How to reconstitute a peptide.

Bac water in. Swirl, don't shake. Insulin syringe. Math goes here.

Most peptides ship as a lyophilized powder in a sealed glass vial. You add ("bac water"), let it dissolve, draw the dose into an .

Math first

A 5mg vial + 1mL = 5,000 mcg/mL. A 250 mcg dose = 0.05 mL = 5 units on a U-100 insulin syringe. Write this on the box with a sharpie before you put it down. Don't trust your future 11pm self to do the math again. Or just use [our calculator](/reconstitute) — it does this for any peptide, any vial, any syringe.

Technique

Wipe both rubber stoppers with alcohol. Pull into the syringe. Inject the bac water down the *side* of the vial. Don't shoot it directly at the powder. Roll the vial gently between your palms until the powder dissolves. Don't shake. Shaking can denature the peptide.

Storage after recon

Refrigerate at 2–8°C. Use within 30 days. After 30 days the no longer guarantees sterility.

More reading: Open the recon calculator · How to dose (trial-suggested) · How to inject subq · How to store.