# Electron transport chain

Category: Metabolism

Also known as: ETC, respiratory chain

Electron transport chain (ETC) is the mitochondrial process whose speed of electron flow, not its static ATP output, determines cellular health. Peat argued that the chain passes electrons from fuel to oxygen, producing heat, carbon dioxide, and ATP, but it cannot function…

12 passages · 2 authors · 2009–2026 · Most-cited: [Georgi Dinkov](https://bioenergeticoracle.com/md/voices/georgi-dinkov/index.md)

Canonical page: https://bioenergeticoracle.com/concepts/electron-transport-chain

## Synthesis

**Electron transport chain** (ETC) is the mitochondrial process whose *speed of electron flow*, not its static ATP output, determines cellular health. [Source 3] Peat argued that the chain passes electrons from fuel to oxygen, producing heat, carbon dioxide, and ATP, but it cannot function without **thyroid hormone**. [Source 2, 4] Dinkov has written that mainstream medicine’s focus on ATP levels is a reductionist error; the very act of respiring intensely — the rapid electron flow and high oxygen consumption — is what keeps cells in a functionally primed state, independent of ATP yield. [Source 3]

When operating properly under thyroid and oxygen, the ETC involves extensive free radical activity that is *productive and protective*, safely shepherding electrons directly to oxygen. [Source 2, 4] Peat explained that carbon dioxide plays a crucial structural role here: it retracts the electrons so that oxygen doesn’t stick improperly, preventing them from deviating and attacking **polyunsaturated fats** to cause the free radical damage people take antioxidants for. [Source 1] In this optimal state, the essential electron-moving co-factor NAD/NADH remains more oxidized, meaning oxygen is doing its work better. [Source 1] Conversely, in a low-thyroid or oxygen-deficient state, the electrons wander off the chain, attacking the fats that make up the mitochondrion and forming randomly destructive **lipid peroxides**. [Source 4]

A buildup of unpaired electrons drives reactive oxygen species (ROS) generation, and the ETC is uniquely vulnerable because it lacks an emergency disposal mechanism for excess electrons. [Source 9] Dinkov notes that while glycolysis and the Krebs cycle can shunt excess electrons into lactate or de-novo fat synthesis, a blockade in the ETC causes electrons to leak through the mitochondrial membrane and wreak havoc. [Source 9] This is why *low oxidative metabolism*, not high, creates the oxidative stress that drives aging and disease. [Source 9] Inhibiting complex I of the ETC reliably reproduces core symptoms of bipolar disorder, and the SARS-CoV-2 virus selectively disables this same complex, explaining why energetically compromised patients are at severe risk. [Source 6, 10]

The ETC’s function is intimately tied to the **NAD+/NADH ratio** and the availability of electron carriers. [Source 12] Dinkov and Roddy have described how electrons from carbohydrate metabolism are carried through glycolysis to pyruvate, then through the Krebs cycle and ETC to cytochrome C oxidase, with the entire process reinforcing cellular structure. [Source 7] A high NAD+ to NADH ratio is required for good electron flow; when stress increases lipolysis, the oversupply of fats blocks glucose oxidation and creates *reductive stress*, a state where electrons build up behind a blockade. [Source 12] Excessive fatty acid oxidation also consumes FAD, dropping the FAD/FADH ratio and blocking electron flow through ETC II, which directly triggers cellular senescence. [Source 11]

Peat emphasized that the ETC is not a static bag of molecules but an intricate, constant flow from fuel to oxygen that is disrupted by the very act of measurement. [Source 5] He noted that Szent-Györgyi’s work showed ATP causing muscle contraction without breaking its bond structure, hinting at a role for the ETC’s structured energy beyond simple chemical currency. [Source 5] Substances like **methylene blue** can bypass complex I defects, and vitamin B2 (riboflavin) can restore ETC II activity to prevent aging, demonstrating that restoring electron flow is a key therapeutic principle. [Source 8, 10, 11]

## People also ask

### How does thyroid hormone affect the electron transport chain?

Peat argued that the electron transport chain cannot function without thyroid hormone, which supports the rapid electron flow and high oxygen consumption that keep cells in a healthy, primed state.

### Why does low oxidative metabolism cause oxidative stress?

The entry explains that a blocked or sluggish electron transport chain lacks a way to dispose of excess electrons, causing them to leak and generate damaging reactive oxygen species, whereas intense respiration safely shepherds electrons to oxygen.

### What role does carbon dioxide play in mitochondrial health?

Peat described carbon dioxide as structurally retracting electrons so oxygen does not stick improperly, which prevents electrons from deviating to attack polyunsaturated fats and cause free radical damage.

