How to Reconstitute & Dose Peptides

Reconstitution is the process of dissolving lyophilized (freeze-dried) peptide powder into a liquid solution so it can be accurately measured and used in research. The standard solvent is bacteriostatic water (BAC water), which is sterile water containing 0.9% benzyl alcohol as a preservative. This preservative is what allows the reconstituted solution to remain stable for up to 30 days in the refrigerator, compared to sterile water which has no preservative and must be used immediately.

Here's the step-by-step process. First, gather your supplies: the peptide vial, a vial of bacteriostatic water, an insulin syringe (typically 1ml/29 gauge), and alcohol swabs. Swab the rubber stopper of both the peptide vial and the BAC water vial with alcohol and let them air dry for a few seconds. Draw your desired amount of BAC water into the syringe, a common amount is 1ml or 2ml depending on the concentration you want.

Insert the needle into the peptide vial through the rubber stopper. Here's the critical part: do not spray the water directly onto the powder. Instead, aim the needle at the inside wall of the vial and let the water trickle down slowly. This prevents damaging the peptide's molecular structure. Once all the water is in the vial, do not shake it. Gently roll the vial between your palms or swirl it in small circles until the powder is fully dissolved. This usually takes 1-3 minutes. The solution should be clear with no visible particles.

Now for dosing math. If you have a 5mg vial and you add 1ml of BAC water, every 0.1ml (10 units on an insulin syringe) contains 500mcg (0.5mg) of peptide. If you add 2ml, every 0.1ml contains 250mcg. The formula is: dose per unit = (total peptide in mcg) / (total water in units). So for a 10mg vial reconstituted with 2ml: 10,000mcg / 200 units = 50mcg per unit. To get a 250mcg dose, you'd draw 5 units.

After reconstitution, store the vial upright in the refrigerator at 2-8°C. Never freeze a reconstituted peptide. Use within 28-30 days. Always swab the stopper before each draw, and use a fresh syringe every time. If the solution becomes cloudy, discolored, or shows floating particles, discard it.

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