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Weight Loss & Metabolic

MOTS-c

Also called MOTS, MOTSc, MOTS c

MOTS-c is a tiny peptide your own mitochondria make, and it works like a metabolic switch.

Where this answer comes fromAnimal and lab research

The published research here is animal and laboratory work. The ranges below come from community-reported dosing and results — what people have settled on in practice, and what they report happening.

The quick answer

MOTS-c is a tiny peptide your own mitochondria make, and it works like a metabolic switch. It flips on AMPK - the same energy sensor that exercise activates - nudging your cells to burn fat for fuel, handle blood sugar better, and build more mitochondria. That's why people call it "exercise in a vial."

Don't expect a jolt: MOTS-c is cumulative. The first week can feel like nothing, then steadier energy and better workout tolerance show up around weeks 2–3, with body-composition changes building over the cycle. Taking it fasted or before training seems to get the most out of it. Honest note - the science is exciting but still mostly from the lab, so regard it as promising rather than proven.

Why people use it

⚡ Energy and endurance like you trained more; 🔥 Burns fat for fuel; 📉 A leaner body composition; 🩸 Better blood-sugar control; 🏋️ Amplifies your workouts

What people report using

These are ranges other people have reported running. They are here so you can see what has actually been done — they are not medical advice and not a recommendation for you.

People report running this anywhere from 2.5mg to 10mg, 5× a week.Where somebody sits in that range depends on what they are using it for and what they are starting from — the low end is a deliberate choice a lot of people make, not a half-hearted version of the high end.

Performance — five days a week5mg

Energy

How often
5× a week
Route
subcutaneous
Where this comes from
Animal and lab research

Used by people training most days.

More — 10mg, three times a week10mg

Energy

How often
3× a week (Mon/Wed/Fri)
Route
subcutaneous
Where this comes from
Animal and lab research

Noticeably better endurance, steadier energy, and the "I can tell when I miss a dose" effect.

Standard — 5mg, three times a week5mg

Energy

How often
3× a week (Mon/Wed/Fri)
Route
subcutaneous
Where this comes from
Animal and lab research

Noticeably better endurance, steadier energy, and the "I can tell when I miss a dose" effect.

Lighter — 2.5mg, three times a week2.5mg

Energy

How often
3× a week (Mon/Wed/Fri)
Route
subcutaneous
Where this comes from
Animal and lab research

Noticeably better endurance, steadier energy, and the "I can tell when I miss a dose" effect.

Standard — 5mg, three times a week5mg

Fat loss & metabolic

How often
3× a week (Mon/Wed/Fri)
Route
subcutaneous
Where this comes from
Animal and lab research

Better output in training and less of the flat, heavy feeling in a deficit — that is the consistent one.

40mg vial + 3ml BAC water = 13.33mg/ml. 2.5mg = 19u (0.19ml), 5mg = 38u (0.38ml), 10mg = 75u (0.75ml). Monday, Wednesday and Friday, morning fasted or before training.

Work out your own units on the reconstitution calculator — the most common serious mistake in this area is arithmetic, not chemistry.

What to expect, and when

First thing people notice
Weeks 2–3 (energy, exercise)
When it gets real
Weeks 4–6 (body comp)
Where it peaks
Week 6 (cycle peak)
Patience needed
Medium - cumulative
The bit people get wrong

💡 MOTS-c's effects are cumulative and build over the cycle. The first week may feel like nothing. Weeks 2–6 are where the protocol pays off. Taking it fasted or pre-workout maximises the metabolic activation effect - timing matters more for MOTS-c than for most other compounds.

Side effects, and what people do about them

Nice and easy. Most people just feel the metabolic lift; a few notice a little tiredness early on as things shift. Because it works on how your body handles energy, anyone keeping an eye on blood sugar can simply keep their doctor in the loop. Otherwise very quiet.

Go deeper

Open these only if you want them.

How it actually works

A sixteen-amino-acid peptide encoded not in the cell nucleus but in mitochondrial DNA, within the 12S rRNA region - one of a small family of mitochondrial-derived peptides. It activates AMPK, the cell's low-energy sensor, which shifts metabolism toward fatty-acid oxidation and glucose uptake and away from storage.

For stacking, AMPK is a well-populated crossroads: it is the same node metformin acts on, and exercise and fasting activate it too. That does not make combining them dangerous, but it does mean the effects are unlikely to be simply additive. SS-31 is the more complementary pairing, because it works on mitochondrial structure rather than on the same signalling switch.

What people report, in full

The dosing-unit argument that ran through the first half of the year has largely settled, and it settled on milligrams. Real practice now clusters between about 1mg and 5mg per shot, and 0.25mg is the amount people describe feeling nothing on. Worth knowing that our 5mg three times a week sits at the top of that range rather than in the middle - plenty of people run 1-2.5mg and report the same thing. The responder split has not changed: roughly half describe better endurance and a noticeably easier second half of a workout within the first week or two, and roughly half feel nothing at all, often across more than one vendor. Two practical notes come up more than they used to. Some people get a histamine flush, which is why working up slowly rather than opening at the top is the common advice. And injection-site lumps are clearly amount-driven - they are a frequent complaint at 5mg daily and rare lower down.

Worth knowing

Never properly tested in people

This is the normal state of this category and it is not a black mark. It usually means nobody could patent the molecule tightly enough to fund a trial. It is not the same as having been tested and failed.

Sources and review

What people report

This record is built on what the wider community reports doing and experiencing, summarised above. No counted dataset has been attached to this compound yet — when one is published, it goes here with its numbers.

References

Lee C, et al. The Mitochondrial-Derived Peptide MOTS-c Promotes Metabolic Homeostasis and Reduces Obesity and Insulin Resistance. Cell Metab 2015;21(3):443.Diet-induced obesity in mice.

Reynolds JC, et al. MOTS-c is an exercise-induced mitochondrial-encoded regulator of age-dependent physical decline and muscle homeostasis. Nat Commun 2021.Mouse work plus human exercise data.

These references were located by literature search and recorded as the primary sources behind this record. The publishers block automated retrieval, so they are pointers to the right papers rather than quotations we have checked line by line. They are replaced as we read them properly.

Last reviewed 2026-09-06.

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