MOTS-c vs NAD+: two very different molecules in metabolism research
Prepared by: Research Desk. Sources are linked for verification.
MOTS-c and NAD+ often turn up in the same online conversations about mitochondria, metabolism and ageing. That can make them sound like two versions of the same thing. They are not. One is a short peptide that scientists discovered only about a decade ago. The other is a small molecule that biochemists have studied for more than a century and that every living cell relies on.
This explainer puts them side by side in plain English: what each one is, where it comes from, what kinds of studies have looked at it, and what is still unknown. It is a research overview only. For the basics of MOTS-c on its own, start with our beginner's guide to MOTS-c.
The short version
MOTS-c | NAD+ | |
|---|---|---|
What kind of molecule? | A peptide (a short chain of 16 amino acids) [1] | A coenzyme (a small helper molecule for enzymes) [3] |
Where is it made? | From instructions in mitochondrial DNA [1] | Built inside cells through several metabolic pathways [3][5] |
Main research role | Studied as a possible signalling molecule between mitochondria, the nucleus and other tissues [1][2] | Studied as a core part of energy metabolism and many enzyme reactions [3][4] |
How long has it been studied? | Described in 2015 [1] | Studied for decades; still an active research field [5][6] |
Main evidence base | Mostly cell and mouse studies, with some human measurements [7][8] | A large body of cell, animal and human research, summarised in major reviews [3][4][6] |
What is MOTS-c?
MOTS-c is a mitochondrial-derived peptide. Mitochondria carry their own small set of DNA, and in 2015 a team led by Changhan Lee reported that a short stretch inside the mitochondrial 12S rRNA gene contains instructions for a 16-amino-acid peptide [1]. They named it MOTS-c.
In that 2015 paper, which combined cell experiments and mouse experiments, the researchers reported that MOTS-c acted mainly on skeletal muscle. They described effects on the folate cycle and on a cellular energy sensor called AMPK. In mice fed a high-fat diet, giving MOTS-c was reported to reduce diet-induced weight gain and insulin resistance [1]. These were animal findings, not results in people.
A 2018 follow-up study, again in cells and mice, reported something unusual: under metabolic stress, MOTS-c moved from the cell's cytoplasm into the nucleus, where it appeared to influence the activity of nuclear genes, including genes involved in stress responses [2]. That is why some researchers describe MOTS-c as a possible "messenger" between mitochondria and the rest of the cell.
Reviews from 2023 summarise the growing MOTS-c literature on stress, metabolism and ageing, while noting that much of the evidence still comes from laboratory and animal work [8][9].
What is NAD+?
NAD+ stands for nicotinamide adenine dinucleotide. It is not a peptide and is not encoded by any gene. It is a small molecule, a coenzyme, that many enzymes need to do their jobs [3].
Its best-known job is in energy metabolism. NAD+ and its partner form, NADH, shuttle electrons in the chemical reactions that turn nutrients into usable energy, including reactions inside mitochondria [3][4]. NAD+ is also used up by other families of enzymes, such as sirtuins and PARPs, which are involved in processes like DNA repair and gene regulation [3][5].
Cells make NAD+ through several routes. Major reviews describe production from the amino acid tryptophan and from forms of vitamin B3, as well as recycling pathways that rebuild NAD+ after it is used [3][5][6].
A recurring theme in NAD+ research is ageing. Reviews report that NAD+ levels decline with age in a range of tissues and model organisms, and researchers are studying how that decline relates to metabolism and neurodegeneration [3][4]. A 2021 review also looked at links between NAD+ metabolism and diseases that affect movement and motor function [15]. A 2024 review in Nature Reviews Molecular Cell Biology stresses that NAD+ metabolism is tightly regulated and that changing it deliberately is more complicated than early enthusiasm suggested [6].
The key differences, one by one
1. Peptide vs coenzyme
MOTS-c is made of amino acids, like a very small protein [1]. NAD+ is built from nucleotide-like parts and is a cofactor for enzymes [3]. They belong to different chemical families and are made by completely different machinery.
2. Genetic instructions vs metabolic pathways
MOTS-c exists because of a specific sequence in mitochondrial DNA [1]. NAD+ has no gene of its own. It is assembled and recycled by a network of enzymes, and its level depends on how fast it is made versus how fast it is consumed [5][6].
3. Signal vs fuel-handling helper
Researchers mostly study MOTS-c as a signal: something that may tell cells and tissues about metabolic conditions [1][2]. NAD+ is mostly studied as a working part of metabolism itself, needed for hundreds of reactions [3][4]. The two roles overlap in the broad area of "cellular energy", which is one reason they get mentioned together.
