Peptide calculator

Reconstitution and dosing tools

Two calculators in one: figure out the right bacteriostatic water volume to hit your target concentration, then check the dose against a body-weight-adjusted range with safety guardrails. Use alongside the peptide field reference.

Off-label tool. All peptides here are research compounds or compounded off-label. This calculator maps practitioner consensus, not approved labelling. Confirm with a prescriber and verify third-party testing (HPLC + mass spec) on any peptide you reconstitute.
1. Vial and diluent
Enter the peptide mass printed on the vial. The calculator figures out the water based on your target dose and draw size.
2. Target dose
= 0.20 mg
3. Your reconstitution
Pick how much you want to draw per dose. The calculator figures out the water.
5 units (0.05 mL)
10 units (0.1 mL)
15 units (0.15 mL)
20 units (0.2 mL)
Vial5 mg = 5,000 mcg
Add bacteriostatic water2.50 mL
Concentration2,000 mcg/mL (2 mg/mL)
Draw per dose10 units on 30-unit syringe = 0.10 mL
Dose delivered200 mcg ✓
Doses per vial25 ✓
Dose ladder (all standard target doses for this vial)
Target doseVolume to drawUnitsMarker
1. Patient and application
Body weight anchors dosing for the peptides that have weight-adjusted data. Application adjusts the conservative starting point.
2. Recommended range
Pulled from the field reference. Floor = conservative starting dose. Ceiling = practitioner max for healthy adults. Anything above the ceiling falls into the warn band.
Floor (start)
100 mcg
conservative start
Suggested
200 mcg
experience-adjusted
Ceiling
300 mcg
practitioner max
Per kg (suggested)
2.5 mcg/kg
weight-anchored
These numbers reflect the practitioner consensus from the field reference. They are not approved doses. Start at the floor, escalate only if the floor is well tolerated, and hold below the ceiling in healthy adults.
3. Custom dose check
If you have a specific number in mind, type it and the calculator flags whether it sits in the green, yellow, or red band.
Build a stack
Add up to four peptides for a single protocol. The view shows dose timing overlap and the total weekly injection count.
Reconstitution protocol (general)

Supplies. Bacteriostatic water (0.9% benzyl alcohol), alcohol swabs, insulin syringes (29 to 31 gauge, 0.3 to 1 mL), the lyophilised peptide vial.

Draw-up. Wipe the vial tops with alcohol. Draw the chosen bacteriostatic water volume into the syringe. Inject slowly down the side of the peptide vial, not directly onto the powder. Let the water run down the glass.

Mix. Do not shake. Roll the vial gently between your palms or let it sit for 5 to 10 minutes until the powder dissolves. Swirl if needed. Shaking denatures the peptide.

Storage. Reconstituted peptide keeps 14 to 30 days in the fridge (2 to 8 degrees C). Discard if cloudy or particulate. For peptides that lose potency fast (PT-141, selank, semax), use within 14 days.

Injection sites. Subcutaneous: abdomen (2 inches from the navel), thigh, upper glute, or the back of the upper arm. Rotate sites. For local injury work, inject as close to the target tissue as the anatomy allows.