Quick Answer: What Does Mitochondrial Stress Have to Do With Aging?
Aging is not caused by a single biological defect. It is a progressive loss of cellular resilience involving interconnected processes such as mitochondrial dysfunction, altered nutrient sensing, impaired proteostasis, cellular senescence, chronic inflammation and genomic instability.

Mitochondria are particularly important because they are both energy-producing organelles and signaling platforms. When mitochondrial function is disturbed, cells do not simply experience less ATP production. They also encounter changes in redox balance, reactive oxygen species, mitochondrial quality control and stress signaling.
This is where MOTS-c becomes scientifically interesting. MOTS-c is a 16-amino-acid peptide encoded by mitochondrial DNA. Research suggests that it participates in stress adaptation and mitochondria-to-nucleus signaling, with proposed effects on energy homeostasis, AMPK signaling and aging-related processes.
The important distinction is that MOTS-c is an aging-research molecule, not an established anti-aging treatment. Much of the evidence remains preclinical or observational.
Key Takeaways
- Mitochondrial dysfunction is strongly associated with biological aging and age-related decline.
- Aging can impair mitochondrial quality control, redox balance, mitochondrial dynamics and oxidative capacity.
- Mitochondrial stress is not necessarily synonymous with mitochondrial damage; controlled stress can activate adaptive responses.
- MOTS-c is a mitochondrial-derived peptide encoded within the mitochondrial 12S rRNA region.
- Research suggests MOTS-c responds to metabolic stress and can translocate to the nucleus, linking mitochondrial status with nuclear gene regulation.
- AMPK is one of the major signaling pathways associated with MOTS-c and cellular energy homeostasis.
- Human observational research shows that circulating MOTS-c and skeletal-muscle MOTS-c can behave differently with age, so “MOTS-c declines with age” is an oversimplification.
- Experimental studies suggest MOTS-c can influence mitochondrial homeostasis, cellular stress responses and aging-related phenotypes.
- Longevity research should distinguish healthy aging biology from claims of lifespan extension or rejuvenation.
Introduction: Why Mitochondria Matter in the Biology of Aging
Longevity research has moved far beyond the idea that aging is simply accumulated “wear and tear.”
Modern aging biology examines a network of processes that gradually reduce the ability of cells and tissues to maintain homeostasis.
Mitochondria sit near the center of this network.
They generate most cellular ATP through oxidative phosphorylation, regulate redox balance, participate in apoptosis, communicate with the nucleus and respond to changes in nutrient availability and cellular stress.
As organisms age, mitochondrial quality and activity can decline. At the same time, mitochondrial quality-control systems such as mitophagy, mitochondrial dynamics and stress-response pathways can become dysregulated.
The result is not simply an “energy shortage.”
It is a change in how cells sense and respond to stress.
That distinction is essential for understanding why mitochondrial-derived peptides such as MOTS-c have become interesting in aging research.
Mitochondrial Dysfunction Is More Than Low Energy
A simplified description of mitochondria is that they are the cell’s “power plants.” That analogy is useful, but incomplete.
Mitochondria also act as signaling hubs.
Changes in mitochondrial membrane potential, electron transport, reactive oxygen species, metabolites and mitochondrial DNA integrity can influence nuclear gene expression and cellular stress responses.
Therefore, mitochondrial dysfunction can affect several biological systems simultaneously.
| Mitochondrial Function | What Can Change With Aging? | Potential Aging Relevance |
|---|---|---|
| Oxidative phosphorylation | Reduced or altered respiratory capacity | Energy production and tissue function |
| Redox control | Altered ROS generation and antioxidant responses | Oxidative stress and cellular signaling |
| Mitophagy | Potential impairment of damaged-mitochondria clearance | Accumulation of dysfunctional mitochondria |
| Mitochondrial dynamics | Changes in fusion and fission balance | Mitochondrial quality and stress adaptation |
| Mitochondrial signaling | Altered communication with the nucleus and cytoplasm | Cellular adaptation and senescence |
Reviews of mitochondrial dysfunction in aging emphasize that mitochondrial quality control is particularly important. Excessive or insufficient activation of mitochondrial quality-control pathways can both become problematic, potentially contributing to abnormal metabolism and cellular senescence.
The Aging Mitochondrion Exists in a Changing Stress Environment
One of the more interesting developments in aging biology is the recognition that mitochondrial stress is not automatically harmful.