## Related concepts

- [Krebs cycle](https://bioenergeticoracle.com/md/concepts/krebs-cycle/index.md)
- [Albumin](https://bioenergeticoracle.com/md/concepts/albumin/index.md)
- [Bohr effect](https://bioenergeticoracle.com/md/concepts/bohr-effect/index.md)
- [Cancer metabolism](https://bioenergeticoracle.com/md/concepts/cancer-metabolism/index.md)
- [Cascara Sagrada](https://bioenergeticoracle.com/md/concepts/cascara-sagrada/index.md)
- [Cellular respiration](https://bioenergeticoracle.com/md/concepts/cellular-respiration/index.md)

## Cited passages

Passage numbers match the `[Source N]` markers in the synthesis above.

### Source 1 — Ask the Herb Doctor: Altitude (July 2013)

Ray Peat · Interview · 2013

> **Ray Peat:** Yeah, so if, for example, in the heart, when you increase the amount of CO2 in your blood, you increase the actual amount of oxygen in the heart; it delivers the oxygen to the heart but more important than that is that it delivers it in the optimum way. It makes the oxygen go to the right places in the heart because it’s having the same effect on the heart proteins that it has on the haemoglobin and it retracts the electrons so that the oxygen doesn’t stick – or it shouldn’t -­ the electrons go directly to the oxygen down the electron transport chain and the electrons are prevented from deviating and getting off and attacking the polyunsaturated fats, which is what causes the bad oxidation that people take antioxidants for.
>
> **Sarah Johannesen Murray and Andrew Murray:** That’s the free radical damage, isn’t it?
>
> **Ray Peat:** Yeah.
>
> **Sarah Johannesen Murray and Andrew Murray:** .....that people know about, so free radical damage is where the electrons are free to interact with things that cause harm, whereas the presence of an increased amount of CO2 actually prevents those electrons from becoming wild and reacting with harmful, or the good tissues.

### Source 2 — Endotoxin, Free Radicals, and Inflammation — KMUD July 2009

Ray Peat · Interview · 2009 · http://www.l-i-g-h-t.com/files/herb-doctors-bowel-endotoxinnew.mp4

> **Andrew Murray:** Is that the electron transport chain? The NADH and that other cycle?
>
> **Ray Peat:** Yeah, the electrons pass from that, down to oxygen, but it can't do it without thyroid. The temperature is one of the factors, when you run the electrons, through the system, you produce heat as well as carbon dioxide and ATP; and keeping the temperature up is one of the things that helps to turn off the production of nitric oxide and other free radicals destructive factors.
>
> **Caller:** Those things interfere with our oxygen usage, is that correct?
>
> **Ray Peat:** Yeah, not all free radicals are toxic, but nitric oxide - the one that is so widely produced in response to stress - increases greatly with aging too, just because aging involves progressive stress reactions.
>
> **Andrew Murray:** What about Poppers?
>
> **Ray Peat:** Nitroglycerin has been used as a drug to open the circulation to the heart, and nitric oxide didn't really get much interest scientifically until Viagra came along, that's basically doing the same thing as nitroglycerin but it's extremely toxic, it's just like eating toxins, getting irradiated, and getting old ahead of time.

