Exercise, certain dietary patterns, targeted supplements, and a handful of environmental exposures all send signals that push your cells to build more mitochondria and improve the ones you already have. The core biological trigger behind most of these strategies is a signaling cascade involving a molecule called PGC-1α, often described as the master switch for mitochondrial biogenesis. Two sensors in your cells, AMPK and SIRT1, activate PGC-1α when they detect energy stress, and nearly every evidence-backed approach to boosting mitochondria works, at least in part, by flipping one or both of those sensors on. But the picture extends beyond just making more mitochondria. Your cells also rely on quality-control systems that recycle damaged ones and reshape existing ones, and supporting those processes matters just as much as raw production.
How Your Cells Produce Energy in the First Place
Mitochondria generate the vast majority of your body’s usable energy in the form of ATP. They do this through a chain of protein complexes embedded in their inner membranes, collectively called the electron transport chain. Nutrients from food are broken down into molecules that feed electrons into this chain, and as the electrons pass through each complex, they drive a flow of protons that ultimately powers an enzyme called ATP synthase. The whole process, oxidative phosphorylation, is remarkably efficient, but its output depends on having enough healthy mitochondria with intact membranes and functioning protein complexes. When mitochondria are damaged, sparse, or poorly maintained, your cells produce less ATP and generate more harmful byproducts called reactive oxygen species.
Exercise Is the Most Powerful Mitochondrial Signal
If you could only do one thing to improve your mitochondria, the answer would be exercise. Physical activity is the strongest, most consistently supported stimulus for mitochondrial biogenesis and remodeling in human skeletal muscle. Both aerobic training and resistance training produce measurable improvements, though they do so through somewhat different routes.
A 2025 study comparing high-intensity interval training and moderate-intensity continuous training found that both formats increased mitochondrial content and volume density in skeletal muscle after just six weeks. Before training, the mitochondrial network in muscle fibers looked sparse and fragmented. After moderate continuous training, it reorganized into a grid-like structure. After high-intensity intervals, the network took on a different pattern, with stronger longitudinal connections. High-intensity training also produced a more pronounced shift in the molecular markers of mitochondrial fusion and fission, the processes that reshape the mitochondrial network.
1PubMed Central. Effects of high-intensity interval training and moderate-intensity continuous training on mitochondrial dynamics in human skeletal muscleResistance training, long assumed to benefit only muscle size and strength, also improves mitochondrial function. One study found that resistance exercise roughly doubled coupled mitochondrial respiration supported by complex I, and increased abundance of complex I protein in skeletal muscle. Transcripts involved in electron transfer and energy production also rose after training.
2PubMed Central. Resistance Exercise Training Alters Mitochondrial Function in Human Skeletal Muscle A broader review of the evidence confirms that traditional high-load resistance exercise stimulates mitochondrial biogenesis and improves respiratory function in muscle tissue.3PubMed Central. Impact of Resistance Training on Skeletal Muscle Mitochondrial Biogenesis, Content, and Function
The practical takeaway is that you do not have to choose between cardio and weights for mitochondrial benefit. Both help, and combining them likely covers more of the relevant signaling pathways than either alone. If you are starting from a sedentary baseline, any increase in regular physical activity is probably the single highest-impact change you can make for your mitochondria.
Dietary Patterns That Drive Mitochondrial Renewal
Eating less, or eating within restricted windows, triggers some of the same energy-sensing pathways that exercise does. Calorie restriction is one of the most studied dietary interventions in mitochondrial biology. Research has shown that calorie restriction stimulates the proliferation of mitochondria through the PGC-1α signaling pathway while simultaneously reducing oxidative stress. The new mitochondria produced under calorie restriction appear to be unusually efficient: they consume less oxygen, generate fewer reactive oxygen species, and yet maintain their ATP output.
4PubMed Central. Calorie restriction induces mitochondrial biogenesis and bioenergetic efficiencyBeyond building new mitochondria, calorie restriction and fasting also activate the cleanup crew. A literature review examining the effect of fasting and calorie restriction on mitophagy, the process by which cells selectively destroy damaged mitochondria, found that most studies reported increases in mitophagy and its related markers. The reviewers concluded that fasting and calorie restriction have a promising role in preventing age-related diseases by clearing out dysfunctional mitochondria across different organs.
