Peptide Reconstitution Calculator
Calculate exact syringe units for your research compound. Enter your vial size, bacteriostatic water volume, and target amount.
Reconstitution Calculator
Vyrex Research · Based on U-100 insulin syringe (100 units = 1 mL)
Research use only. Calculations assume a U-100 insulin syringe (100 units = 1 mL). Always verify your measurement visually. Vyrex Research products are sold for laboratory research purposes and are not intended for human consumption, medical, or diagnostic use.
Reconstitution FAQ
Common questions about preparing research compounds
Enter three values: the total milligrams of peptide in your vial (shown on the product label), the total milliliters of bacteriostatic water you added to reconstitute, and your target amount per draw. The calculator returns the exact units to draw on a U-100 insulin syringe, along with the concentration, mcg per unit, and total draws per vial.
Bacteriostatic water (bac water) is sterile water containing 0.9% benzyl alcohol, which inhibits bacterial growth and allows reconstituted peptides to remain stable for extended periods when refrigerated. Unlike standard sterile water, bac water can be used across multiple draws without compromising sterility. You can order bac water here.
A standard U-100 insulin syringe is marked in units where 100 units equals 1 mL (1 cc). Each small tick mark typically represents 1 or 2 units depending on syringe size. If the calculator says "draw to 10 units," pull the plunger back until the top edge of the plunger aligns with the 10-unit mark. Always check at eye level on a flat surface.
There's no single correct amount — it depends on the desired concentration and how long you want the vial to last. Common ratios: 1 mL for highly concentrated draws (smaller volume per draw), 2 mL for balanced concentration, 3-5 mL for diluted solutions and lower-volume vials. Use the calculator to test different volumes and see how each affects your draw size. More water = larger, easier-to-measure draws but more total volume used per draw.
(1) Let the lyophilized peptide vial reach room temperature. (2) Wipe both vial stoppers with an alcohol swab. (3) Draw your calculated amount of bac water into a syringe. (4) Slowly inject the bac water down the inside wall of the peptide vial — never directly onto the powder, which can damage the peptide. (5) Gently swirl (do not shake) until fully dissolved. (6) Store reconstituted vials refrigerated and use within the manufacturer's stability window.
One milligram (mg) equals 1,000 micrograms (mcg). Most research peptides are sold in mg quantities (e.g., 5 mg or 10 mg vials) but research protocols typically reference mcg amounts. The calculator handles both — toggle the dropdown next to "Target amount" to switch units.
Most reconstituted peptides remain stable refrigerated (2-8°C / 36-46°F) for approximately 28-60 days when reconstituted with bacteriostatic water, depending on the specific peptide. Some less stable compounds may degrade faster. Lyophilized (powder, unmixed) vials typically remain stable far longer — often 18-24 months at -20°C. Always reference your product's certificate of analysis (COA) for compound-specific guidance — view Vyrex COAs here.
If your draw is very small (under 5 units), you've reconstituted with too little water — making accurate measurement difficult. Add more bac water to dilute. If your draw exceeds 100 units (the full syringe), you've used too much water and need to draw twice or use a larger syringe. Aim for draws between 10-50 units for optimal accuracy.