4. Very different amounts of evidence
NAD+ biology rests on a deep, decades-long foundation, summarised in multiple major reviews [3][4][5][6]. MOTS-c research is about ten years old and still heavily based on cells and mice [8][9]. A newer field is not automatically wrong, but it has had far less time for findings to be repeated and tested in people. Our page on what we know and don't know about MOTS-c goes into this in more detail.
Where exercise fits in
Exercise research is one place where MOTS-c has some human data. A 2021 study in Nature Communications reported that MOTS-c levels rose in human skeletal muscle and in the bloodstream in response to exercise. The same paper reported that giving MOTS-c to older mice was associated with better physical performance in those animals [7]. The human part measured levels; it did not test MOTS-c as an intervention.
A 2025 study reported that endurance training increased skeletal muscle mitochondrial respiration and linked this to MOTS-c secretion [10]. A 2026 systematic review pulled together studies on mitochondrial-derived peptides, including MOTS-c, that respond to physical exercise [11]. Together these papers explain why MOTS-c is often described as "exercise-related". They do not show that MOTS-c can stand in for exercise.
NAD+ research also connects to exercise and energy use through its central role in metabolism [3][4], but the sources here do not show the two molecules acting together during exercise.
Regulatory status: why the comparison matters
This is where the two molecules diverge sharply in practical terms. MOTS-c is investigational. No MOTS-c product is approved by the U.S. Food and Drug Administration. A registered phase 2a trial (NCT07505745) is testing investigational MOTS-c against placebo for insulin sensitivity in adults with prediabetes and overweight or obesity [12]. FDA's Pharmacy Compounding Advisory Committee placed MOTS-c on its July 2026 meeting agenda [13]. The World Anti-Doping Agency's Prohibited List covers it for athletes in tested sport [14].
The full details, with dates, are on our MOTS-c legal status page. This page does not cover the regulatory status of NAD+ products, because it varies by product type and country and is outside the sources listed here.
Frequently asked questions
Is MOTS-c a type of NAD+?
No. MOTS-c is a 16-amino-acid peptide encoded in mitochondrial DNA [1], while NAD+ is a coenzyme made through metabolic pathways [3]. They are different kinds of molecules that happen to be studied in overlapping areas of metabolism research.
Does MOTS-c work through NAD+?
The MOTS-c studies cited here describe effects involving the folate cycle, the energy sensor AMPK and nuclear gene activity [1][2]. They do not establish a direct link to NAD+. Any claim that the two "work together" goes beyond what these sources report.
Why is there so much more research on NAD+?
NAD+ was identified long before MOTS-c and is essential to basic chemistry in every cell, so it has been studied across biology for decades [3][5]. MOTS-c was first described in 2015, and most research on it is still at the cell and animal stage [1][8].
Further reading
Comparisons like this one make more sense with a solid grounding in how cells produce and manage energy. A good general book on cell biology or mitochondria can explain the basics of energy metabolism, coenzymes and cellular signalling at a comfortable pace, so new research headlines are easier to judge.
When comparing books, a few neutral criteria are worth weighing: the author's research background, how recently the book was published or updated, whether claims are backed by references, how clearly it separates established science from speculation, the format (print, ebook or audio), the reading level, and whether the price and edition are clearly listed.
Introductory titles written by working scientists, with a reference list and a recent edition date, tend to age best. Books that promise dramatic results from a single molecule are usually a sign to keep looking.
Reading a library copy or a sample chapter first is an easy way to check whether the writing style and depth fit before choosing an edition. To learn how this site picks sources and handles affiliate links, read how this site works.
Last updated: 19 October 2026.
Related on this site
Is MOTS-c legal? FDA status and anti-doping rules, simply explained
Best books on mitochondria for beginners: a 2026 reading list
How to evaluate MOTS-c claims online: a beginner's checklist
Exercise and MOTS-c: what the research shows, in plain English
Not medical advice. This page reports published research and regulatory records for information only.
Research-only notice: Content on this site is provided for research and educational purposes only and is not intended for human use. It is not medical advice.
Translation notice: Some content on this site may have been machine-translated using Google Translate and may contain errors.
Verdin E et al. NAD⁺ in aging, metabolism, and neurodegeneration. Science. 2015. PMID 26785480
Chini CCS et al. Evolving concepts in NAD(+) metabolism. Cell Metab. 2021. PMID 33930322
Gao Y et al. MOTS-c Functionally Prevents Metabolic Disorders. Metabolites. 2023. PMID 36677050
U.S. FDA. July 23–24, 2026: Meeting of the Pharmacy Compounding Advisory Committee