5PubMed Central. The effect of fasting or calorie restriction on mitophagy induction: a literature reviewKetogenic diets, which shift the body’s primary fuel source from glucose to fat, also affect mitochondrial behavior. In mice fed a ketogenic diet, peripheral nerves showed reduced oxygen consumption and lower production of hydrogen peroxide, a reactive oxygen species, when metabolizing fat-based fuels compared to mice on a standard diet. Gene expression changes in the electron transport chain, particularly in complexes I and IV, appeared to underlie this shift.
6PubMed Central. Reduced mitochondrial reactive oxygen species production in peripheral nerves of mice fed a ketogenic dietIt is worth being realistic about how these findings translate to everyday life. Long-term calorie restriction is difficult to sustain and carries risks like muscle loss, nutrient deficiencies, and hormonal disruption. Intermittent fasting offers a more practical version of some of these benefits, though the human evidence specifically on mitophagy is still catching up to the animal data. Ketogenic diets come with their own trade-offs, including digestive issues and difficulty maintaining over months or years. The dietary strategies that seem most accessible for most people involve some degree of time-restricted eating and occasional periods of reduced caloric intake, rather than extreme or permanent restriction.
Supplements With Mitochondrial Evidence
The supplement landscape for mitochondrial health is crowded with marketing claims but thinner on rigorous human data. A few compounds, however, have a genuine mechanistic basis and at least preclinical evidence of effect.
NAD+ Precursors
NAD+ is a molecule your cells require for hundreds of metabolic reactions, including the ones inside mitochondria. Its levels decline with age, and that decline is linked to reduced mitochondrial function. Two supplements, nicotinamide riboside (NR) and nicotinamide mononucleotide (NMN), serve as building blocks your body can convert into NAD+. In mice, worms, and cultured human cells, treatment with NR has increased mitochondrial function and biogenesis and turned on stress-response genes that protect mitochondria.
7PubMed Central. The role of NAD + metabolism and its modulation of mitochondria in aging and diseaseNMN has been studied in mouse models of both aging and disease. In aged mice, two weeks of NMN treatment activated genes involved in mitochondrial rejuvenation and anti-inflammatory pathways in brain blood vessels, and improved cerebral blood flow.
8PubMed Central. Nicotinamide mononucleotide (NMN) supplementation promotes neurovascular rejuvenation in aged mice: transcriptional footprint of SIRT1 activation, mitochondrial protection, anti-inflammatory, and anti-apoptotic effects In Parkinson’s disease models, NAD+ boosters including NMN improved mitochondrial quality control, reduced inflammation, and inhibited cell death. In living mice with chemically induced Parkinson’s symptoms, NMN supplementation reduced motor deficits and slowed disease progression through a mitochondrial stress-response pathway.9PubMed Central. NAD+-Boosters Improve Mitochondria Quality Control In Parkinson’s Disease Models Via Mitochondrial UPR
The caveat is that most of this evidence comes from animal models or cell cultures, not from large human trials. Several small human studies have shown that NR and NMN do raise blood NAD+ levels, but whether that translates into the same mitochondrial improvements seen in mice remains an active area of research.
Coenzyme Q10
CoQ10 is not an external add-on to your mitochondria; it is already embedded in them. It sits within the electron transport chain, shuttling electrons between complexes, and also acts as an antioxidant throughout the cell.
10PubMed Central. Metabolic Targets of Coenzyme Q10 in Mitochondria Your body produces its own CoQ10, but production drops with age, and certain medications, particularly statins, can lower levels further. Supplementation has been studied primarily for its antioxidant role and its ability to reduce oxidative stress.11PubMed Central. Coenzyme Q10 Supplementation for the Reduction of Oxidative Stress: Clinical Implications in the Treatment of Chronic Diseases The logic for supplementing is strongest when your own production is compromised, whether from aging, statin use, or specific genetic conditions affecting CoQ10 synthesis.
