Doserly Reconstitution Calculator
What is Reconstitution?
Reconstitution is the process of dissolving a freeze-dried (lyophilized) compound — such as a peptide or hormone — into a liquid solvent to create an injectable solution. Most research peptides and certain hormones are shipped as a dry powder to preserve stability and shelf life.
This calculator guides you through the reconstitution process step by step. Enter your vial details, solvent volume, desired dose, and syringe type, and the calculator will determine the exact concentration of your solution and the precise amount of liquid to draw for each injection.
Understanding Compound Types
Peptides vs. Hormones
The two main types of compounds you may reconstitute are peptides and hormones. They differ in how they are measured and dosed.
Peptides are short chains of amino acids measured by weight in milligrams (mg) or micrograms (mcg). Because they are synthetically produced, their mass is consistent between batches. Examples include BPC-157, TB-500, and Semaglutide.
Hormones such as hCG and hGH are measured in International Units (IU) — a standardized measure of biological activity, not mass. IU ensures consistent dosing based on the compound's actual effect rather than its weight.
Milligrams vs. Micrograms
Peptide vials are labeled in milligrams (mg), but individual doses are often measured in micrograms (mcg). There are 1,000 mcg in 1 mg.
For example, a 10 mg vial of BPC-157 dosed at 250 mcg per injection would provide 40 doses. The calculator handles the mg/mcg conversion automatically.
Reconstitution Type
Select the type of compound you are reconstituting
Select whether you're working with a peptide (measured by weight) or a hormone (measured by biological activity in IU), as this determines the units used throughout the calculator.
About peptides
Peptides are short chains of amino acids with stable, reproducible mass. They are measured by weight in milligrams (mg) or micrograms (mcg). Because they are synthetically produced, their mass is consistent between batches, making weight-based dosing straightforward.
Common examples include BPC-157, TB-500, Semaglutide, and PT-141. Vials are typically labeled in mg (e.g., 5 mg or 10 mg), while individual doses are often in mcg (e.g., 250 mcg).
Key Terms
- Dissolving a freeze-dried (lyophilized) powder into a liquid to create an injectable solution.
- The freeze-drying process used to preserve compounds as a stable powder. The powder must be reconstituted before use.
Vial & Solvent Guide
Understanding Your Peptide Vial
The amount printed on a peptide vial is the labeled quantity — not necessarily the actual fill. Research peptide vials commonly deviate from their label.
The Certificate of Analysis (COA) for your manufacturing batch is the most reliable reference for estimating the actual fill amount. Switching suppliers or batches can result in different fill amounts even with identical labels.
Solvent Types
- Bacteriostatic Water (BAC)
- Sterile water with 0.9% benzyl alcohol as a preservative. The most common choice — allows multi-dose use over several weeks because the preservative inhibits bacterial growth.
- Sterile Water
- Pure water without preservatives. Once used to reconstitute a vial, the solution should ideally be used within 24 hours or refrigerated and used promptly.
- Sodium Chloride (0.9%)
- Saline solution sometimes required for specific compounds. Check your product documentation for solvent requirements.
How Concentration Works
Concentration is the amount of compound per unit of liquid, measured in mg/mL.
More solvent = lower concentration = larger draw volume per dose.
Less solvent = higher concentration = smaller draw volume per dose.
The amount of solvent you add is a balance: too little makes precise dosing difficult with small syringes, while too much may require drawing more liquid than your syringe can hold.
Vial Fill Amount Details
Enter the vial contents and reconstitution solvent details
Select the measurement unit to use
Enter the amount of peptide in the vial
About peptide fill amounts
The amount printed on a vial is the labeled quantity — not necessarily the actual fill. Research peptide vials commonly deviate from their label, and using the labeled amount alone when calculating reconstitution can result in significant underdosing or overdosing.
The for your manufacturing batch is the most reliable reference for estimating actual fill amount. For greater precision, send multiple randomized vials from the same batch for independent analysis and average the results.
Peptides from different suppliers or batches can have meaningfully different fill amounts even when identically labeled. This changes the concentration of your solution and the effective dose per injection — a common reason for unexpected responses when switching peptide sources or batches.
Reconstitution Solution Information
Enter the volume of solvent to add to the vial
Solvent 1
Volume
Dose & Syringe Guide
Why Dose & Syringe Selection Matters
Your desired dose and the solution's concentration together determine the draw volume — the amount of liquid to draw into the syringe for each injection.
Different syringe sizes (0.3 mL, 0.5 mL, 1 mL, 3 mL) have different capacities and graduation intervals. Choosing a syringe that closely matches your draw volume allows for more precise measurement.
Choosing the Right Syringe
- 0.3 mL Syringe
- Best for very small doses. Graduation marks often represent 0.005 mL (half a unit), offering the highest precision.
- 0.5 mL Syringe
- A good balance of precision and capacity. Common for most peptide doses. Graduations are typically every 0.01 mL (1 unit).
- 1 mL Syringe
- A standard insulin syringe size. Suitable for larger draw volumes. Graduations are typically every 0.01 mL (1 unit).
- 3 mL Syringe
- For large volumes. Often used for reconstitution when filling vials with multiple mL of solution. Less precise for small doses due to wider graduation spacing.
Graduation spacing can vary by manufacturer — always check the markings on your specific syringe.
Reading Syringe Markings
Most insulin syringes use the U-100 standard, meaning 100 units = 1 mL. Each unit mark equals 0.01 mL.
Some syringes show only units (0–100), others show mL (0–1.0 mL), and some show both. Use the scale toggle in the calculator to match your syringe's markings.
For example, a draw of 0.25 mL is the same as 25 units on a U-100 syringe.
Dose & Syringe
Set your target dose and choose a syringe for measurement
Select the dose measurement unit
Enter your target dose amount per injection
This is the amount of peptide you want to receive in each individual injection. The calculator will determine how much liquid to draw from the reconstituted vial to deliver this exact dose based on the vial's concentration.
Choose a syringe
Syringe Scale
mL vs Units on your syringe
Most insulin syringes use the standard, where 100 units = 1 mL. This means each unit mark on the syringe equals 0.01 mL.
Some syringes are marked only in units (e.g., 0–100), while others show mL (e.g., 0–1.0 mL), and some show both scales. Toggle between mL and Units above to match the markings on your syringe for easier reading.
For example, a draw of 0.25 mL is the same as 25 units on a U-100 syringe. If your syringe uses a different scale (such as U-40), the unit markings will not match — in that case, use the mL scale.
