[Skip to the reading](#reading) A little clarity, from Summer. [Summer](/) [The guides](/#the-guides)[Your questions](/#the-goals)[About Summer](/about/) **Explore +** [The guides](/#the-guides)[Your questions](/#the-goals)[About Summer](/about/)[Common questions](/faq/)[The glossary](/glossary/)[Contact](/contact/) [Summer](/)/MOTS-c The compound guides # MOTS-c. Leave room for doubt. MOTS-c brings together interesting biology and large gaps in human knowledge. This guide keeps those two things together, without assuming an expected result. [Start a Promise Peptides consultation for MOTS-c↗](https://mypromise.com/products/mots-c?utm_source=summer&utm_medium=affiliate&utm_campaign=compound&utm_content=opening) Summer may earn money when readers become Promise patients. Promise Peptides prescribes now through licensed U.S. providers. A provider reviews each request and decides; not everyone qualifies. U.S. patients only. Availability varies by state and treatment. Compounded medicines are not FDA-approved. ![A small fig leaf casting a shadow on a lavender garden door.](/summer-garden-740959b639c2/img/mots-c.webp) Small details invite a closer look. Measuring a substance the body makes does not test a treatment made from it. On this page - [A name from inside the cell.](#inside-the-cell) - [Keep the study setting in view.](#what-was-studied) - [The FDA status is not a footnote.](#what-fda-says) - [A listing begins a question.](#beyond-a-listing) ## A name from inside the cell. MOTS-c is a peptide, a short chain of the building blocks of proteins. Its genetic instructions are found in mitochondria, the small parts of cells involved in energy processes. Researchers have measured naturally occurring MOTS-c in human blood and muscle. Finding a substance in the body is not the same experiment as giving someone a lab-made version. It does not establish what an injection will do, what amount reaches a target or what risks may arise. ## Keep the study setting in view. Much of the research concerns cells and mice. There is also work measuring people’s own MOTS-c. Those studies ask different questions from a trial that gives MOTS-c to people as a treatment. The FDA’s review found no human safety or effectiveness data to support the proposed uses it considered. It also identified missing basic animal safety tests. A study of a related, altered compound would not automatically settle questions about MOTS-c itself. ## The FDA status is not a footnote. MOTS-c has no FDA-approved medical use. The FDA’s page current as of April 22, 2026, lists it as “nominated but withdrawn.” The request for consideration was withdrawn; FDA did not clear the substance or approve it for compounding. The agency still states that it lacks important safety information. Peptides that clump or contain impurities may prompt immune reactions, where the body responds to them as invaders. These are stated concerns, rather than a measured rate of harm in people taking MOTS-c. ## A listing begins a question. Promise offers MOTS-c consultations. Compounded MOTS-c is not FDA-approved. A provider reviews the request, and a pharmacy separately checks whether a prescription can lawfully be prepared. A service page cannot answer either question for an individual. - Is the finding about natural MOTS-c levels or a substance given as treatment? - Was the experiment in people or animals? - What human safety questions remain unanswered? The [recovery guide](/goals/recovery/) keeps everyday goals apart from research results. The [way we check our writing](/method/) explains why those distinctions stay on the page. ## Read a little further. - [The FDA’s review](https://www.fda.gov/media/193347/download) - [The FDA’s page](https://www.fda.gov/drugs/human-drug-compounding/certain-bulk-drug-substances-use-compounding-may-present-significant-safety-risks) ## When a question needs a provider. A consultation is a place for a licensed review of your health. It can end without a prescription. There is room for that answer too. [Start a Promise Peptides consultation for MOTS-c↗](https://mypromise.com/products/mots-c?utm_source=summer&utm_medium=affiliate&utm_campaign=compound&utm_content=closing) Summer may earn money when readers become Promise patients. Promise Peptides prescribes now through licensed U.S. providers. A provider reviews each request and decides; not everyone qualifies. U.S. patients only. Availability varies by state and treatment. Compounded medicines are not FDA-approved. [Summer](/) Room for the questions. Care with the answers. ## Start somewhere - [The compound guides](/#the-guides) - [The goal guides](/#the-goals) - [Common questions](/faq/) ## A little context - [About Summer](/about/) - [The glossary](/glossary/) - [How we write and check](/method/) ## Keep in touch - [The reading shelf](/references/) - [Contact](/contact/) - [Read in Markdown](/guides/mots-c/index.md) Summer may earn money when readers become Promise patients. Summer Peptides is an independent guide and is not Promise Peptides. Summer is a place to read and ask better questions; it offers no clinic, pharmacy or shop, and these pages cannot give personal medical advice. Promise Peptides prescribes now through licensed U.S. providers. A provider reviews each request and decides; not everyone qualifies. U.S. patients only. Availability varies by state and treatment. Compounded medicines are not FDA-approved. If a provider prescribes, a licensed U.S. compounding pharmacy separately decides whether it can lawfully prepare the prescription. Compounded medicines are not FDA-approved. Promise is LegitScript-certified; that certification is not FDA approval. © 2026 Summer Peptides [How Promise Peptides works](https://mypromise.com/products/mots-c?utm_source=summer&utm_medium=affiliate&utm_campaign=compound&utm_content=footer)