Fatigue isn’t always about needing more sleep or another cup of coffee.
Sometimes it’s about dead batteries at the cellular level—specifically, dysfunctional mitochondria that can’t produce energy efficiently.
In a recent video, Dr. Ashley Frawley, a board-certified primary care physician, explained why pouring supplements into a system with damaged mitochondria is like trying to charge a phone with a broken battery.
She breaks down exactly where energy production fails and which interventions—from NAD to cold plunges—actually target the root problem.
Jump to:
- The Mitochondrial Structure: Why Shape Matters
- Fixing the Outer Membrane: The Foundation of Energy Production
- The Inner Membrane: Where Energy Gets Won or Lost
- The Electron Transport Chain: Your Energy Assembly Line
- The Mitochondrial Matrix: Where Food Becomes Fuel
- When Energy Production Creates Damage
- Mitophagy: Your Cellular Cleanup Crew
- Mitochondrial Biogenesis: Building New Power Plants
- Matching Interventions to Specific Problems
The Mitochondrial Structure: Why Shape Matters
Mitochondria aren’t just tiny blobs floating around cells. Their bean-like shape features two distinct walls: a smooth outer membrane and a heavily folded inner membrane.
Dr. Frawley describes the outer wall as “the front door to your energy factory.” It’s porous and fluid, allowing fuel, nutrients, and signals to pass through tiny openings.
If you want something simple that actually works, this is one of the most effective tools I’ve used to build strength, conditioning, and endurance without needing a full gym setup.
- Full-body training with one weight using swings, squats, and presses
- Solid cast iron build that feels stable and lasts for years
- Comfortable grip that makes high-rep workouts easier to handle
Between these two walls sits the inner membrane space—essentially a loading dock for energy production. But chronic inflammation, aging, insulin resistance, and poor metabolic health can stiffen this outer membrane, preventing proper function.
Sometimes fatigue doesn’t start because your mitochondria can’t make energy. Sometimes it starts because of this. I call it signal interference.
Before supplements like CoQ10 or NAD can work effectively, that front door needs to function properly.
Fixing the Outer Membrane: The Foundation of Energy Production
Dr. Frawley explains that changing the lipid composition of the outer membrane requires specific nutritional interventions. Think of it as maintaining a fluid security fence—if it gets packed with wrong fats or becomes rigid from inflammation, the gates rust shut.
Her recommendations for supporting outer membrane health include:
- Antioxidants: Berries and colorful foods protect against structural degradation
- Omega-3 fatty acids: Fish like sardines or high EPA/DHA supplements maintain membrane fluidity
- Phosphatidylcholine: A supplement that provides the primary building block of mitochondrial membranes
The Inner Membrane: Where Energy Gets Won or Lost
Unlike the smooth outer wall, the inner membrane is intensely wrinkled. These folds, called cristae, resemble an accordion—and they’re completely intentional.
Dr. Frawley emphasizes that these wrinkles create massive surface area within a small space. More folds mean more room for energy-producing engines, which translates to more ATP production and better energy levels.
If you want something simple that actually works, this is one of the most effective tools I’ve used to build strength, conditioning, and endurance without needing a full gym setup.
- Full-body training with one weight using swings, squats, and presses
- Solid cast iron build that feels stable and lasts for years
- Comfortable grip that makes high-rep workouts easier to handle
Research shows healthy mitochondria have tightly organized cristae with deep folds. In damaged, stressed, or aging mitochondria, those folds flatten out dramatically.
The accordion loses its shape, and it can’t make good music anymore. Or your mitochondria have less ATP production.
Here’s where Dr. Frawley delivers surprising news: exercise dominates supplements for improving mitochondrial structure. Consistent physical activity sends powerful signals that improve cristae organization over time.
The Electron Transport Chain: Your Energy Assembly Line
Even perfectly folded cristae need machinery to produce energy. That’s where the electron transport chain comes in—a five-station assembly line living on the inner mitochondrial membrane.
When you eat food, your body breaks it down into NADH and FADH2—energy delivery trucks carrying hydrogen atoms (one proton plus one electron each). At complex one, NADH drops off electrons that move through the assembly line while protons get pumped across the membrane.
This separation creates stored potential energy, like pumping water uphill into a reservoir. Eventually, protons rush back through complex five, spinning a turbine that creates ATP as long as electrons keep moving down the line.