Cells have evolved signaling systems that detect mitochondrial perturbation and attempt to restore homeostasis.
These include mitochondrial unfolded protein responses, mitophagy, changes in mitochondrial dynamics, redox signaling and metabolic reprogramming.
When these adaptive systems work effectively, a temporary disturbance can trigger beneficial adaptation.
When mitochondrial damage becomes excessive or quality-control systems become dysfunctional, the same stress signals can contribute to persistent dysfunction.
This concept is closely related to mitohormesis: the idea that certain forms of mitochondrial stress can activate adaptive responses that increase cellular resilience.
This does not mean that more mitochondrial stress is better. It means that the biological response to stress matters.
Where MOTS-c Fits Into Mitochondrial Stress Signaling
MOTS-c stands for mitochondrial open reading frame of the 12S rRNA-c.
Unlike conventional nuclear-encoded peptides, MOTS-c is encoded by a short open reading frame within mitochondrial DNA, specifically the mitochondrial 12S rRNA region.
That origin is biologically significant.
The peptide provides a potential communication route between mitochondrial state and broader cellular regulation.
Research indicates that under metabolic stress, MOTS-c can translocate to the nucleus and regulate stress-adaptation-related genes. The peptide has also been studied in relation to the folate-AICAR-AMPK pathway, energy metabolism and inflammatory responses.
This makes MOTS-c part of a larger research concept:
The key research question is whether MOTS-c helps cells interpret mitochondrial and metabolic stress in a way that supports homeostasis.
MOTS-c and the Stress-Homeostasis Connection
A 2023 review of MOTS-c describes the peptide as a stress-responsive mitochondrial-derived signal involved in energy metabolism, stress homeostasis, inflammation, exercise and aging-related processes.
The proposed mechanism is particularly interesting because MOTS-c is not confined to one metabolic pathway.
Under stress conditions, the peptide can move toward the nucleus and influence expression of genes associated with cellular adaptation.
At the same time, its metabolic signaling has been connected with AMPK.
AMPK acts as a cellular energy sensor and coordinates responses to changes in energy availability. This creates a conceptual bridge between mitochondrial stress and broader cellular metabolism.
MOTS-c sits at an unusual intersection between mitochondrial biology and cellular signaling. It is not merely a peptide “made by mitochondria.” Its research significance comes from the possibility that mitochondria can generate a signal that changes how the nucleus and the rest of the cell respond to metabolic stress.
What Changes in Mitochondria During Aging?
Mitochondrial aging is multifactorial.
Researchers have described changes involving respiratory capacity, mitochondrial DNA, ROS production, membrane potential, fusion and fission, mitophagy and mitochondrial biogenesis.
These processes are interconnected.
For example, damaged mitochondria can generate altered redox signals. If mitochondrial quality-control mechanisms fail to remove or repair those mitochondria, dysfunctional organelles can accumulate.
Persistent mitochondrial dysfunction can then contribute to cellular stress and senescence.
This creates a potential feedback loop:
↓
Altered redox + metabolic signaling
↓
Stress-response activation
↓
Impaired cellular homeostasis
↓
Senescence / tissue dysfunction
↓
Further loss of mitochondrial resilience
This is one reason mitochondrial dysfunction is increasingly studied as an interacting component of the biology of aging rather than as an isolated cause.
Mitochondria, Cellular Senescence and Aging
Cellular senescence is another important connection.
Senescent cells stop proliferating and develop a characteristic secretory phenotype that can influence neighboring cells and tissue environments.
Mitochondrial dysfunction and cellular senescence are closely interconnected.
Research reviews describe mitochondrial dysfunction as both a cause and consequence of cellular senescence, creating feedback loops involving altered respiratory capacity, membrane potential and reactive oxygen species.
This does not mean every dysfunctional mitochondrion produces a senescent cell. Rather, mitochondrial stress is one component of a broader network that can influence whether cells maintain function or enter a persistent stress state.
Mitochondrial-derived peptides have therefore become interesting to aging researchers because they may participate in communication between mitochondrial status and cellular homeostasis.
MOTS-c and Aging: What the Research Actually Shows
The relationship between MOTS-c and aging is more nuanced than a simple “MOTS-c falls with age” statement.