### Source 3 — Metabolic (OXPHOS) speed/rate, not ATP levels, determines health (and keeps cancer in check)

Georgi Dinkov · Article · May 23, 2026 · https://haidut.me/?p=3039

> Mainstream “mitochondrial medicine” is almost exclusively obsessed with ATP levels. The assumption is that mitochondria are important only because they produce energy, and that the only metric that matters is how much ATP a cell can generate. Ray has argued for years that this is a fundamentally reductionist and flawed view. What actually matters is metabolic rate — the speed of electron flow through the electron transport chain (ETC), the rate of oxygen consumption, and the efficiency of oxidative phosphorylation as a process, not the static levels of its end products. A cell can have high ATP but be metabolically stagnant (low electron flow, high reductive stress). Conversely, a cell can have lower ATP but be metabolically active (high electron flow, high oxidative capacity).
>
> The study below, published in Cell Metabolism and led by researchers at CNIC and IRB Barcelona, directly validates this view. They show that dendritic cells (the immune system’s sentinels) remain in a “ready-to-respond” state not because of ATP levels, but because of the flow of electrons through the mitochondrial respiratory chain. When they restored electron flow using an alternative enzyme (AOX) without increasing energy production, they recovered immune function. This is a direct experimental demonstration that metabolic speed, not ATP, determines cellular readiness and anti-cancer immunity.
>
> As the study below demonstrates, researchers found that a specific mitochondrial process — the flow of electrons through the respiratory chain — is essential to keep dendritic cells primed and ready to respond to threats like tumors. Using genetically modified mouse models and human dendritic cells, they showed that immune readiness does not depend primarily on energy production (ATP) , but on maintaining electron flow through the mitochondrial chain.
>
> This electron flow preserves the cell’s internal chemical balance, including redox state and metabolite levels. When they disrupted this balance, dendritic cells showed reduced activation, diminished migration to lymph nodes, and a weakened ability to stimulate T cells. As a result, anti-tumor immune responses were compromised.
>
> The most striking finding came when the researchers restored electron flow using an alternative enzyme (AOX) — without increasing ATP production. This manipulation recovered the cells’ ability to activate T cells and control tumor growth in mice. In other words, the speed of respiration itself, independent of ATP yield, determines immune function.
>
> This is exactly what I and Ray Peat have been saying for years.

### Source 4 — Endotoxin, Free Radicals, and Inflammation — KMUD July 2009

Ray Peat · Interview · 2009 · http://www.l-i-g-h-t.com/files/herb-doctors-bowel-endotoxinnew.mp4

> **Caller:** So it's just a potent free radical?
>
> **Ray Peat:** Some free radical can actually defend against the toxic free radicals. When thyroid and oxygen are working properly, the electron transport chain involves lots of free radical activity, but it's all productive and protective. The faster you run oxygen through the mitochondria and under the influence of thyroid, the less free radical damage you have to the structure of the cell and the mitochondrion. If you're low thyroid, or somehow lack oxygen acutely, the electrons instead of being safely passed through this chain of free radicals, the free radicals wander off and attack the fats that make up the mitochondrion; and then those fats become peroxides, which are some sort of a randomly destructive kind of free radical.
>
> **Caller:** So those fats that you talked about are polyunsaturated fats.
>
> **Ray Peat:** Those tend to accumulate in tissues, when they are given acutely, as an emulsion for example, they used to do in hospitals to fatten people up, now they do it to suppress their immune system as they transplant a kidney; they not only suppress immunity, they create instantaneous diabetes or inability to respire and use sugar.

### Source 5 — Ask the Herb Doctor: The Metabolism of Cancer

Ray Peat · Interview · Jul 15, 2016

> ## The History of Electrons in Biology
>
> **Sarah Murray:** So this process is going on with every breath we take, and every single cell in our body is moving these electrons from sugar or fat to oxygen?
>
> **Ray Peat:** Yes. When you try to measure the electrical energy of a cell—by sticking a needle in to measure voltage, for example—people have a static picture of the cell as a bag of randomized molecules. But what they are actually doing is disrupting this intricate, constant flow from fuel to oxygen. They are measuring an injured cell. Every time they try to stop it to fit their model, they destroy some cell process.

### Source 6 — Inhibiting respiration/metabolism reliably causes bipolar disorder

Georgi Dinkov · Article · Mar 3, 2021 · https://haidut.me/?p=1435

> Just a quick post on a study, which claims to have established a reliable method for inducing bipolar disorder in an animal model. This reliable method consists simply of administering a low-dose of a mitochondrial inhibitor. More specifically, an inhibitor of complex I of the electron transport chain (ETC). The chronic, low-dose administration reliably reproduced all core symptoms of bipolar disorder including mania, depression, anhedonia, anxiety, etc. So, the takeaway from the study is not only that bipolar disorder is most certainly of metabolic origin, but that even a mild inhibition of oxidative phosphorylation can reliably cause it. Considering the chronic stress most citizens in the “developed” world are subjected to on a daily basis, I am surprised that so few (relatively speaking) people have been diagnosed with that condition. But bipolar diagnosis numbers are skyrocketing, so in a twisted sense it is not a lost cause for psychiatry and its quest to convert every living person into a (preferably lifetime) patient. On the flip side, the study also suggests that improving the function of ETC, and more specifically of Comples I & II, may be a reliable treatment of bipolar disorder. One of the most effective therapeutic for Compl I & II deficiencies is methylene blue (MB). In corroboration for that hypothesis, MB has already been shown to be therapeutic for severe depression and possibly bipolar disorder in humans.
>
> [references]

### Source 7 — #15: NAD+/NADH Redox Balance, Vitamin D, Sugar, Genetic Determinism & Vitamin E with Georgi Dinkov

Georgi Dinkov · Interview · Jan 4, 2020 · https://open.spotify.com/episode/1gP8sg3BC6RsOGu46ePtCS

> **Georgi Dinkov:** Do you want me to go over the cycle?
>
> **Danny Roddy:** Okay, well, oxidation, loss of electrons, reduction, gain of electrons. But yeah, just your elevator pitch for NAD to NADH, glycolysis, pyruvate dehydrogenase, or the link reaction to Krebs, the electron transport chain, cytochrome C oxidase. cardiolipin, all that thing forming oxidative metabolism and that reinforcing our structure, basically race hypothesis, but in a more granular way.

