How to Reconstitute MOTS-c: Step-by-Step

Gather these supplies before you open anything:

• MOTS-c lyophilized vial (commonly 5mg or 10mg)
• Bacteriostatic water (0.9% benzyl alcohol)
• A 3mL syringe with a draw needle for the water
• Insulin syringes (U-100, 29 to 31 gauge) for dosing
• Alcohol swabs and a flat, clean surface

The direct answer: a 10mg MOTS-c vial reconstituted with 2mL of bacteriostatic water yields 5mg/mL, so 1 insulin unit (0.01mL) holds 0.05mg, or 50mcg. Adjust the water volume to set your preferred concentration. More water makes a more dilute solution that is easier to dose in small increments; less water makes a concentrated solution that uses fewer units per injection.

Use the Reconstitution Calculator for any vial size and water combination not listed below.

The technique matters more than speed. MOTS-c is a peptide, and rough handling shears the molecule.

1. 1.Wash your hands and clean a flat surface. Let both vials reach room temperature if they were refrigerated.
2. 2.Swab both rubber stoppers with an alcohol swab. Wipe the MOTS-c vial cap and the bacteriostatic water cap, then let them air dry.
3. 3.Draw the bacteriostatic water. Using a 3mL syringe, pull your chosen volume (1mL, 2mL, or 3mL) of bacteriostatic water into the syringe.
4. 4.Insert the needle into the MOTS-c vial at an angle so the tip rests against the inside glass wall. Push slowly and let the water run down the wall. Do not blast it directly onto the powder pellet.
5. 5.Remove the needle and swirl, do not shake. Roll the vial gently between your fingers or swirl it in a slow circle. Set it down and wait. The powder usually dissolves within one to two minutes.
6. 6.Inspect the solution. A correctly reconstituted MOTS-c vial is clear and colorless with no floating particles. Do not use a cloudy or particulate solution.

The pressure inside the vial rises as you add liquid. To avoid spraying, let the vacuum or pressure equalize before withdrawing the needle. For storing the finished vial, see how to store peptides.

The water volume you add is the single variable that decides how many insulin units equal one dose. Total MOTS-c stays fixed, so concentration is just milligrams divided by milliliters.

Worked example. You have a 10mg vial and add 2mL of bacteriostatic water. Concentration is 10mg / 2mL = 5mg/mL, which equals 5,000mcg per mL. A U-100 insulin syringe holds 100 units per mL, so each unit carries 5,000 / 100 = 50mcg.

If your target dose is 250mcg, divide 250 by 50 to get 5 units. Draw to the 5-unit mark. If your target is 500mcg, that is 10 units.

The same logic scales to any setup. Concentration per unit (mcg) = (vial mg × 1000) / (mL of water × 100). Plug your numbers into the Reconstitution Calculator to avoid arithmetic errors, and cross-check against the MOTS-c dosage protocol PDF for a printable reference. Once you confirm units, the where to inject MOTS-c guide covers site rotation.

Once reconstituted, MOTS-c is far less stable than the dry powder. The lyophilized vial can sit in a freezer for many months, but the liquid form has a short clock.

• Refrigerate the reconstituted vial at 2 to 8°C. The kitchen fridge door is too warm; place it on a shelf inside.
• Use within 28 to 30 days. The 0.9% benzyl alcohol in bacteriostatic water inhibits bacterial growth for roughly four weeks (USP standard), which sets the practical shelf life (Meyer et al., 2009).
• Do not freeze the reconstituted solution. Freeze-thaw cycles damage peptide structure, and repeated cycling is a known driver of peptide degradation in solution (Manning et al., 2010).
• Keep it out of light and date the vial when you first puncture it.

If you used plain sterile water instead of bacteriostatic water, the window collapses to about 24 hours because there is no preservative. The full breakdown is in how long do reconstituted peptides last. For cycle planning around that shelf life, see MOTS-c cycle length.

Most ruined vials trace back to five errors. Each one is avoidable.

Shaking the vial. Vigorous shaking creates foam and shears the peptide, lowering potency. Swirl gently instead, and wait for the powder to dissolve on its own.

Using the wrong water. Saline can interact with some peptides, and tap or distilled water is not sterile. Use bacteriostatic water for multi-dose vials. If a supplier ships "reconstitution solution," confirm what it contains, because reconstitution solution is not always the same as bacteriostatic water.

Overfilling the vial. Adding 3mL to a tiny vial can exceed its volume and force liquid back out the needle. Match your water volume to the vial size in the table above.

Blasting water onto the powder. A hard stream directed at the pellet can denature the peptide. Run the water down the glass wall instead.

Skipping the alcohol swab. Both stoppers must be wiped before each puncture to keep the solution clean. For a deeper sterile-technique comparison, see bacteriostatic water vs sterile water.