A 2022 review reported that MOTS-c is present in plasma and that levels decline with age, while discussing potential roles in age-related disease and mitochondrial metabolic balance.
However, human skeletal-muscle research provides a more complicated picture.
In a study of healthy aging men, circulating MOTS-c decreased with age, but skeletal-muscle MOTS-c expression was approximately 1.5-fold higher in older men aged 70–81 compared with young men aged 18–30.
The authors concluded that circulating and muscle MOTS-c appear to be differentially regulated with aging.
This distinction is important.
| MOTS-c Measurement | Observed Aging Pattern | Why It Matters |
|---|---|---|
| Circulating MOTS-c | Reduced with age in several reports | May reflect altered systemic signaling |
| Skeletal-muscle MOTS-c | Higher in older versus young healthy men in one study | Suggests tissue-specific regulation |
| MOTS-c in aged cell models | Experimental treatment can alter homeostasis-related pathways | Provides mechanistic clues, not clinical proof |
For longevity research, this is a valuable lesson: a biomarker’s concentration in blood is not necessarily equivalent to its activity inside a specific tissue.
MOTS-c in Aged Human Cells
One particularly relevant experiment examined aged human placenta-derived mesenchymal stem cells in vitro.
Researchers found that MOTS-c treatment affected cellular morphology, activated AMPK and inhibited its antagonistic effector mTORC1.
They also reported changes in mitochondrial homeostasis, including decreased oxygen consumption and reactive oxygen species production. After treatment, mitochondrial characteristics of old cells became more similar to those observed in young cells in several measurements.
These findings are intriguing because they directly connect MOTS-c with cellular aging and mitochondrial homeostasis.
But the experimental context matters.
This was an in-vitro cell study, not a clinical longevity trial.
It tells researchers that MOTS-c can influence aging-related cellular biology under controlled experimental conditions. It does not demonstrate that MOTS-c reverses human aging.
When an experimental study reports that an aged cell population becomes more similar to a younger state in selected mitochondrial measurements, that is mechanistically interesting. It should not be translated into a claim that the compound rejuvenates an entire human organism or extends human lifespan.
MOTS-c and Mitochondrial Dynamics
Mitochondria are not static structures.
They constantly undergo fusion and fission, allowing cells to reorganize mitochondrial networks in response to energetic and stress conditions.
Healthy mitochondrial dynamics help cells isolate damaged components, redistribute mitochondrial contents and adapt to changing energy requirements.
Experimental research using D-galactose-induced aging models reported that MOTS-c treatment was associated with changes in mitochondrial dynamics, including alterations in Drp1 and mitofusin-related pathways.
The study also reported changes in age-associated tissue phenotypes and markers of DNA stress.
Again, this is preclinical evidence.
Its importance lies in the mechanistic hypothesis: MOTS-c may influence aging phenotypes partly through pathways that regulate mitochondrial organization and homeostasis.
MOTS-c and Mitochondrial Stress: The Concept of Mitohormesis
One of the most interesting ideas for understanding MOTS-c is mitohormesis.
Mitohormesis describes situations in which a temporary perturbation of mitochondrial function activates adaptive responses that can make cells more resilient.
Exercise is a classic example of a physiological stressor that stimulates adaptation rather than simply causing damage.
But the relationship is dose- and context-dependent.
Too little stress may provide little adaptive stimulus. Excessive or persistent stress can overwhelm cellular defenses.
For MOTS-c research, this raises an important question:
Is MOTS-c part of the adaptive signaling response that helps cells translate mitochondrial stress into improved homeostasis?
Current literature provides mechanistic reasons to investigate that hypothesis, but not enough human evidence to establish it as a longevity intervention.
Why AMPK Keeps Appearing in MOTS-c and Aging Research
AMPK is one of the recurring molecular pathways in MOTS-c research.
It is activated when cells experience changes in energy status and coordinates multiple processes that help restore energetic balance.
Research on MOTS-c has connected the peptide to the folate-AICAR-AMPK pathway, while aged-cell experiments have also demonstrated AMPK activation following MOTS-c treatment.
AMPK is relevant to aging because nutrient sensing and energy regulation are deeply connected to cellular maintenance.
However, AMPK should not be treated as a simple “longevity switch.”
It operates within a larger network involving mTOR, mitochondrial biogenesis, autophagy, nutrient availability, exercise and cellular stress.
