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A research-focused comparison of Melanotan II and PT-141, covering melanocortin receptor selectivity, evidence, safety signals and regulatory status.
The ageing of an organism is a progressive, multi-level accumulation of molecular and cellular damage that leads to a gradual loss of tissue function. Contemporary biology organises this process within the framework of the hallmarks of ageing — a set of mechanisms describing why and how we age. This guide presents these mechanisms in a scientific register, without promises or oversimplifications.
This guide is educational in nature and constitutes a review of the published scientific literature on the biology of ageing. It is not medical or dietary advice, nor a set of recommendations. It describes the molecular and cellular mechanisms studied in the context of ageing — not methods for “extending” or “reversing” ageing, which science does not confirm in that form. The substances mentioned in the text are research reagents, not products intended for use.
In everyday understanding, ageing is simply the passage of time. In biology it is a more precise concept: a functional decline resulting from the accumulation of damage at the level of molecules, cells and tissues. There is no single “cause” of ageing and no single switch — it is a multifactorial process in which many interrelated changes occur in parallel.
An important shift in perspective brought about by the last two decades of research is that ageing is no longer treated as passive “wear and tear”. It turned out that at its foundation lie specific, reproducible molecular mechanisms — consistent enough across organisms to be catalogued. These are the subject of geroscience: the field that studies the biology of ageing as a process rather than an inevitable fact.
It is worth noting the interpretive frame from the outset. Describing a mechanism of ageing is not the same as being able to halt or reverse it. Most of this knowledge comes from animal models and cell studies; its translation to human physiology remains open on many points. This guide describes what is known about the mechanisms, not what supposedly follows from that for practice.
Historically, two families of explanation competed. “Programme” theories assumed that ageing is to some degree written into the genes — a controlled developmental process. “Damage” theories saw it as the accumulation of random errors: damage to DNA, proteins and organelles whose repair fails to keep pace over time. The contemporary picture combines both views: ageing results from the accumulation of damage, but the rate of that accumulation and the response to it are regulated by specific genetic and metabolic pathways — the same ones described by the hallmarks of ageing. The classical concept of antagonistic pleiotropy adds an important thread here: genes beneficial in early life (for example, favouring growth and reproduction) may in later age contribute to the processes of ageing — evolution “optimises” the organism for reproduction, not longevity.
The breakthrough that organised the entire field was the publication by López-Otín et al. (2013, Cell), which distinguished a set of hallmarks of ageing — mechanisms meeting three criteria: they appear with age, their intensification accelerates ageing, and their attenuation in models slows it. Nine hallmarks were originally described; the 2023 update expanded the list to twelve.
The hallmarks are usually grouped into three tiers:
The value of this framework lies in the fact that it presents ageing as a network of interconnected processes rather than a single defect. Mitochondrial dysfunction is linked to NAD+ metabolism; telomere shortening to senescence; nutrient sensing to the sirtuin and mTOR pathways. This is why the individual mechanisms are best understood in relation to the whole.
A few of them are worth outlining, as they recur in the further articles:
None of these hallmarks acts in isolation — and it is precisely this interdependence that makes the biology of ageing a field requiring a holistic approach.
Below are the most frequently studied mechanisms, each developed in a separate article in a strictly scientific register.
The peptides and compounds studied in the context of these mechanisms — MOTS-c, Epithalon, NMN, 5-amino-1MQ — are described in dedicated articles, always within the frame of a research reagent (Research Use Only), not a product with a rejuvenating effect.
At the foundation of geroscience lies a specific working hypothesis: if ageing is a common risk factor for many age-related diseases — cardiovascular, metabolic, neurodegenerative — then studying its mechanisms may be more fruitful in terms of understanding than dealing with each disease separately. On this view, the hallmarks of ageing are not biological curiosities but potential common points of many disease processes.
This assumption explains why such diverse directions — NAD+ metabolism, mitochondrial function, telomeres, autophagy — are analysed within a single framework. This is not about a “cure for old age” but about understanding the network of mechanisms underlying age-related functional decline. The practical translation of this knowledge remains the subject of research; the framework itself, however, has organising value — including for the reader who wants to distinguish science from longevity marketing.
It is worth remembering the scale of the evidence here. A significant portion of the promising results comes from short-lived model organisms — yeast, nematodes, fruit flies, mice — in which the effect on lifespan is easier to observe. Transferring such observations to humans is difficult and slow, in part because the length of human life makes direct studies of longevity exceptionally demanding methodologically. Interpretive caution is therefore not a formality but a consequence of the actual state of knowledge.