### Source 8 — IdeaLabs Forum Q&A — Cardenosine

Georgi Dinkov · Forum Q&A · Feb 9, 2018

> **Epistrophy:** (2018-02-20) How would one know if there ETC is not working properly?
>
> **Georgi Dinkov:** (2018-02-20) Most people with malfunctioning ETC have high lactate, and symptoms of MELAS. MELAS syndrome - Wikipedia I don't know if there is a specific easily obtainable test to see if just ETC is working properly. Maybe @Travis / @Koveras / @Kyle M would know.
>
> **Kyle M:** (2018-02-21) The problem is in isolating someone's biopsied mitochondria, lots of variables. A crude test off the top of my head would be disappearance time of methylene blue, using the assumption that problem respiration is linked to a well-oxidized cell potential.
>
> **Georgi Dinkov:** (2018-02-21) Did anybody ever ask Peat about his opinion on using oral methylene blue as a health test? I wonder if he thinks it's reliable and what doses would indicate good health. What do you think?
>
> **Kyle M:** (2018-02-21) What would be the outcome you look for? I've only read him about the disappearance of MB color on skin is indicative of the oxidative potential of cells. That would only be at the skin though, and there may be many confounders such as extracellular reducing agents and extracellular oxidants competing with the MB. My gut feeling is that it's worth trying if someone has MB and doesn't mind a bit of blue on their skin for a while, but it would be more qualitative than quantitative.

### Source 9 — Low, not high, metabolism creates oxidative stress

Georgi Dinkov · Article · Oct 27, 2020 · https://haidut.me/?p=1277

> A hugely popular tenet of the “rate of living” theory is that the higher the metabolic rate the more reactive oxygen species (ROS) an organism produces. ROS elevation has already been implicated in a host of chronic disease including diabetes, CVD, cancer, neurological conditions and even mental health disorders. However, the explanation of higher ROS simply due to elevated metabolic rate just does not make much “structural” sense. Namely, in order to generate the superoxide radical the organism needs molecular oxygen and an excess of unpaired electrons. Similar requirements apply to the hydroxyl radicals as well. This suggests that a buildup of unpaired electrons drives ROS generation and such a buildup is usually driven by inability of electrons to freely flow from food to the “terminal electron acceptor” – oxygen. Blockade of electron flow in the step of glycolysis rarely occurs after birth and if it does it is universally lethal as no organism can survive without glycolysis working well. So, the remaining steps where such build up of electrons can occur are the pyruvate dehydrogenase (PDH) entry step into the Krebs cycle, the Krebs cycle itself, or electron transport chain (ETC). The PDH complex already has an efficient mechanism for “disposal” of excess electrons. Namely, using pyruvate as electron acceptor and generating lactate in the process. The Krebs cycle also has an efficient “disposal” mechanism – i.e. de-novo synthesis of fats from citrate through the activity of the enzyme fatty acid synthase (FAS). The emergency “disposal” mechanisms in both PDH and Krebs cycle are well-known to be upregulated in ALL chronic diseases but especially in diabetes and cancer. So, we know that those mechanisms are suboptimal but at least they exist and as such ROS generation at the PDH or Krebs cycle steps is highly unlikely. However, there does not seem to be such disposal mechanism in the final step of OXPHOS – i.e. the ETC. A buildup of electrons there has no resolution mechanism and eventually those electrons start to “leak” through the mitochondrial membrane, combine with oxygen and wreak havoc by generating ROS. While the main danger of ROS is lipid peroxidation for all cellular structure having lipids (PUFA) as a component, the also have the ability to structurally damage the ETC itself.

