MOTS-C is a mitochondrial-derived peptide — a 16-amino-acid signaling molecule encoded in mitochondrial DNA that regulates metabolic homeostasis through the AMPK pathway. It arrives as a lyophilized powder and needs to be reconstituted before use.
The process is the same as any other peptide, but MOTS-C has a unique consideration: the doses are relatively large (5-10mg) compared to peptides like BPC-157 or semaglutide, which means the dilution choice matters more for injection volume.
Research-context information only.MOTS-c is a research peptide. Protocols, doses, and reactions reported below come from published research and self-reported community sources. This article reports what has been documented, not what should be done. Consult a licensed physician for personal medical decisions.
Bacteriostatic water (BAC water) — not sterile water, not saline
Insulin syringes — 1mL (100 unit), 29-31 gauge
Alcohol swabs — for cleaning vial tops
A clean, flat workspace
Why bacteriostatic water? It contains 0.9% benzyl alcohol that prevents bacteria from growing in the solution. Regular sterile water has no preservative, so the vial must be used within 24 hours. For pulling multiple doses from a single 10mg vial, BAC water is essential — it allows up to 28 days refrigerated.
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Step-by-Step Reconstitution
Step 1: Clean Everything
Protocols describe wiping the tops of both vials (MOTS-C and BAC water) with alcohol swabs, then letting them air dry for 10 seconds. This prevents contamination — a step community resources flag as essential.
Step 2: Draw Your Bacteriostatic Water
Protocols describe using a fresh insulin syringe to draw the desired amount of BAC water. The amount added determines the concentration (see the dilution charts below).
For MOTS-C, the ideal water amount depends on vial size and dose. Because doses are large (5-10mg), the balance is between accurate measurement and reasonable injection volume. For a 10mg vial dosed at 5mg, 2mL of water gives 5,000mcg/mL — meaning each 5mg dose is 100 units (1mL), and the vial yields exactly 2 doses.
Step 3: Add Water to the Peptide Vial
Protocols describe inserting the needle into the MOTS-C vial at an angle, aiming at the glass wall — not directly at the powder — and letting the water trickle down the side of the vial gently.
Water is not squirted directly onto the powder. Peptides are fragile. Aggressive mixing can damage the molecular structure and reduce potency.
Step 4: Let It Dissolve
Protocols describe swirling the vial gently with a slow rotating motion rather than shaking it. The powder should dissolve within 1-2 minutes into a perfectly clear, colorless solution.
If particles remain after 5 minutes of gentle swirling, the peptide may be degraded. A properly manufactured MOTS-C dissolves easily.
Step 5: Store Correctly
Reconstituted vials are refrigerated immediately at 36-46F (2-8C). The reconstituted solution is stable for up to 28 days with bacteriostatic water.
Dilution Charts
Why 2mL for 10mg vials? It yields exactly 2 doses at 5mg each, with each dose being a full 1mL (100 units) — easy to draw, with little room for math mistakes. For 5mg vials used as single-dose, 1mL keeps the injection volume manageable.
The Math (So You Can Do It Yourself)
Here's the formula for any vial size and any amount of water:
Concentration = Peptide Amount (mcg) / Water Added (mL)
Then to find the injection volume:
Units to inject = Desired Dose (mcg) / Concentration (mcg/mL) x 100
Example: 10,000mcg vial + 2mL water = 5,000mcg/mL. For a 5mg (5,000mcg) dose: 5,000 / 5,000 x 100 = 100 units (1mL).
For a smaller dose: 10,000mcg vial + 2mL = 5,000mcg/mL. For a 10mg dose: 10,000 / 5,000 x 100 = 200 units — that exceeds a single syringe. Protocols describe either using less water (1mL gives 100 units for 10mg) or splitting into two injection sites.
A Reconstitution Calculator is available for those who prefer to input vial size and water amount to retrieve the unit count directly.
Affiliate disclosure: vendor links in this article are affiliate links — The Peptide Catalog may earn a commission if you buy through them, at no additional cost to you.
Common Mistakes
Shaking the Vial
Peptides are proteins. Shaking creates foam, which means air bubbles trapped against peptide molecules. This can denature (destroy) the peptide at the air-liquid interface. Protocols describe swirling gently rather than shaking.
Adding Too Much Water
This is the opposite problem from most peptides. Because MOTS-C doses are large (5-10mg), adding too much water means huge injection volumes. Adding 3mL to a 5mg vial means a 5mg dose requires the entire 3mL — far too much for a single subcutaneous injection. Documented protocols keep it at 1-2mL.
Not Accounting for Injection Volume
A 1mL subcutaneous injection is already on the larger side. When a dose calculation comes out above 1mL, protocols describe splitting it into two injection sites or using less reconstitution water. Injecting more than 1mL in a single subcutaneous site can cause discomfort and poor absorption.