Urolithin A
Urolithin A is a metabolite produced by gut bacteria when they break down compounds found in pomegranates, walnuts, and certain berries. Not everyone’s gut microbiome produces it efficiently, which is why supplemental forms have attracted research interest. Unlike the supplements above, urolithin A’s main effect is not on making new mitochondria but on clearing out damaged ones. It activates mitophagy, and this cleanup has been shown to improve muscle function across species in both experimental models and clinical studies.12PubMed Central. Mitophagy Activation by Urolithin A to Target Muscle Aging In models of muscular dystrophy, urolithin A rescued impaired mitophagy, increased skeletal muscle respiratory capacity, and improved muscle stem cells’ ability to regenerate tissue.13PubMed. Urolithin A improves muscle function by inducing mitophagy in muscular dystrophy
Alpha-Lipoic Acid and Acetyl-L-Carnitine
These two compounds have been studied individually for years, but a notable finding is what happens when they are combined. In a cell model of Parkinson’s disease, alpha-lipoic acid and acetyl-L-carnitine together worked at concentrations 100 to 1,000-fold lower than either required alone. The combination increased mitochondrial biogenesis, reduced reactive oxygen species, and counteracted the loss of complex I activity caused by a mitochondrial toxin, and it did so through upregulation of PGC-1α.14PubMed Central. Combined R-α–lipoic acid and acetyl-L-carnitine exerts efficient preventative effects in a cellular model of Parkinson’s disease This synergy is intriguing, though again the data is preclinical.
Cold, Heat, and Light
Your mitochondria respond to temperature and light exposure in ways that go beyond the expected “burn more calories in the cold” narrative.
Cold exposure activates brown adipose tissue, a type of fat densely packed with mitochondria. A 2025 study found that cold adaptation triggers metabolic rewiring across tissues, with brown fat in particular ramping up glucose utilization through remodeling of glycolysis and increased oxygen consumption. The mechanism involves a specialized protein, uncoupling protein 1, that allows mitochondria to burn fuel as heat rather than storing it as ATP.15PubMed Central. Cold exposure stimulates cross-tissue metabolic rewiring to fuel glucose-dependent thermogenesis in brown adipose tissue This does not necessarily mean you need ice baths; even regular exposure to mildly cool temperatures may stimulate brown fat activity over time.
Heat therapy, on the other hand, protects mitochondria you already have. In a study where one leg of each participant was immobilized, daily heat treatments prevented the loss of mitochondrial respiratory capacity that immobilization normally causes. The immobilized-only leg lost about a quarter of its coupled respiratory capacity, while the leg receiving heat treatment lost less than ten percent. Heat also prevented the decline of proteins across all five mitochondrial respiratory complexes and increased heat shock proteins that help maintain cellular integrity.16PubMed. Daily heat treatment maintains mitochondrial function and attenuates atrophy in human skeletal muscle subjected to immobilization
Red and near-infrared light, often marketed under the term photobiomodulation, acts on mitochondria through a specific target: cytochrome c oxidase, the final enzyme in the electron transport chain. Research has demonstrated that near-infrared light increases cytochrome oxidase production in cultured neurons and reverses the reduction in enzyme activity caused by metabolic inhibitors.17Mitochondrion. Mitochondrial signal transduction in accelerated wound and retinal healing by near-infrared light therapy The clinical evidence for photobiomodulation extends mainly to wound healing and tissue recovery, with some early work in neurodegeneration. The devices available to consumers range widely in quality and wavelength, and it is worth noting that the effective wavelengths studied in research (typically 630 to 850 nanometers) are specific, so not all red light panels deliver the same thing.
Sleep and Stress Are Not Optional
It is easy to focus on active interventions like exercise and supplements and overlook the passive requirements. Sleep deprivation measurably impairs mitochondrial function. Animal studies using various models of sleep deprivation show changes in gene expression, enzyme activity, and even the physical shape of mitochondria. Human data, though more limited, echoes this pattern: people who have undergone sleep deprivation or who suffer from insomnia show differences in the activity of oxidative phosphorylation enzymes and related protein levels.18PubMed. Mitochondria’s role in sleep: Novel insights from sleep deprivation and restriction studies If you are supplementing with NMN while chronically sleeping five hours a night, you are fighting biology with a teaspoon.
Chronic psychological stress similarly undermines mitochondrial health. In rodent models of depression, elevated stress hormones reduced brain mitochondrial function and lowered expression of both antioxidant enzymes and mitofusins, the proteins that allow mitochondria to fuse and share contents. The downstream effect was increased oxidative stress and reduced energy production in the brain.19PubMed. Corticosterone reduces brain mitochondrial function and expression of mitofusin, BDNF in depression-like rodents regardless of exercise preconditioning This connects to the well-documented observation that people with chronic stress and depression often report fatigue as a primary symptom. It is not “all in their head” in the dismissive sense; it is in their mitochondria.