This network-level view is much closer to modern geroscience.
MOTS-c, mTOR and Cellular Homeostasis
The relationship between AMPK and mTOR is particularly relevant.
AMPK generally signals energetic stress and can oppose some anabolic processes promoted by mTORC1.
In aged human mesenchymal stem cells, MOTS-c treatment was reported to activate AMPK while inhibiting mTORC1 signaling.
This finding is interesting because nutrient-sensing pathways are closely connected to cellular maintenance and aging biology.
But again, the experimental system matters.
A molecular change in cultured cells does not establish that the same pathway produces clinically meaningful changes in an aging human.
The Longevity Question: Biomarker, Mechanism or Treatment?
MOTS-c occupies several different roles in the scientific literature, and confusing them can create exaggerated claims.
| Research Role | What the Evidence Can Tell Us | What It Cannot Yet Prove |
|---|---|---|
| Biomarker | MOTS-c levels may vary with age and metabolic state | That changing MOTS-c alone causes aging |
| Mechanistic signal | MOTS-c can participate in stress and metabolic signaling | That manipulating it will improve human longevity |
| Preclinical intervention | Animal and cell models can reveal biological effects | Human lifespan extension or rejuvenation |
| Research peptide | Provides a tool for experimental investigation | Clinical efficacy or safety outside appropriate trials |
Why Da Lat Is a Useful Longevity Lens
Da Lat provides a different context for discussing peptide research than a high-intensity sports environment.
The city’s cooler climate, slower pace and wellness-oriented lifestyle naturally lend themselves to conversations about long-term health, healthy aging and sustainable routines.
For longevity-focused expatriates and long-stay residents, mitochondrial aging can be understood through the idea of preserving cellular resilience rather than chasing rapid transformation.
That distinction matters.
Healthy aging research is increasingly concerned with maintaining functional capacity: muscle quality, metabolic health, cognitive function, mitochondrial resilience and the ability to recover from physiological stress.
MOTS-c research fits into this framework because its proposed biology concerns cellular adaptation and homeostasis.
But it should remain a research question, not a shortcut around foundational longevity behaviors.
Slow Living Does Not Mean Biological Inactivity
A slower lifestyle can still contain substantial metabolic and mitochondrial stimulation.
Walking, hiking, resistance exercise, cycling, adequate sleep and nutritional stability all create changing physiological demands.
The mitochondrial system responds continuously to these inputs.
For longevity science, the goal is not to eliminate every form of cellular stress. Instead, it is to understand how cells manage stress and maintain homeostasis over decades.
This is precisely why mitochondrial stress signaling is such an important aging research topic.
MOTS-c Is Not a Substitute for Mitochondrial Adaptation Through Lifestyle
Exercise remains one of the strongest physiological stimuli for mitochondrial adaptation.
Physical activity can influence mitochondrial biogenesis, respiratory capacity, substrate utilization, redox signaling and quality-control systems.
Nutrition, sleep and metabolic health also influence mitochondrial function.
Therefore, research into MOTS-c should not be interpreted as evidence that a peptide can replace these physiological signals.
Instead, MOTS-c may help researchers understand how mitochondria communicate the presence of metabolic stress to the rest of the cell.
That is already a scientifically important question.
What the Current Evidence Supports
| Question | Current Interpretation |
|---|---|
| Is mitochondrial dysfunction associated with aging? | Yes. Extensive literature supports mitochondrial dysfunction as an important component of aging biology. |
| Does mitochondrial stress activate adaptive signaling? | Yes. Mitochondrial stress responses can activate cellular mechanisms intended to restore homeostasis. |
| Is MOTS-c involved in stress signaling? | Strong preclinical support. MOTS-c is associated with metabolic stress, nuclear signaling and AMPK-related pathways. |
| Does MOTS-c change with aging? | Yes, but the pattern is tissue-specific. Circulating and skeletal-muscle MOTS-c do not necessarily change in the same direction. |
| Does MOTS-c reverse human aging? | Not established. Current evidence is predominantly mechanistic, cellular, animal and observational. |
| Does an MOTS-c injection pen prove longevity benefits? | No. Delivery format does not establish biological efficacy or clinical outcomes. |
Frequently Asked Questions
Mitochondrial dysfunction refers to impaired or altered mitochondrial performance, including changes in oxidative phosphorylation, membrane potential, redox balance, mitochondrial dynamics or quality-control processes.
