How to Reconstitute Reta 20mg: Step-by-Step With Dose Math

Dosing Guide — 2026-10-04

Reconstituting a Reta 20mg vial follows the same method as a 10mg vial, with one adjustment: because the vial holds twice the peptide, you add twice the bacteriostatic water to keep your syringe-unit math simple. Here is the full step-by-step and the dose table for a 20mg vial. For laboratory research use only.

Platinum Biolabs ships every Reta 20mg vial with a batch-matched COA at 99%+ HPLC purity. Code PLATINUM25 takes 25% off your order at checkout.

What You Need

• Your Reta 20mg vial (lyophilized powder)
• Bacteriostatic water (preservative enables multi-use over several weeks)
• A sterile transfer syringe and a U-100 insulin syringe for dosing
• Alcohol wipes

Step-by-Step

1. Bring the vial to room temperature and wipe the stopper with alcohol.
2. Draw your chosen volume of bacteriostatic water (see table) into the transfer syringe.
3. Inject the water slowly against the inside wall of the vial — never directly onto the powder cake.
4. Do not shake. Swirl gently or let it stand until the solution is clear.
5. Label and refrigerate.

How Much Water to Add

For a 20mg vial, doubling the water you would use on a 10mg vial keeps per-dose syringe units identical (U-100 syringe: 100 units = 1 mL):

4 mL is a popular choice: it gives 5 mg/mL — the same concentration many researchers use for a 10mg vial reconstituted with 2 mL — so the dosing feels familiar while the vial lasts twice as long.

Quick Worked Example

Reconstitute the 20mg vial with 4 mL of bacteriostatic water → 5 mg/mL. A 2 mg research dose = 0.4 mL = 40 units on a U-100 syringe; a 4 mg dose = 80 units. See the Reta 20mg dosage guide for how this fits a titration schedule.

A Note on Volume

With 4 mL in the vial you are drawing larger per-dose volumes than a 10mg vial — make sure your chosen amount still fits comfortably in a single U-100 syringe draw. If you want smaller injection volumes, use 2 mL (10 mg/mL) instead and halve the units.

Storage After Reconstitution

• Refrigerate at 2–8°C, capped and out of light
• Stable for several weeks in bacteriostatic water; no freeze-thaw cycling
• See the peptide storage guide

Bottom Line

Reconstitute a Reta 20mg vial exactly like a 10mg vial but with double the water (4 mL for 5 mg/mL) so your syringe units match and the vial yields twice the doses. Add water down the wall, swirl, refrigerate.

Code PLATINUM25 takes 25% off at checkout. Every vial ships with a batch-matched COA at 99%+ HPLC purity.

Disclaimer: All information presented in this article is for educational and informational purposes only. Platinum Biolabs does not promote or endorse the use of peptides for human consumption. All products sold by Platinum Biolabs are intended strictly for laboratory and research use only. Consult a qualified healthcare professional before making any health-related decisions.