Blending Calculator
Stack 2 or more reconstituted peptides into a single injection. The calculator works out the volume contribution from each vial and the total draw on your syringe.
How blending works
A blend is a sequential draw - each peptide stays in its own vial, you draw from each into the same syringe.
Why each peptide stays in its own vial
Mixing dry peptides into a single shared vial sounds tidy but breaks dose control. Different peptides have different shelf lives, ideal pH ranges, and stability characteristics. Combining them into one solution makes it impossible to adjust one dose without touching the others, and any precipitation will affect everything in the vial.
The standard approach: reconstitute each peptide separately, then draw the calculated volume of each into the same syringe just before injection. This calculator works out those individual volumes for you.
The arithmetic
For each peptide: volume = dose × BAC water ÷ vial strength. Add the per-peptide volumes together to get your total draw.
Example: a 5 mg peptide reconstituted with 2 mL BAC, dosed at 250 mcg, needs 0.10 mL. A second 10 mg peptide in another 2 mL vial dosed at 1 mg needs 0.20 mL. Total syringe draw: 0.30 mL = 30 units.
Order of draw matters
Draw the largest volume first to minimise plunger travel between vials. Insert the needle, withdraw, then move to the next vial without expelling. Air-prime once at the start; do not push air into each vial repeatedly.
Sub-cutaneous volume limits
The practical sub-cutaneous tolerance for a single injection site is around 1 mL. Above that, split between sites or thin the blend by using a higher BAC volume per vial. The calculator will warn you if your total draw exceeds your chosen syringe.