Mitochondrial dysfunction can affect cellular energy production, redox signaling, quality control and stress responses. These processes interact with other aging mechanisms and may contribute to progressive loss of cellular resilience.
Mitochondrial stress occurs when mitochondria experience disturbances that activate cellular stress-response pathways. Depending on intensity and duration, these responses can support adaptation or contribute to dysfunction.
Mitohormesis describes adaptive cellular responses triggered by certain forms of mitochondrial stress. The concept helps explain why some physiological stressors can promote resilience rather than simply cause damage.
MOTS-c is a 16-amino-acid mitochondrial-derived peptide encoded by a short open reading frame within the mitochondrial 12S rRNA region.
Experimental research suggests that MOTS-c responds to metabolic stress and can translocate to the nucleus, where it participates in regulation of stress-adaptation-related genes. AMPK-related signaling is another major proposed mechanism.
Circulating MOTS-c has been reported to decline with age, but human skeletal-muscle data are more complex. One study found higher skeletal-muscle MOTS-c expression in older men despite lower circulating levels, suggesting tissue-specific regulation.
Preclinical studies suggest MOTS-c can influence mitochondrial homeostasis and aging-related phenotypes in cells and animals. This does not establish reversal of mitochondrial aging in humans.
In aged human placenta-derived mesenchymal stem cells cultured in vitro, MOTS-c affected AMPK/mTORC1 signaling and mitochondrial homeostasis, including changes in oxygen consumption and reactive oxygen species. These findings are mechanistic and preclinical.
No established clinical classification supports that claim. MOTS-c is an investigational mitochondrial-derived peptide being studied for metabolic, stress-response and aging-related biology.
Yes. AMPK is one of the major signaling pathways associated with MOTS-c research. Experimental work has connected MOTS-c with the folate-AICAR-AMPK pathway and with AMPK activation in aged cells.
Mitochondria influence energy metabolism, redox signaling, quality control and communication with the nucleus. Maintaining mitochondrial homeostasis is therefore considered an important component of healthy aging biology.
No. An injection pen describes a delivery format. It does not demonstrate that MOTS-c extends lifespan, reverses aging or improves human longevity outcomes.
Da Lat’s slower, wellness-oriented lifestyle provides a natural context for discussing long-term health, mitochondrial resilience and healthy aging rather than short-term transformation or performance enhancement.
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Related Research Products
Premium MOTS-C 20mg Injection Pen
A research-oriented MOTS-c injection-pen format relevant to experimental investigations of mitochondrial-derived peptide signaling, metabolic stress and cellular homeostasis. The product format itself is not evidence of clinical longevity efficacy.
MOTS-C 20mg Research Peptide
A conventional research format for laboratory investigation of MOTS-c biology, mitochondrial signaling, metabolic stress and cellular homeostasis.
Longevity Peptide Plan
Readers exploring the broader research landscape around mitochondrial signaling, healthy aging and longevity biology can review the Longevity Peptide Plan. This resource is intended for educational and research-planning purposes rather than individualized medical treatment.
Scientific References
- Guo Y, Guan T, Shafiq K, et al. Mitochondrial dysfunction in aging. Ageing Res Rev. 2023;88:101955. PMID: 37196864. DOI: 10.1016/j.arr.2023.101955.
- Sun N, Youle RJ, Finkel T. The Mitochondrial Basis of Aging. Mol Cell. 2016;61(5):654-666. PMID: 26942670. DOI: 10.1016/j.molcel.2016.01.028.
- Finkel T, Holbrook NJ. Oxidants, oxidative stress and the biology of ageing. Nature. 2000;408:239-247. PMID: 11089981. DOI: 10.1038/35041687.
- Finkel T. Mitohormesis: mitochondrial stress responses and healthy aging. Cell Metab. 2023. PMID: 37939657. DOI: 10.1016/j.cmet.2023.10.011.
- Lee C, Zeng J, Drew BG, et al. The mitochondrial-derived peptide MOTS-c promotes metabolic homeostasis and reduces obesity and insulin resistance. Cell Metab. 2015;21(3):443-454. PMID: 25738459. DOI: 10.1016/j.cmet.2015.02.009.
