MOTS-c Peptide Therapy in Philadelphia
Medically reviewed by Charlie Seltzer, MD, CSCS · Updated October 2026
MOTS-c is a peptide your own mitochondria make, and it's studied for how the body handles sugar, burns fat and powers muscle. Researchers sometimes call it an "exercise mimetic" because exercise raises it naturally. Dr. Seltzer can now prescribe it, compounded to pharmacy standards, as part of a physician-led metabolic plan.
What is MOTS-c?
Most of your DNA sits in the nucleus of each cell. A small amount lives in your mitochondria, the parts of the cell that turn food into energy. In 2015, researchers discovered that mitochondrial DNA codes for a 16-amino-acid peptide they named MOTS-c.
MOTS-c acts like a messenger from your mitochondria to the rest of the cell. In lab research it appears to switch on AMPK, the same energy-sensing pathway activated by exercise and by the diabetes drug metformin. Under stress, it even travels into the cell's nucleus to help turn on protective genes. Scientists are still mapping exactly how it works.
Two facts make it especially interesting:
- Levels fall with age. Older adults tend to have less circulating MOTS-c than younger ones.
- Exercise raises it. In a human study, MOTS-c levels in muscle and blood rose sharply during and after intense exercise.
Fun fact: Scientists finished sequencing human mitochondrial DNA back in 1981 and assumed they knew everything it made. MOTS-c was hiding in it for more than 30 years until researchers at USC spotted it in 2015.
What MOTS-c is used for
- Insulin resistance and prediabetes: helping muscle take up and use glucose
- Fat loss and weight-loss plateaus
- Exercise capacity and endurance
- Muscle health with age
- Healthy aging and metabolic longevity
What the research actually shows
| Evidence | What exists |
|---|---|
| Discovery study (2015) | In mice on a high-fat diet, MOTS-c prevented obesity and insulin resistance |
| Aging and performance | In mice, MOTS-c improved physical performance in both young and old animals |
| Human biology | Exercise raises the body's own MOTS-c; levels decline with age |
| Human trials of MOTS-c treatment | None published yet. A 12-week trial in prediabetes and obesity is recruiting |
| FDA status | Not FDA-approved. Available through licensed compounding under HHS's October 2026 enforcement policy |
Bottom line: the biology is compelling and the animal results are striking, but MOTS-c hasn't been tested as a treatment in people yet. That makes physician oversight and real lab monitoring essential.
FDA's advisory review looked at MOTS-c for two uses: obesity and osteoporosis.
MOTS-c and GLP-1 medications
Many patients ask about MOTS-c alongside GLP-1 medications. The two target different parts of the problem:
| GLP-1 medications | MOTS-c | |
|---|---|---|
| Main target | Appetite and fullness | How cells use energy |
| Where it works | Gut and brain signals | Muscle and mitochondria |
| Evidence | Large human trials, FDA-approved | Animal studies, early human research |
One known downside of rapid GLP-1 weight loss is losing muscle along with fat. MOTS-c is being studied for its role in muscle metabolism, which is why some physicians are interested in it for patients on GLP-1s who are also training. That pairing hasn't been studied in a trial, so Dr. Seltzer decides case by case, with strength training and protein as the foundation. Learn about our medical weight loss program →
Gray market vs. prescribed by Dr. Seltzer
| Online "research" peptides | Dr. Seltzer Lifestyle Medicine | |
|---|---|---|
| Source | Often unknown, frequently overseas | FDA-registered, CGMP ingredient manufacturer |
| Testing | Rarely verified | Identity, purity, potency and contaminant testing |
| Dosing | Forum guesswork | Set by a physician |
| Lab work | None | Baseline and follow-up metabolic labs |
| Monitoring | None | Physician follow-up throughout |
How MOTS-c is taken
MOTS-c is given as a small under-the-skin or intramuscular injection, dispensed with a standard syringe. Dr. Seltzer sets the dose and schedule, and tracks progress with labs such as fasting glucose, insulin and A1C.
Who MOTS-c is right for, and who should avoid it
MOTS-c may fit patients with insulin resistance or prediabetes, those stuck on a weight-loss plateau, and active adults focused on metabolic health and longevity.
It is not recommended if you:
- Are pregnant or breastfeeding
- Are under 18
If you take insulin or other glucose-lowering medication, your blood sugar needs closer monitoring. Your evaluation covers your full history and medications first.
A doctor who knows both sides
Dr. Charlie Seltzer is a physician, a certified strength and conditioning specialist, and a national-level bodybuilding champion. He's spent his career on the intersection of metabolism, training and weight loss, which is exactly where MOTS-c sits.
Also see: All six peptides · Weight Loss · Personal Training · Epitalon
Frequently asked questions
Is MOTS-c legal now?
Yes, when prescribed by a physician and compounded by a licensed pharmacy that meets the HHS quality requirements announced October 28, 2026. It is still not FDA-approved.
Does MOTS-c help with weight loss?
In mice, it prevented diet-induced weight gain and insulin resistance. It hasn't been tested for weight loss in human trials yet.
Can I take MOTS-c with a GLP-1 like semaglutide or tirzepatide?
That combination hasn't been studied in trials. Dr. Seltzer evaluates whether it makes sense for you individually.
Is MOTS-c the same as metformin?
No. They're completely different substances, but both appear to activate the same energy-sensing pathway, AMPK.
Where can I get MOTS-c in Philadelphia?
Dr. Seltzer Lifestyle Medicine, 1429 Walnut Street, Suite 401, in Center City, with virtual visits available.
Start with a consultation
MOTS-c is a compounded drug product and is not FDA-approved. It is available by prescription under the U.S. Department of Health and Human Services' 2026 enforcement discretion policy for 503A compounding. Individual results vary.