Where Supplements Enter the Story
Complex one sustains the most damage from aging and inflammation. Dr. Frawley explains how specific supplements target this vulnerability:
If you want something simple that actually works, this is one of the most effective tools I’ve used to build strength, conditioning, and endurance without needing a full gym setup.
- Full-body training with one weight using swings, squats, and presses
- Solid cast iron build that feels stable and lasts for years
- Comfortable grip that makes high-rep workouts easier to handle
CoQ10 shuttles electrons through the assembly line, keeping traffic moving efficiently. Statin medications block natural CoQ10 production, which is why supplementation is recommended for people taking cholesterol drugs.
Methylene blue picks up electrons stuck in damaged complexes and moves them along the assembly line—a mechanism many people don’t understand.
The goal here isn’t to create ATP directly. The goal is to keep the assembly line moving efficiently.
The Mitochondrial Matrix: Where Food Becomes Fuel
Past the inner membrane lies the mitochondrial matrix—the soup in the middle where food actually gets processed. This area contains the Krebs cycle (also called citric acid or TCA cycle), where food breaks down into NADH and FADH2.
NAD supplementation supports this process, but Dr. Frawley clarifies a common misconception: NAD supplements don’t create energy from nowhere. They simply provide support for the assembly line by eventually becoming NADH, one of the main energy delivery trucks feeding the electron transport chain.
When Energy Production Creates Damage
Mitochondria contain their own DNA separate from the cell nucleus. Unfortunately, this DNA sits right where damage accumulates.
About 1-2% of oxygen moving through the energy production system leaks out, creating reactive oxygen species (ROS)—tiny sparks flying off machinery. Small amounts are normal and even useful for signaling, but excessive stress, poor diet, bad sleep, and inflammation cause constant sparking.
If you want something simple that actually works, this is one of the most effective tools I’ve used to build strength, conditioning, and endurance without needing a full gym setup.
- Full-body training with one weight using swings, squats, and presses
- Solid cast iron build that feels stable and lasts for years
- Comfortable grip that makes high-rep workouts easier to handle
Over time, excessive ROS damages mitochondrial DNA, cristae, and engine components. This creates a vicious cycle: more damage leads to more dysfunction, which produces more reactive oxygen species, feeding the cycle indefinitely.
Mitophagy: Your Cellular Cleanup Crew
Mitochondria aren’t permanent. Cells constantly kill off broken ones and build new replacements through a process called mitophagy—literally “eating mitochondria.”
Cells identify damaged mitochondria, tag them for removal, break them apart, and recycle useful pieces. It’s controlled demolition at the cellular level.
As people age, become sedentary, and develop metabolic dysfunction, this cleanup process slows dramatically. Broken mitochondria stick around creating inflammatory byproducts instead of being replaced by efficient workers.
Worse yet, dysfunctional mitochondria can create more dysfunctional mitochondria, compounding the problem exponentially.
Mitochondrial Biogenesis: Building New Power Plants
While mitophagy handles demolition, mitochondrial biogenesis handles construction—literally creating new mitochondria. The master switch controlling this process is PGC1 alpha.
If you want something simple that actually works, this is one of the most effective tools I’ve used to build strength, conditioning, and endurance without needing a full gym setup.
- Full-body training with one weight using swings, squats, and presses
- Solid cast iron build that feels stable and lasts for years
- Comfortable grip that makes high-rep workouts easier to handle
When activated, PGC1 alpha signals cells to build more power plants. Exercise, fasting, cold exposure, higher NAD levels, and certain peptides can all activate this process.
This is where urolithin A becomes relevant. Produced by gut bacteria when eating foods like pomegranates, urolithin A helps identify and remove mitochondria that should no longer be present.
You don’t always have to focus on boosting the engine. Sometimes you do need to focus on mitophagy and then boosting the energy.
Matching Interventions to Specific Problems
Dr. Frawley emphasizes there isn’t one best mitochondrial supplement—just different interventions targeting different machine parts.
- Membrane problems: Omega-3s, phosphatidylcholine, improved metabolic health
- Flattening cristae: Exercise is critical; certain peptides can help stabilize structure
- Slowing engines: CoQ10, riboflavin, potentially methylene blue (consult a doctor first)
- Matrix support or NAD needs: NMN supplements
- Quality control issues: Urolithin A, fasting, cold exposure, and exercise for removing damaged mitochondria and building new ones
Understanding mitochondrial anatomy transforms random supplement throwing into targeted intervention. Instead of hoping something works, you’ll know exactly which part of the energy-production machine needs fixing—and which tools actually address that specific problem.
