Peptide Blend Math: What Each Component Is in a Single Draw
By Max Grev, Founder of Vitadel · 6 min read · Published
A peptide blend is a vial in which two or more peptides were combined before freeze-drying, with the label giving each component's amount in milligrams. Once you add water, every draw contains all the components in the label's ratio. Each component gets its own concentration, calculated from its own milligrams and the shared water volume, and a draw's content is that concentration times the draw volume. A blend of 5 mg and 10 mg in 2 mL gives a 10-unit draw of 0.25 mg and 0.5 mg.
This guide covers the arithmetic for a blend that arrived already combined. It does not cover whether any two peptides should be combined, which is a compounding question.
What changes and what does not
With a single-compound vial, one concentration describes the whole solution. With a blend, each component has its own concentration, and they share one water volume and one draw.
Two things follow. The ratio between components is fixed by the label and cannot be changed by anything you do at home. And every draw, however large or small, contains all the components. You cannot draw more of one than the others.
Step 1: each component's concentration
Divide each component's milligrams by the total milliliters of water you added. The other components do not enter this division.
| Component | Amount on label | Water added | Concentration |
|---|---|---|---|
| First | 5 mg | 2 mL | 2.5 mg/mL |
| Second | 10 mg | 2 mL | 5 mg/mL |
Both components sit in the same 2 mL, so each has its own strength. This is the same division as the single-compound reconstitution math, done once per component.
Step 2: what a draw contains
Convert the draw to milliliters, then multiply by each concentration. On a U-100 syringe, units ÷ 100 gives milliliters, so 10 units is 0.1 mL.
| Draw | Volume | First component (2.5 mg/mL) | Second component (5 mg/mL) |
|---|---|---|---|
| 5 units | 0.05 mL | 0.125 mg | 0.25 mg |
| 10 units | 0.10 mL | 0.25 mg | 0.5 mg |
| 20 units | 0.20 mL | 0.5 mg | 1 mg |
The second column is always twice the first, because the label ratio was 1:2. Change the draw and both move together.
Step 3: working backward from one component
Protocols often specify a target for one component. Find the volume that delivers it, then read off what that volume carries of the others.
If the target is 0.5 mg of the first component at 2.5 mg/mL, the volume is 0.5 ÷ 2.5 = 0.2 mL, which is 20 units. That draw also carries 0.2 × 5 = 1 mg of the second component. If 1 mg of the second component is not what the protocol intended, no draw from this vial can deliver 0.5 mg of the first without it. That is a property of the blend, and the answer is a conversation with whoever set the protocol, not a different unit count.
The peptide blend calculator does both directions: enter a draw to see each component, or enter a target for one component to see the draw and everything else it carries.
Why adding water cannot fix a ratio
Water lowers every component's concentration by the same factor. Doubling the water halves the first component's concentration and halves the second's. The ratio stays 1:2. The only thing that changes is how many units the same amounts take up on the syringe.
That makes water volume a readability tool, the same as with a single compound. Pick a volume that puts your usual draw on a whole unit mark. The dose math mistakes guide covers that choice.
Three-component and four-component blends
The method does not change. Divide each component's milligrams by the shared water volume to get each concentration. Multiply the draw volume by each concentration to get each amount. A four-component blend has four concentrations and four amounts per draw, all from one division and one multiplication each.
Logging a blend
A labeled blend is one vial, one draw, and one log entry. Record the draw in units and milliliters as you would for any vial, then record each component's amount from the arithmetic above, or note the label ratio so the amounts can be rebuilt later. Name the blend on the vial and in the log by all its components, spelled out, following the Institute for Safe Medication Practices guidance against private abbreviations.
Keep the blend's record separate from any single-compound vial that shares a component. If you also have a vial of the second compound on its own, a dose from the blend and a dose from that vial are two entries pointing at two vials. The multi-compound logging guide covers that structure.
What the arithmetic cannot tell you
- Whether the label is accurate. Your concentrations are only as good as the milligrams stated for each component.
- Whether the components are compatible or stable together. A blend that arrived combined was formulated by someone. Combining separate vials at home is compounding, which USP General Chapter <797> treats as a controlled operation.
- Whether the ratio suits you. A fixed ratio means one component's target sets the others. That is a protocol question.
Vitadel Protocol tracks a blend as one compound with its own vial size, water volume, dose, and schedule. Put the component amounts in the compound's name or notes so each logged draw can be read back as its parts.
FAQ
Sources
About the author. Max Grev is the founder of Vitadel, the company behind Vitadel Run and Vitadel Protocol.
Related guides
- Peptide Reconstitution Math: Vial, BAC Water, and U-100 Units
What reconstitution is, the three numbers that set every draw, and a worked example from a 5 mg vial to 10 units.
- Logging Multiple Compounds Without Mixing Up the Record
Identical unit counts from different vials are the trap. One entry per compound, each pointing at its vial, is the way out.
- Common Peptide Dose Math Mistakes (With Worked Fixes)
The eight errors that happen in practice, each shown wrong, shown right, and paired with the check that catches it.
Track a blend as one vial, one draw
Vitadel Protocol tracks the blend's vial size, water volume, dose, and schedule, and counts remaining doses as you log.