Leaving It at Room Temperature
Reconstituted MOTS-C degrades rapidly above refrigerator temperature. Every hour at room temperature reduces potency. Protocols describe pulling the vial out, drawing the dose, and returning it to the refrigerator rather than leaving it on the counter during prep.
Reusing Needles
Each puncture through the rubber stopper dulls the needle and increases contamination risk. Protocols describe a fresh syringe every time — they cost pennies.
Freezing Reconstituted Peptide
Freezing a liquid peptide solution creates ice crystals that can shear the peptide bonds apart. Protocols describe freezing only lyophilized (powder) peptides. Once reconstituted, the solution is refrigerated — never frozen.
How Many Doses Per Vial?
This depends on the dose and frequency:
5mg vial:
At 5mg 3x/week = less than 1 week (single dose per vial)
At 5mg 2x/week = less than 1 week
10mg vial:
At 5mg 3x/week = ~2.3 days (2 doses per vial)
At 5mg 2x/week = 3.5 days (2 doses per vial)
At 10mg 2x/week = 1 dose per vial
MOTS-C is consumed faster than most peptides due to the higher per-dose amounts. A 4-week protocol at 5mg three times weekly requires 12 vials of 5mg or 6 vials of 10mg.
Storage Quick Reference
State
Temperature
Shelf Life
Lyophilized (powder)
Room temp
6-12 months
Lyophilized (powder)
Refrigerated
2+ years
Lyophilized (powder)
Frozen (-20C)
3+ years
Reconstituted (BAC water)
Refrigerated
Up to 28 days
Reconstituted (sterile water)
Refrigerated
Use within 24 hours
Estimates based on community-reported and manufacturer-stated figures; actual shelf life varies with peptide purity, packaging integrity, and storage conditions.
Community protocols for multi-vial storage describe keeping unopened vials frozen and reconstituting only what will be used within 3-4 weeks. With MOTS-C's higher per-dose amounts, some community sources describe reconstituting 2-3 vials at a time when running a multi-dose weekly protocol.
Frequently Asked Questions
How much bacteriostatic water is added to MOTS-C?
For a 5mg vial, adding 2mL of bacteriostatic water gives 2,500mcg/mL. For a common 5mg dose, that's 200 units (2mL) — the entire vial in one dose. For multi-dose use at 5mg, protocols describe adding 1mL to get 5,000mcg/mL, making each 5mg dose 100 units (1mL). For a 10mg vial at 2mL, a 5mg dose is 100 units.
Can sterile water be used instead of bacteriostatic water for MOTS-C?
It can, but bacteriostatic water contains 0.9% benzyl alcohol which prevents bacterial growth. With sterile water, documented protocols describe using the entire vial within 24 hours. Community reconstitution resources consistently describe bacteriostatic water as the documented choice for multi-dose use from a single vial.
How often is MOTS-C injected?
Common protocols use 5-10mg subcutaneously 2-3 times per week. Some protocols use 5mg daily for shorter cycles. Documented protocol frequency varies by application — metabolic-support protocols and exercise-performance protocols in the published literature differ in their reported timing and intervals.
How long does reconstituted MOTS-C last?
Reconstituted with bacteriostatic water and refrigerated at 36-46F (2-8C), MOTS-C is stable for up to 28 days. With sterile water, it is used within 24 hours.
Research Supplies for MOTS-C
Hand-picked storage, injection, and recovery supplies paired with MOTS-C protocols.
Lee, C., et al. (2015). The mitochondrial-derived peptide MOTS-c promotes metabolic homeostasis and reduces obesity and insulin resistance. Cell Metabolism, 21(3), 443-454. PMID:25738459
Kim, K.H., et al. (2023). Mitochondria-derived peptide MOTS-c: effects and mechanisms related to stress, metabolism and aging. Molecules, 28(3), 1229. PMC9854231
Reynolds, J.C., et al. (2021). MOTS-c is an exercise-induced mitochondrial-encoded regulator of age-dependent physical decline and muscle homeostasis. Nature Communications, 12, 470. PMC9905433
USP General Chapter 797: Pharmaceutical Compounding — Sterile Preparations. Storage and beyond-use dating guidelines for reconstituted peptides.
This guide is for educational and informational purposes only. It is not medical advice. MOTS-C is sold as a research compound and is not FDA-approved for human use. Reconstituting and self-administering peptides carries inherent risks including infection, contamination, and dosing errors. Always use proper sterile technique. Consult a qualified healthcare provider before starting any peptide protocol. The Peptide Catalog is not responsible for any adverse effects resulting from the use or misuse of information presented here.