The public space around “longevity” is divided between two poles, neither of which corresponds to the scientific register. On one side — lifestyle biohacking promising the “activation” of mechanisms through specific practices. On the other — the marketing of “anti-ageing products”. It is worth separating what follows from research from what is an oversimplification.
A mechanism is not an intervention. The fact that a given pathway (for example, autophagy or sirtuins) participates in the biology of ageing does not mean that there is a confirmed method of favourably modifying it in humans. Many circulating “protocols” rest on extrapolation from animal models or cell studies — a scientific direction, not a ready recipe.
“Slowing” is not “reversal”. Geroscience research analyses what affects the rate of the processes of ageing in models. There is no confirmed method of “reversing” ageing or “extending life” in humans in the sense in which marketing uses the term. Caution in wording is here a part of integrity.
A studied substance is not a rejuvenating supplement. The compounds analysed in the context of ageing mechanisms (mitochondrial peptides, NAD+ precursors, bioregulators) are described in this knowledge base as research reagents with a defined mechanism — not as products with a promised effect on the length or quality of life.
This positioning — a sound mechanism instead of a promise — is the frame within which all the longevity articles in the One-Peptides knowledge base are created.
A few questions help distinguish science from oversimplification for any claim about “longevity”:
These four distinctions are the axis around which the entire longevity section of this knowledge base is built — and a good filter for content encountered elsewhere.
The articles below develop the individual mechanisms. Each describes what follows from research — not what to do.
The research substances linked to these directions — MOTS-c, NMN, Epithalon, 5-amino-1MQ — have their own articles and product pages with Research Use Only status.
This guide serves an overarching role: it organises the mechanisms to which the individual articles and substance pages refer. Many of these mechanisms, moreover, intersect with energy metabolism — which is why a natural complement to this map is the guide on how metabolism works, describing the same pathways (mitochondria, nutrient sensing) from the perspective of the energy balance rather than ageing.
Why do we age — is there a single cause?
No. Ageing is a multifactorial process in which many interrelated molecular and cellular changes occur in parallel. Biology organises them into the set of hallmarks of ageing — from genomic instability and telomere shortening to mitochondrial dysfunction and cellular senescence.
What are the hallmarks of ageing?
They are a set of molecular and cellular mechanisms describing the biology of ageing, distinguished in the work of López-Otín et al. (2013, expanded in 2023). Each hallmark appears with age and participates in the process of ageing. This framework presents ageing as a network of interconnected processes, not a single defect.
Can ageing be halted or reversed?
There is no method confirmed in humans of “halting” or “reversing” ageing. Geroscience research analyses mechanisms and their modification mainly in animal and cell models. Describing a mechanism is not the same as the existence of an effective intervention — this distinction is the basis of a sound treatment of the subject.
What is biological age?
It is a concept describing the “biological wear” of an organism, distinguished from chronological age. It is studied using biomarkers such as telomere length and epigenetic clocks (patterns of DNA methylation). These are research and diagnostic tools, not interventions.
Do peptides and supplements rejuvenate?
The compounds studied in the context of ageing mechanisms are described in this knowledge base as research reagents with a defined molecular mechanism, not as products with a rejuvenating effect. We make no claims about “rejuvenation” or “extending life” — this is a scientific register, not a marketing one.
What is inflammaging?
It is the term for the chronic, low-grade inflammation that builds up with age. It is associated with factors secreted by senescent cells and with altered intercellular communication, and is one of the integrative hallmarks of ageing — connecting local cellular changes with systemic consequences. This is a description of a scientifically studied phenomenon, not a condition to be self-treated.
Why are results from animal studies difficult to transfer to humans?
A significant portion of the promising observations on longevity comes from short-lived organisms (yeast, nematodes, flies, mice), in which the effect on lifespan is easy to measure. In humans such studies are exceptionally demanding methodologically — in part because of lifespan. This is why a mechanism confirmed in a model does not automatically translate into a confirmed intervention in humans.
This content is educational in nature only and constitutes a review of the published scientific literature on the biology of ageing. It does not constitute medical or dietary advice, nor a set of recommendations; it does not serve to diagnose, treat or prevent. The mechanisms described relate for the most part to animal and cell models — their translation to human physiology remains the subject of research. The text does not refer to “extending” or “rejuvenating” life, which science does not confirm in that form. The substances mentioned in the guide (MOTS-c, NMN, Epithalon, 5-amino-1MQ and others) are chemical reagents with Research Use Only status — not medicines, not supplements with a rejuvenating effect, not products for consumption with the aim of influencing ageing. Health-related decisions should be discussed with a physician.
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