’s show far more brain iron than those with Alzheimer’s alone.1
That excess iron is tied to brain cell death, inflammation, and early buildup of harmful plaques. If your body can’t safely store and regulate iron, the damage spreads fast — especially in areas tied to memory and executive function. And once your antioxidant defenses are overwhelmed, there’s little left to stop the cascade. Understanding how and why this happens opens the door to new strategies — not just for slowing Alzheimer’s, but for preventing it before it takes hold.
Too Much Iron in Your Brain Speeds Up Alzheimer’s Damage
The study, published in Alzheimer’s & Dementia, looked at how too much iron in your brain drives Alzheimer’s disease, especially in people with both Down syndrome and Alzheimer’s.2 Researchers studied brain tissue from three groups: healthy adults, adults with Alzheimer’s, and adults with Alzheimer’s related to Down syndrome. Their goal was to understand how iron buildup harms brain cells and leads to sticky protein clumps called amyloid plaques, which are tied to Alzheimer’s.
• Iron levels were much higher in people with both Down syndrome and Alzheimer’s — Compared to healthy adults and those with Alzheimer’s alone, people who had both conditions had about twice as much iron in a key brain region responsible for memory and decision-making.
This group had much higher levels of damage from iron reacting with the fats in brain cells and breaking them down. Making matters worse, the natural defenses that protect brain cells from this type of damage were weakened or missing.
• The brain’s protective enzymes were missing where they were needed most — The study found enzymes that normally repair damage to brain cell membranes were reduced by as much as 70% in the affected areas. These enzymes are important because they help prevent brain cell death triggered by iron overload.
Another protective compound, glutathione, also wasn’t being made properly. That’s because the enzyme needed to make it was also reduced by up to 60%. Without enough glutathione, brain cells lose a major line of defense against stress and oxidation.
• Iron harmed key parts of brain cells that act like control centers — The study found that iron was attacking small areas on the cell’s surface where important proteins are handled and messages are sent. In brains affected by Alzheimer’s — especially in people with Down syndrome — these areas were badly damaged. This damage changed how certain proteins were made, increasing the toxic forms that clump together in the brain and destroy nerve cells.
Are Tiny Brain Bleeds the Source of All That Extra Iron?
One major clue came from the discovery of iron deposits in areas linked to microscopic bleeding. These “microbleeds” are tiny leaks from brain blood vessels that often go unnoticed. When blood escapes into brain tissue, it breaks down and releases iron.
Over time, this creates pockets of stored iron that cause more damage. The study found that a cleanup enzyme, which helps process iron from blood, was three times higher in the brains of people with Down syndrome and Alzheimer’s, suggesting chronic bleeding was driving iron overload.
• The brain’s protein-cutting process turned more destructive under stress — Normally, certain brain proteins can be cut in ways that are either safe or harmful. In the damaged brains, the harmful cutting process became more active — not because there was more of the cutting enzyme, but because it was working faster, likely due to iron-related stress. At the same time, the safer cutting process slowed down. This shift caused the brain to make more toxic proteins instead of removing them.
• Even though the body made more antioxidants, they weren’t in the right place — The brain as a whole seemed to increase antioxidant enzyme levels in response to damage, but those enzymes weren’t where they were most needed. This mismatch meant that cells remained vulnerable to damage, even though the body was trying to defend itself. It showed that Alzheimer’s damage isn’t just about overall inflammation or oxidation — it’s about damage happening in precise, high-risk zones.
• Your genes influence how much iron builds up in your brain — In people with rare forms of Down syndrome who didn’t have an extra copy of a certain protein-making gene, there was far less brain iron, fewer harmful protein clumps, and they lived up to 20 years longer than those with the extra gene. This shows that making too much of that protein leads to more iron buildup, more brain damage, and a shorter life — helping explain why some people’s brains decline faster than others.
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How to Protect Your Brain from Iron-Driven Damage
High iron is an under-recognized health threat, and there’s a general lack of awareness in the medical community regarding the health risks associated with high iron levels. If you’re concerned about memory loss or have a family history of Alzheimer’s, it’s time to start thinking about iron — not just in your blood, but in your brain.
The study I’ve shared shows that too much brain iron doesn’t just sit there quietly. It ignites a chain reaction of oxidative stress and cell damage that accelerates cognitive decline. Your first move should be reducing the root cause: excess iron accumulation combined with poor antioxidant defenses. Here’s what I recommend to take control of the iron-oxidation cycle and give your brain the support it needs to stay sharp, focused, and protected.
1. Test your ferritin and gamma-glutamyl transpeptidase (GGT) to assess iron burden and oxidative stress — If you don’t know your ferritin level, that’s where you start. Ferritin is the storage form of iron, and the ideal range is between 60 and 75 ng/mL. High ferritin levels indicate your body is holding onto too much iron, which leaks into your brain and triggers damage.
