MOTS-c Peptide Sequence: The 16-Amino-Acid Chain Explained

MOTS-c is a 16-amino-acid peptide whose sequence is MRWQEMGYIFYPRKLR in single-letter code. Written out fully, the mots-c peptide sequence is methionine, arginine, tryptophan, glutamine, glutamic acid, methionine, glycine, tyrosine, isoleucine, phenylalanine, tyrosine, proline, arginine, lysine, leucine, and arginine. The peptide is encoded inside mitochondrial DNA rather than the nuclear genome, which is what makes it unusual among signaling peptides.

MOTS-c is not FDA-approved for human use in the United States.

The MOTS-c Amino Acid Sequence, Residue by Residue

The full chain is short enough to list position by position. Its molecular weight is roughly 2.1 kDa, and it carries several positively charged residues toward the end of the chain.

Position	One-letter code	Amino acid	Side-chain character
1	M	Methionine	Nonpolar
2	R	Arginine	Basic
3	W	Tryptophan	Aromatic
4	Q	Glutamine	Polar
5	E	Glutamic acid	Acidic
6	M	Methionine	Nonpolar
7	G	Glycine	Nonpolar
8	Y	Tyrosine	Aromatic
9	I	Isoleucine	Nonpolar
10	F	Phenylalanine	Aromatic
11	Y	Tyrosine	Aromatic
12	P	Proline	Nonpolar
13	R	Arginine	Basic
14	K	Lysine	Basic
15	L	Leucine	Nonpolar
16	R	Arginine	Basic

Two structural features stand out. The middle of the chain is rich in aromatic residues such as tryptophan, tyrosine, and phenylalanine, while the C-terminal tail (Arg-Lys-Leu-Arg) is strongly basic. Researchers have proposed that this basic tail helps the peptide enter cells and reach the nucleus during metabolic stress.

Where the Sequence Comes From

MOTS-c stands for Mitochondrial Open Reading Frame of the 12S rRNA-c. A research group at the University of Southern California described the peptide in 2015, showing that a short open reading frame inside the mitochondrial 12S rRNA gene is translated into a working peptide.

• Source: mitochondrial DNA, 12S rRNA region
• Length: 16 amino acids
• Common shorthand: MRWQEMGYIFYPRKLR
• First reported: Cell Metabolism, 2015

Because mitochondrial DNA is inherited only from the mother, the chain is highly conserved across mammals. A near-identical sequence appears in mice, rats, and humans, which is one reason animal models are used so heavily in this area of research.

What the Sequence Appears to Do

Laboratory work in cells and rodents suggests MOTS-c acts as a metabolic signal rather than a classic hormone. Reported effects include AMPK activation, improved insulin sensitivity, and shifts in fatty-acid oxidation.

A 2021 study proposed that MOTS-c also interacts with the folate-methionine cycle and helps regulate one-carbon metabolism. In aged mice, raising MOTS-c levels was associated with better metabolic markers, but those findings have not been reproduced in controlled human trials.

Every published MOTS-c finding to date comes from cell cultures or animal models. No human clinical trial has established that MOTS-c treats any disease or produces weight loss in people.

Research Use, Dosing, and What People Search For

There is no established mots-c peptide dosage protocol

No regulatory agency has approved a dose of MOTS-c for humans, and no phase 1 trial has reported a safe human dose. In rodent studies, researchers often inject about 0.5 mg/kg per day intraperitoneally for short periods, but animal dosing does not transfer directly to people. Anyone looking for a mots-c peptide dosage protocol should start with a licensed clinician rather than a vendor's label.

What mots c peptide weight loss results actually show

Online claims about mots c peptide weight loss results usually trace back to high-fat-diet mouse studies, where treated animals gained less fat and handled glucose better than controls. No human trial has measured weight change from MOTS-c, so there are no verified human weight loss results to cite. Treating an unapproved research peptide as equivalent to a prescription obesity drug is not a fair comparison.

MOTS-c Compared With Tirzepatide

Feature	MOTS-c	Tirzepatide
FDA status	Not approved for human use; sold as a research chemical	Approved for type 2 diabetes and chronic weight management
Mechanism	Mitochondrial peptide linked to AMPK and folate-cycle signaling	Dual GIP and GLP-1 receptor agonist
Human trial data	None for weight loss or disease treatment	Large randomized controlled trials
Typical use	Animal and cell experiments only	Weekly subcutaneous injection under medical supervision
Dose	Not established for humans	Titrated to 5-15 mg weekly in trials

Anyone weighing mots-c peptide vs tirzepatide should note that only one of the two has cleared human safety trials and FDA review. Tirzepatide carries known side effects and requires a prescription; MOTS-c carries unknown risks because it has never been tested that way in people.

What a mots-c peptide price usually reflects

Prices for research-grade MOTS-c vary widely, and a low mots-c peptide price often signals a small vial size, low purity, or no independent testing. US-facing vendors typically label the product "for research use only," which means it is not intended for human consumption. Third-party HPLC results and a current certificate of analysis matter far more than the sticker price.

Safety, Legality, and Sourcing Warnings

• MOTS-c is not FDA-approved for human use in the United States.
• Research peptides sold online are not produced under pharmaceutical GMP rules.
• Injection carries risks of contamination, infection, and allergic reaction.
• Ordering from an overseas seller does not make a research chemical legal to put in your body.

Anyone considering a research peptide for personal use should speak with a licensed healthcare professional first. Self-experimentation with unapproved peptides is not a recognized treatment strategy for obesity, diabetes, or aging.

Key Takeaways

1. The MOTS-c peptide sequence is MRWQEMGYIFYPRKLR, a 16-residue chain encoded in mitochondrial DNA.
2. MOTS-c is a research peptide, not an approved medicine.
3. Human dosing, weight-loss effects, and long-term safety remain unestablished.
4. Prescription options with human trial data exist, and a clinician can explain them.

COMMON QUESTIONS

Frequently Asked Questions

What is the exact amino acid sequence of MOTS-c?

The MOTS-c peptide sequence is MRWQEMGYIFYPRKLR in single-letter code, which is 16 amino acids long. Spelled out, it is methionine, arginine, tryptophan, glutamine, glutamic acid, methionine, glycine, tyrosine, isoleucine, phenylalanine, tyrosine, proline, arginine, lysine, leucine, and arginine.

Is MOTS-c approved for human use in the United States?

No. MOTS-c is not FDA-approved for human use, and it is sold only as a research chemical. No human clinical trial has established a safe dose or a proven benefit, so it should not be injected without medical supervision.

Does MOTS-c cause weight loss in humans?

There is no human evidence that MOTS-c causes weight loss. Reported metabolic benefits come from rodent and cell studies, and those results do not prove the same effects in people. Prescription medications such as GLP-1 drugs have human trial data; MOTS-c does not.