### Source 10 — COVID-19 is an energy deficiency disease

Georgi Dinkov · Article · Jun 9, 2021 · https://haidut.me/?p=1541

> Yet another seemingly non-metabolic disease turns out to be nothing but energy deficiency in disguise. Apparently, the SARS-CoV-2 virus selectively disables so-called complex I of the electron transport chain (ETC), and as such the overall OXPHOS process. Such inhibition is known to reliably increase the production of reactive oxygen species (ROS), which is known to lead to lipid peroxidation, hypercoagulation, and eventually cytokine storm in the most energetically compromised patients. As the study authors state, this explains why certain people with chronic conditions are at increased risk of severe COVID-19 or death – i.e. they are already in an energetically compromised state and COVID-19 greatly exacerbates the existing energetic deficiency. This suggests that chemicals like methylene blue (MB), which can bypass (and often rectify) complex I issues may be a viable treatment (and possibly prevention as well) for COVID-19, especially in already energetically compromised patients. MB has already been shown to be able to directly kill the virus, which makes it that much more appropriate as a therapeutic intervention. Unfortunately, the ongoing human clinical trials with MB for COVID-19 use very high doses (100mg several times daily), which increase the risk of elevating serotonin and the latter is already known to be a major risk factor for COVID-19 exacerbation and/or subsequent death. Considering most human trials with MB found no benefit beyond 15mg daily (even for a severe disease such as Alzheimer’s), I think a much more sensible approach would be to take say 5mg and spend a few hours in the sun, thus implementing the so-called photodynamic therapy, which Pfizer recently patented as a viable treatment for cancer.
>
> [references]

### Source 11 — Fasting causes aging by energy depletion, vitamin B2 can stop it

Georgi Dinkov · Article · Dec 21, 2021 · https://haidut.me/?p=1711

> Conversely, having insufficient levels of FAD (and/or low FAD/FADH ratio) can effectively block the ETC. This crucial role of FAD in the ETC demonstrates why excessive fatty acid oxidation (FAO) is harmful. Namely, FAD is consumed in the process of beta-oxidation of fatty acids and as such excessive FAO can consume too much FAD, drop the FAD/FADH ratio, and thus block electron flow through ETC. This reduction/blockade of ETC is exactly what is seen in most chronic, degenerative diseases, but especially in conditions such as cancer, diabetes, Alzheimer’s disease, autoimmune conditions, etc. Well, the study below found that this reduction of mitochondrial activity (ETC) is exactly what triggers the senescence process, and activating mitochondria (specifically ETC II) by supplementing vitamin B2 prevented cellular aging. Here is the actual explanation from the study authors.
>
> [references]
>
> Now, I did mention that the study bashes fasting, right? Where in the study does it say so? Well, the study does not use the word “fasting” but refers to it through its chief biochemical mechanism. Namely, the study demonstrated that stress activates an enzyme known as AMPK. This enzyme is like a sensor for when the energy levels in the cell drop…as in during fasting. High mitochondrial activity apparently keeps AMPK suppressed, while reduced mitochondrial activity activates AMPK and that triggers the initiation of senescence processes. Well, fasting is well-known to activate AMPK and there is a multi-billion dollar industry out there trying to come up with “fasting-mimetic” drugs/supplements that activate AMPK.
>
> [references]
>
> The study below is one of the few I have seen so far that directly implicate fasting as a stressor that directly causes aging. This is in direct contrast to what is being promoted on TV and by most public health officials – i.e. fasting is the only known mechanism through which aging can be delayed. As usual, the truth seems to be 180 degrees from what is being pushed on the public…
>
> [references]

### Source 12 — How To Unblock Your Metabolism - Georgi Dinkov

Georgi Dinkov · Interview · May 8, 2024 · https://www.youtube.com/watch?v=skeXyC1_MVA

> **Strong Sista 1:** OK, I think we should clarify a few things for our audience. So the first thing is like this state that cells are in. George, you brought up the word reductive stress. And so it's important to remember that the food that we consume is essentially just like high energy electrons. And ideally, like. That's a lot of energy. It can be really damaging. But the way that good metabolism works is that those electrons are flowing very quickly through the electron transport chain all the way to the end, the oxygen. And ATP. We get ATP and we get carbon dioxide. And so we want those electrons to flow well.
>
> **Georgi Dinkov:** Yeah, as quickly as possible.
>
> **Strong Sista 1:** Yes. When we're in reductive stress, there's a block. And so the electrons build up. And in order to have good electron flow and not have that block, we need a high NAD plus to NADH ratio. And so I think it's helpful to understand that, to understand why the B vitamin supplementation has helped repress these tumors that you've seen in the studies. Vitamin B3 helps increase that NAD+, which then gives more electron carriers to help move those electrons through. But then I'm still confused.

_Generated 2026-07-20 from the Bioenergetic Oracle corpus._