I recently had a great conversation with Alex Kikel that got me thinking, membrane potential is one of the most referenced yet least understood concepts in mitochondrial biology. We throw around numbers like “-150 mV” or “polarized vs. depolarized” as if that explains anything. But if you’re not rooted in the mechanisms, it’s noise. This article is meant to demystify membrane potential, what it actually is, what builds it, what breaks it, and why structure determines whether it even matters. Let’s begin at the core: membrane potential is the electrical charge across the inner mitochondrial membrane (IMM). It’s not the cause of energy production, it’s the result of a system working in sync. And that system only works if structure, morphology, and proteomic integrity are intact. The IMM is lined with proteins from the electron transport chain (ETC) (Complexes I through IV) which pass electrons downstream, pumping protons (H⁺) from the matrix into the intermembrane space. This creates a proton gradient, separating charge across the membrane. That separation is membrane potential an electrochemical voltage that becomes the force used to make ATP via Complex V (ATP synthase). But it’s not just about voltage. It’s about stoichiometry. Think of membrane potential as pressure in a hose. If the hose is kinked, or the nozzle is leaky, pressure becomes meaningless. In mitochondria, that pressure only becomes useful if: 1. Electrons flow properly (via NADH/FADH₂ donation), 2. Protons are pumped efficiently (via structurally competent complexes), and 3. The ATP synthase turbine is functional and matched to demand. Structure comes first. If cristae (the folds of the IMM) are damaged, the spatial orientation of ETC complexes falls apart. The distance between proton pumps and ATP synthase increases, electron slippage occurs, and ROS increases. You can’t maintain meaningful membrane potential when architecture collapses. This is where morphology and fusion-fission dynamics enter.

Nuanced question. Dihydroberberine or Metformin when considering glucose/lipid modulating effects for longevity around a protocol involving strength training, HIIT, and some zone 2. I know the research tends to describe Metformin being more detrimental to exercise adaptations, but is this known similarly with DHB? I know Dr. Seeds is not a fan of Metformin d/t some negative mitochondrial changes that can occur. @Anthony Castore

If you’ve ever watched a great coach or a great clinician work, you’ll notice something they don’t stare harder; they see differently. They aren’t simply looking for more data; they’re trying to understand the rhythm beneath the data. Biology, especially mitochondrial biology, is a dance long before it becomes a number on a lab report. This article is about learning to see that dance. To understand how SS-31, methylene blue, ketone esters, and even your training decisions interact with real cellular dynamics, you need to know one thing above all else: Biology doesn’t run on quantity, it runs on phase. This is the part that confuses even very smart people. We’re trained to think that oxidative stress = bad, antioxidants = good, more oxygen = good, more ATP = good. But life is rhythmic, not linear. Your mitochondria aren’t furnaces they’re oscillators. They need to pulse. They need to switch between states. They need to signal, respond, tighten, release, and tighten again. This is why a supplement, a peptide, or a drug can work beautifully in one phase of physiology and completely derail things in another. To understand this, we need to talk about one of the most underrated molecules in all of human physiology: cardiolipin. CARDIOLIPIN: THE CONDUCTOR OF THE MITOCHONDRIAL ORCHESTRA Cardiolipin is a special lipid that lives almost exclusively in the inner mitochondrial membrane. If the mitochondrial membrane were a concert hall, cardiolipin would be the acoustic paneling that allows the orchestra to play in tune. It has four fatty acid tails, which is extremely rare most lipids have two. That design allows it to shape the membrane into cristae, those elegant folds where electron transport happens. These folds aren’t random architecture; they control the spacing, alignment, and speed of electron flow. Without cardiolipin, the ETC complexes would be like a bunch of musicians sitting in the wrong seats. Even more importantly, cardiolipin is both a sensor and a switch. When it is oxidized in the right way, it helps signal adaptation. When it is oxidized in the wrong way, it collapses mitochondrial membrane potential, releases cytochrome c, and pushes the cell toward apoptosis. This is why tools that interact with cardiolipin like SS-31 are profoundly powerful but profoundly phase-dependent. They’re not like taking creatine or magnesium; they actively alter the structural language of the mitochondria.

Most conversations about mitochondria start in the wrong place. They start with energy production, ATP output, or how to “boost” mitochondria. That framing misses the real problem. Mitochondria don’t usually fail because they can’t make energy. They fail because the physical structure that allows energy to be made cleanly and efficiently becomes unstable. Once structure is compromised, every attempt to push energy production creates more noise, more oxidative stress, and more dysfunction. This is why people can have “normal” labs yet feel exhausted, wired, inflamed, or unable to recover. The issue isn’t fuel. It’s architecture. To understand this, we need to zoom in to the level of mitochondrial structure. Inside every mitochondrion is an inner membrane that folds inward into structures called cristae. These folds are not random. They are precisely shaped, tightly regulated, and essential for efficient energy production. Cristae dramatically increase surface area, but more importantly, they organize the electron transport chain into coherent, functional units. The electron transport chain is not just a series of enzymes floating in space. It is a spatially organized system embedded in the inner membrane. Distance between complexes, membrane curvature, lipid composition, and membrane tension all matter. A helpful analogy is an accordion. When the folds are evenly spaced, elastic, and well aligned, air flows smoothly and predictably. When the folds become stiff, warped, or collapsed, airflow becomes turbulent and inefficient. The same thing happens with electrons inside mitochondria. Electrons enter the electron transport chain and move through complexes I, II, III, and IV. As they move, they pump protons across the inner membrane, creating a proton gradient called membrane potential. ATP synthase then uses that gradient to produce ATP. When cristae structure is intact, electrons flow smoothly, protons are distributed evenly, ATP is produced efficiently, and reactive oxygen species remain low. When cristae structure is compromised, electrons leak, protons accumulate unevenly, membrane potential becomes excessive or unstable, and reactive oxygen species rise.

Hi all. Am curious if folks have protocols to improve mitochondrial efficiency without using peptides. Ie eating sardines, taking coq10, ensuring 7-9 hours of sleep etc. Would be very interested in understanding how Folks think about what they are taking (intended effect), timing and dosage. I saw a few historical posts touching on this but nothing that got into the details Of the why and how.