How Your Cells Take Out the Trash
Building new mitochondria is only half the equation. Your cells also need to dismantle damaged ones before they become a source of harmful reactive oxygen species and inflammatory signals. This selective destruction, mitophagy, relies on a surveillance system built from two proteins: PINK1 and Parkin. PINK1 is constantly being made and imported into all of your mitochondria, but in healthy ones it gets rapidly chopped up and cleared. When a mitochondrion loses its membrane charge, a sign that something has gone wrong, PINK1 is no longer degraded. It accumulates on the outer membrane of the damaged organelle, which acts as a “come eat me” flag for Parkin.20PLoS Biology. PINK1 Is Selectively Stabilized on Impaired Mitochondria to Activate Parkin Parkin then tags the mitochondrion for destruction by the cell’s recycling machinery.21PubMed Central. A unified mechanism for mitochondrial damage sensing in PINK1-Parkin-mediated mitophagy
This matters because mutations in PINK1 and Parkin are among the known genetic causes of early-onset Parkinson’s disease, underscoring how critical mitochondrial quality control is for brain health. It also explains why strategies that activate mitophagy, like fasting, exercise, and urolithin A, may be protective against neurodegenerative conditions.
Alongside mitophagy, your mitochondria constantly reshape themselves through fusion and fission. Fusion lets neighboring mitochondria merge, mixing their contents so that a slightly damaged organelle can be rescued by combining with a healthy one. Fission splits mitochondria apart, which is essential for cell division and for isolating severely damaged segments for destruction. A healthy balance between these two processes maintains the size, number, and function of the entire mitochondrial network.22PubMed. Fusion and fission: interlinked processes critical for mitochondrial health When this balance tilts in either direction, problems follow: too much fission leads to fragmented, dysfunctional mitochondria, while too much fusion can mask damage and prevent cleanup. Imbalances in fusion and fission have been linked to cancer, cardiovascular disease, and neurodegeneration.23PubMed Central. Mitochondrial fusion and fission: The fine-tune balance for cellular homeostasis
What Actively Harms Your Mitochondria
While focusing on what builds mitochondria up, it is equally important to know what tears them down. Environmental toxicants and certain medications directly interfere with mitochondrial function. Drugs have been identified that inhibit or uncouple the electron transport chain, block fatty acid oxidation, impair mitochondrial DNA replication, disrupt protein synthesis within mitochondria, and increase production of reactive oxygen species.24Toxicological Sciences. Mitochondria as a Target of Environmental Toxicants Common examples include certain antibiotics, some chemotherapy agents, and specific antiretroviral drugs. Alcohol, heavy metals, pesticides, and air pollution also exert direct mitochondrial toxicity.
This is relevant context for anyone trying to optimize mitochondrial health. You can stack exercise, cold exposure, supplements, and fasting, but if you are simultaneously exposed to significant mitochondrial toxicants, the net gain may be smaller than expected. Reducing avoidable exposures, like excessive alcohol, unnecessary medications with known mitochondrial side effects, and environmental pollutants where practical, is as much a part of the strategy as the active interventions are.
The AMPK-SIRT1-PGC-1α Axis Ties It All Together
What connects exercise, fasting, cold exposure, and NAD+ precursors under one umbrella is that they all feed into the same central signaling cascade. AMPK acts as a cellular fuel gauge: when energy runs low, during a hard workout or a prolonged fast, AMPK activity rises. SIRT1 is an enzyme that depends on NAD+ to function, so anything that raises NAD+ levels, whether through exercise, calorie restriction, or NMN supplementation, increases SIRT1 activity. Both AMPK and SIRT1 converge on PGC-1α, activating it through different chemical modifications, and active PGC-1α then switches on the genes responsible for building new mitochondria.25PubMed Central. PGC-1alpha, SIRT1 and AMPK, an energy sensing network that controls energy expenditure
Understanding this convergence is useful because it explains why stacking strategies can be more effective than relying on any single one. Exercise activates AMPK directly. Fasting also activates AMPK and raises NAD+ levels, stimulating SIRT1. NMN supplementation raises NAD+ through a different route, feeding SIRT1 from the supply side. Cold exposure engages overlapping but distinct metabolic pathways. Each input hits the same hub from a slightly different angle, and there is reason to believe the effects can compound. It also explains why the basics, moving your body regularly, not eating constantly, sleeping enough, and managing stress, have such outsized effects compared to any supplement. They engage the deepest, most evolutionarily conserved energy-sensing machinery your cells have.