What MOTS-c is and what it is studied for
MOTS-c is a short peptide encoded in mitochondrial DNA, studied for its role in metabolic flexibility — how efficiently the body switches between burning glucose and fat under exercise stress. In research it is described as an exercise mimetic: it supports the mitochondrial signalling that governs the fat/glucose fuel switch and appears to amplify the metabolic adaptations training already triggers, rather than replacing the work.
The research interest is insulin sensitivity, endurance capacity and fat oxidation in people who train. There is no appetite effect and no gut burden. Progress is read on training numbers and labs, not the scale, and the house protocol has no ramp beyond a single run-in week, because MOTS-c research does not support a step-up schedule the way appetite-suppressing peptides do — the dose that works, works from week 2.
Who it suits — and who should not run it
Written for the trained adult researcher — someone with two to three zone-2 sessions and two to three resistance sessions a week already in the diary — who wants that work to land harder. Because it acts on glucose handling, anyone on glucose-lowering medication is outside the general protocol. The house exclusions:
Not for
- Pregnant, breastfeeding, or planning pregnancy in the next 6 months.
- Under 18.
- Type 1 diabetes, or type 2 diabetes on insulin or sulfonylureas — a hypoglycaemia risk the general protocol does not manage.
- Active cancer.
- Someone who is not currently training — the effect lives inside a training stimulus; without one there is little to amplify.
The house protocol
The 20 mg pen holds 300 clicks at 66.7 mcg per click. Twice weekly, subcutaneous in the abdomen a hand's width from the navel, alternating left and right sides each dose, in the morning on a training day — Monday and Thursday — with food and water, then train within 1–3 hours. The house dosing window for this pen is 2.5–10 mg per dose, with 5 mg as the default working dose.
Two phases: a one-week run-in at a reduced dose to confirm tolerance, then the working dose held for the rest of the cycle. Three injections a week sits inside the window but is reserved for advanced researchers who have completed a cycle at the standard frequency.
| Pen | Dose per injection | Clicks | Frequency | Timing | Cycle |
|---|---|---|---|---|---|
| MOTS-c 20 mg (66.7 mcg/click) | 2.5 mg | 38 | Monday + Thursday | Morning, fed, train within 1–3 h | Week 1 — run-in |
| MOTS-c 20 mg | 5.0 mg | 75 | Monday + Thursday | Morning, fed, train within 1–3 h | Weeks 2–8 — working dose, no further steps |
Total for the cycle: 2 × 38 + 14 × 75 = 1,126 clicks → 4 pens (1,200 clicks), with 74 clicks — about 4.9 mg, roughly one more dose — left over. MOTS-c is also sold as a 5 mg and a 10 mg pen, but at this schedule the 20 mg pen is the economical choice.
First-dose fatigue or lightheadedness is the thing to respect: inject fed, with a glass of water alongside, and avoid driving or heavy machinery for the first hour after the first two or three doses until you know how you respond. Keep the pen in the fridge between uses.
Week by week — what people typically notice and when
| When | What is typically reported |
|---|---|
| Weeks 1–2 | Run-in, then the working dose. Training tolerance is the main thing to notice — sessions should feel steady, not harder. |
| Weeks 2–3 | Most researchers report training tolerance shifting first: sessions that felt like a grind start to feel more sustainable. |
| Weeks 4–6 | Endurance and recovery show most clearly — zone-2 pace holds at a lower heart rate, resistance sessions recover faster between sets and days. |
| Weeks 6–8 | Body-composition changes, where they occur, show up last and are a product of the training and nutrition the protocol assumes, not the pen alone. |
The training is the one part that is not optional: zone-2 aerobic work two to three times a week for 40–60 minutes, resistance training two to three times a week, and the dose taken fed in the morning with training 1–3 hours later. Carbohydrates stay in around training — the research signal is flexibility between fuels, not carbohydrate restriction. No fasted heavy sessions in week 1.
Labs we ask for before and during
| Marker | When | Why it is on the list |
|---|---|---|
| Fasting glucose, fasting insulin, HbA1c | Baseline · week 8 | The core read on the metabolic-flexibility effect this pen targets |
| Lipid panel | Baseline · week 8 | Fat-oxidation shifts often show here too |
| Liver panel | Baseline · week 8 | General safety check over the cycle |
| Cystatin C (never creatinine alone) | Baseline · week 8 | Kidney measure not distorted by muscle or creatine |
| Ferritin | Baseline | Iron status affects both endurance capacity and the HbA1c reading |
| VO2 or lactate test | Baseline · week 8 (optional) | A direct read on endurance capacity, if available |
| Resting heart rate | Weekly | A simple marker of recovery and cardiovascular adaptation |
Same lab, same time of day, before the injection and not the day after training — otherwise the week-8 decision is made on noise. Protein 1.6–2.0 g per kg of goal body weight; vitamin D, magnesium and omega-3 are the only general supplements.
Stacking: what it pairs with
MOTS-c is the training-day half of the energy corner of the library. NAD+ on Monday and Thursday mornings is its most common companion — two quiet compounds, different mechanisms, both judged on how sessions feel and what the labs say. For the researcher whose goal is the waist rather than the watts, tesamorelin at night complements MOTS-c in the morning without overlapping.
Alongside a fat-loss cycle on retatrutide or tirzepatide, MOTS-c keeps the training quality up without adding to the gut load — but the combination of two compounds acting on glucose handling moves fasting glucose and HbA1c to the top of the list and belongs in a personalised protocol.
Common mistakes
- Running it without training. The effect has nowhere to land. This is the whole point of the compound.
- Injecting on a rest day. Monday and Thursday are chosen so the dose lands 1–3 hours ahead of a session.
- Dosing fasted in week 1. Fed, with water, until tolerance is known; fasted training can come back from week 2.
- Cutting carbohydrate. MOTS-c is about flexibility between fuels, not restriction. Carbs around sessions support the sessions.
- Watching the scale. Read progress on zone-2 heart rate, recovery and the week-8 labs.
- Jumping to three doses a week. That frequency is reserved for researchers who have completed a cycle at the standard two.
Frequently asked questions
How many clicks is a MOTS-c dose on the 20 mg pen?
The 20 mg pen delivers 66.7 mcg per click from 300 clicks. The house protocol is 38 clicks (2.5 mg) on Monday and Thursday in week 1, then 75 clicks (5.0 mg) on the same days for weeks 2–8.
When should I inject MOTS-c — before or after training?
Before. Take it in the morning on a training day, with food and water, and train within 1–3 hours. The schedule puts the doses on Monday and Thursday so they land ahead of a session, not on a rest day.
Is MOTS-c a weight-loss peptide?
No. It is studied for metabolic flexibility, insulin sensitivity, endurance and fat oxidation in people who train. Body-composition changes, where they occur, arrive last and come from the training and nutrition the protocol assumes.
How many pens does an 8-week MOTS-c cycle take?
Four 20 mg pens — 1,126 clicks of the 1,200 available, leaving 74 clicks, roughly one more dose. At this schedule the 20 mg pen is more economical than the 5 mg or 10 mg versions.
Can I use MOTS-c if I take diabetes medication?
Not under the general protocol. Type 1 diabetes, or type 2 diabetes on insulin or sulfonylureas, is an exclusion because MOTS-c acts on glucose handling and the combination is a hypoglycaemia risk — that belongs in a personalised protocol with your prescriber.
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