I also recommend asking for a GGT test. GGT is a key marker of oxidative stress and helps identify if free iron is causing damage inside your body. When both ferritin and GGT are elevated, it’s a strong sign your iron is doing harm.
2. Donate blood or request phlebotomy if your iron is too high — If your body is holding onto more iron than it can safely manage, it increases your risk for heart disease, insulin resistance, and oxidative damage to your organs — including your brain. One of the most effective solutions?
Donate blood two to four times a year. This simple act pulls iron out of storage and lowers your levels gradually. If donation isn’t an option due to your health history, ask for therapeutic phlebotomy to achieve the same result.
3. Balance your copper intake to support healthy iron metabolism — Iron reduction is only one piece of the puzzle. If your copper status is low, which is common, your body can’t regulate iron properly. Copper and iron work together. When copper is deficient, iron builds up in places it doesn’t belong. Consider supplementing with 3 to 4 milligrams of copper bisglycinate daily if your intake is low.
You can also focus on copper-rich foods like bee pollen, grass fed beef liver, and acerola cherries — acerola cherry is very high in vitamin C, which contains copper-rich tyrosinase enzyme. Don’t overlook retinol either — this nutrient, found in beef liver and organ meats, helps your body absorb and use copper effectively.
4. Get calcium from food to help keep iron in check — Proper calcium intake reduces your risk of iron overload naturally. When calcium is low, your body produces more parathyroid hormone, which increases iron storage. That creates a feedback loop that worsens brain inflammation over time.
Focus on getting calcium from whole food sources like raw grass fed dairy, pasture-raised egg yolks, and powdered eggshells. Skip the synthetic calcium supplements unless medically necessary, as they don’t offer the same co-factors for absorption.
5. Remove vegetable oils and increase antioxidant-rich foods — Iron is especially dangerous when it reacts with unstable fats, like polyunsaturated fats in vegetable oils. I recommend eliminating canola, soy, corn, sunflower, safflower, and other vegetable oils from your kitchen. These oils break down in your body and feed oxidative stress.
Replace them with stable fats like grass fed butter, ghee, coconut oil, and tallow. At the same time, boost your antioxidant defenses by eating garlic, onions, and pasture-raised eggs. These foods give your body the building blocks to produce glutathione, your brain’s main defense system against iron-triggered damage.
You can also add molecular hydrogen to your daily routine. Hydrogen activates your body’s own healing system by switching on glutathione — especially important when chronic illness and oxidative stress have shut those systems down. Whether through hydrogen-rich water or tablets, this approach helps reactivate your brain’s defense systems where they’re needed most.
By actively lowering excess iron, restoring mineral balance, and strengthening your antioxidant defenses, you protect your brain from the inside out. These steps are simple, actionable, and backed by clear biological mechanisms. Start with testing, make the dietary swaps, and stay consistent — your future brain will thank you.
FAQs About Iron and Alzheimer’s Disease
Q: What does iron have to do with Alzheimer’s disease?
A: Excess iron in your brain causes oxidative damage by reacting with fats and proteins in brain cells. This process leads to neuron death and helps trigger the development of Alzheimer’s. The damage is especially severe in areas responsible for memory and decision-making.
Q: What did the new study find about brain iron and Alzheimer’s?
A: The study found that individuals with both Down syndrome and Alzheimer’s had double the brain iron compared to those with Alzheimer’s alone. The extra iron was linked to faster and more severe buildup of brain plaques, greater cell damage from stress, and weaker natural protections in the brain.
Q: Where does all this excess iron come from?
A: Tiny, undetected brain bleeds (microbleeds) appear to be a key source. When blood leaks into brain tissue, iron from hemoglobin is released and stored locally, causing long-term oxidative stress. People with Down syndrome-related Alzheimer’s had a threefold increase in the enzyme that processes blood-derived iron, suggesting chronic internal bleeding contributes to iron buildup.
Q: How can I find out if I have high iron levels?
A: Start by testing your ferritin, the storage form of iron. Ideal levels fall between 60 and 75 ng/mL. You should also request a GGT test to measure oxidative stress. High ferritin and GGT together suggest your body is not safely managing iron, which impacts brain health.
Q: What steps can I take to reduce the risk of iron-driven brain damage?
A: Donate blood regularly or ask for therapeutic phlebotomy if your ferritin is high. Balance iron with copper-rich foods or supplements, increase calcium from whole food sources, eliminate vegetable oils, and boost antioxidants like glutathione. You can also use molecular hydrogen to reactivate antioxidant enzymes and help your brain neutralize oxidative stress.