MOTS-c or SS-31? Both say "mitochondria." They mean different things.
The longevity conversation lumps these together because both are mitochondrial peptides, and that is roughly where the similarity ends. MOTS-c is a signaling peptide encoded in the mitochondrial genome itself, of interest for how it talks to metabolism, particularly around exercise. SS-31 goes at the machinery: it associates with the inner mitochondrial membrane, the physical architecture where energy is actually made. A signal versus a structure. Which angle fits you, if either does, is a clinician's call.
The short answer
If your interest is metabolic: energy, exercise response, the way training and metabolism talk to each other, MOTS-c is the compound aimed at that conversation. If your interest is the harder, deeper question of mitochondrial integrity itself, SS-31 is the one working at the membrane. Both sit at the young end of the evidence spectrum, and this category rewards skepticism; we would rather you arrive curious and leave with a clinician's honest read than arrive sold.
Side by side
| MOTS-c | SS-31 | |
|---|---|---|
| What it is | A mitochondrial-derived signaling peptide | A membrane-targeting peptide |
| The angle | Metabolic signaling, exercise-adjacent | Mitochondrial structure and integrity |
| The buyer | Metabolism and training focus | Cellular-energy and longevity focus |
| Evidence stage | Early, and honestly so | Early, with clinical research history |
| Regulatory status | Compounded to your prescription; not an FDA-approved drug product | Compounded to your prescription; not an FDA-approved drug product |
| Monthly cost | From $179/mo | From $179/mo |
Is there real research behind these?
Both have genuine research programs behind them; SS-31 in particular has been studied clinically under the name elamipretide, and MOTS-c is an active subject of metabolic research. Neither has the depth of evidence a settled medicine carries, and we will not pretend otherwise. That is what "early" means on this page, and your clinician will give you the same answer with your chart open.
What about NAD+?
Different category. NAD+ is a coenzyme your cells make and spend; these are peptides that interact with mitochondrial biology in specific ways. Some longevity-focused patients discuss more than one of these with a clinician, which is a plan, not a stack to self-assemble.
Questions
What happens if I am not approved?
You are not charged. Your clinician explains the reasoning and, where useful, what a better next step may be. Reviews are typically completed in under 24 hours.
Are these FDA approved?
No compounded medication is FDA-approved, including these. Compounded medicines are made to your individual prescription by a licensed pharmacy rather than manufactured and approved as a finished drug product.
Can I take both?
That is a clinician conversation, and a real one; the two work at different levels of the same system. Arrive with the question.
Ready when you are.
About 10 minutes. No charge unless your clinician approves.