- Wan W, Zhang L, Lin Y, et al. Mitochondria-derived peptide MOTS-c: effects and mechanisms related to stress, metabolism and aging. J Transl Med. 2023;21:36. PMID: 36670507. DOI: 10.1186/s12967-023-03885-2.
- Mohtashami Z, Singh MK, Salimiaghdam N, Ozgul M, Kenney MC. MOTS-c, the Most Recent Mitochondrial Derived Peptide in Human Aging and Age-Related Diseases. Int J Mol Sci. 2022;23(19):11991. PMID: 36233287. DOI: 10.3390/ijms231911991.
- Lee C, et al. Mitochondrial-derived peptides in aging and age-related diseases. Geroscience. 2020. PMID: 32910336. DOI: 10.1007/s11357-020-00262-5.
- Yu WD, Kim YJ, Cho MJ, et al. The mitochondrial-derived peptide MOTS-c promotes homeostasis in aged human placenta-derived mesenchymal stem cells in vitro. Mitochondrion. 2021;58:135-146. PMID: 33639272. DOI: 10.1016/j.mito.2021.02.010.
- Kim SJ, Mehta HH, Wan J, et al. Mitochondrial peptides modulate mitochondrial function during cellular senescence. Aging. 2018;10(6):1239-1256. PMID: 29886458. DOI: 10.18632/aging.101463.
- Kim C, et al. Increased expression of the mitochondrial derived peptide, MOTS-c, in skeletal muscle of healthy aging men is associated with myofiber composition. Aging. 2020;12:124-139. PMID: 32182209. DOI: 10.18632/aging.102944.
- Li Y, et al. Earlier changes in mice after D-galactose treatment were improved by mitochondria derived small peptide MOTS-c. Aging. 2019. PMID: 30967270.
- Fuku N, Pareja-Galeano H, Zempo H, et al. The mitochondrial-derived peptide MOTS-c: a player in exceptional longevity? Aging Cell. 2015;14(6):921-923. PMID: 26289118. DOI: 10.1111/acel.12389.
- Guo Y, et al. Interactions between mitochondrial dysfunction and other hallmarks of aging: Paving a path toward interventions that promote healthy old age. Ageing Res Rev. 2023. PMID: 37497653.
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Conclusion
Mitochondrial dysfunction is one of the most important biological themes in modern aging research because mitochondria influence far more than ATP production.
They regulate redox balance, stress signaling, quality control, mitochondrial dynamics and communication with the nucleus. When these systems become less resilient, mitochondrial dysfunction can interact with cellular senescence, inflammation and other aging mechanisms.
MOTS-c is particularly interesting because it represents a direct connection between mitochondrial genetics and cellular signaling. The peptide is encoded within mitochondrial DNA and appears to respond to metabolic stress, with research linking it to AMPK, nuclear stress-response signaling and mitochondrial homeostasis.
The aging evidence is also more nuanced than a simple decline in MOTS-c. Circulating MOTS-c has been reported to decrease with age, while skeletal-muscle expression may increase in healthy older men. This suggests that aging changes MOTS-c biology in a tissue-specific manner rather than simply switching the peptide “off.”
Experimental work in aged human cells and animal models provides further reasons to investigate MOTS-c, particularly its potential effects on mitochondrial homeostasis, oxidative stress, mitochondrial dynamics and cellular aging phenotypes.
But the distinction between interesting geroscience and proven longevity intervention must remain clear.
For longevity-oriented communities in Da Lat, that distinction is especially valuable. Slow living is not about eliminating physiological stress. It is about building a lifestyle in which the body repeatedly encounters manageable challenges and has sufficient resources to recover and maintain homeostasis.
That is also the deeper question behind MOTS-c research: how does a mitochondrion communicate that it is under stress, and how does the rest of the cell respond?
Quick Answer
Core Questions: What does mitochondrial dysfunction have to do with aging? What is mitochondrial stress? How does MOTS-c respond to cellular stress? Does MOTS-c decline with age? What is the relationship between MOTS-c and AMPK? Can MOTS-c affect mitochondrial homeostasis? Is MOTS-c an anti-aging peptide?
Evidence Level: Mitochondrial dysfunction is strongly supported as an important component of aging biology; MOTS-c mechanisms are supported mainly by cellular, animal and observational human research; human longevity benefits from exogenous MOTS-c remain unestablished.
