How to reconstitute MOTS-c — visual step-by-step

What is reconstitution and why it matters for MOTS-c

MOTS-c (Mitochondrial Open reading frame of the twelve S rRNA-c) is a 16-amino-acid peptide encoded in the mitochondrial genome. It has been studied for its roles in metabolic regulation, insulin sensitivity, exercise mimicry, and aging. Research vials ship as lyophilized powder, typically 5–10 mg. MOTS-c is a shorter, unmodified peptide compared to GLP-1 agonists, so it generally dissolves readily and does not require extended swirling. However, precise reconstitution is still essential because research doses are small (commonly 5–10 mg per injection in animal models; smaller in cell-based studies), and errors in concentration directly impact dose accuracy.

Internal links: see the MOTS-c peptide profile at /peptides/mots-c, the MOTS-c mechanism and dosing guide, and /methodology.

Materials required

Gather: (1) MOTS-c research vial — commonly 5 mg or 10 mg lyophilized powder. (2) Bacteriostatic water for injection, 30 mL multi-dose vial. (3) Two 1 mL U-100 insulin syringes. (4) Two 70% IPA alcohol swabs. (5) Clean, flat workspace. (6) Sharps disposal container. (7) Permanent marker and adhesive label.

Step-by-step reconstitution protocol

Step 1 — Verify materials (see Diagram 1)

Confirm the MOTS-c vial contains white lyophilized powder with no discoloration or moisture. Confirm the BAC water vial is clear and within its use-by date. Wash hands for 20 seconds.

Step 2 — Swab both septa

Swab the BAC water septum with 70% IPA in a single outward stroke. Allow to air-dry for 10–15 seconds. Repeat with a fresh swab on the MOTS-c vial. Do not touch the swabbed surfaces.

Step 3 — Draw bacteriostatic water (see Diagram 2)

Insert a fresh needle into the BAC water vial, invert, and draw the required volume. For a 5 mg MOTS-c vial: 1.0 mL gives 5,000 mcg/mL; 2.0 mL gives 2,500 mcg/mL. For a 10 mg vial: 2.0 mL gives 5,000 mcg/mL. Because MOTS-c research doses per injection are typically in the 5–10 mg range for in-vivo models (and may be adjusted for body weight), selecting 2.0 mL reconstitution for a 5 mg vial (2,500 mcg/mL) gives a dose draw volume that is manageable.

Step 4 — Introduce water against the glass wall (see Diagram 3)

Tilt the MOTS-c vial at 45 degrees. Insert the needle through the septum, directing the tip at the inner glass wall. Introduce the bacteriostatic water slowly along the wall. MOTS-c, as an unmodified short peptide, is less prone to aggregation than lipidated peptides, but the wall-directed technique is still best practice to avoid foam and mechanical disruption.

Step 5 — Gently swirl to dissolve

Roll the vial between your palms for 15–30 seconds. MOTS-c dissolves readily into a clear, colorless solution. Do not shake or vortex. Inspect: the solution should be free of particulates and cloudiness.

Step 6 — Label and store (see Diagram 4)

Label with peptide name, concentration, reconstitution date, and 28-day expiry. Refrigerate at 2–8°C. Do not freeze the reconstituted solution. If the entire reconstituted volume will not be used within 28 days, consider reconstituting smaller fractions to minimize waste.

Dose math: translating research doses to U-100 syringe units

Example — 5 mg vial in 2.0 mL BAC water: concentration = 2,500 mcg/mL = 25 mcg per unit on U-100. A 5 mg (5,000 mcg) dose = 200 units (2 full syringes). A 2.5 mg dose = 100 units (1 full syringe). A 1 mg dose = 40 units. For weight-adjusted dosing in animal research: determine dose in mcg/kg, multiply by subject weight (kg), then divide by concentration (mcg/mL) to get volume in mL, then convert to U-100 units (1 unit = 0.01 mL).

Storage post-reconstitution

Reconstituted MOTS-c in bacteriostatic water: refrigerate at 2–8°C for up to 28 days. Do not freeze. Protect from light. As a short, unmodified peptide, MOTS-c is generally stable under refrigeration for this period with benzyl alcohol present as a preservative.

Common mistakes to avoid

Frequently asked questions