Question 1

How do I reconstitute a peptide vial?

Accepted Answer

Draw bacteriostatic water (BAC water) into an insulin syringe, then inject it slowly into the lyophilized peptide vial. Let the water run down the side of the vial — do not spray directly onto the powder. Gently swirl until dissolved. Never shake the vial.

Question 2

How much bacteriostatic water should I add?

Accepted Answer

The amount of BAC water determines your concentration. Common choices are 1–3 mL. More water = lower concentration = larger injection volumes. Less water = higher concentration = smaller, more precise injections. Use our calculator above to find the exact volumes.

Question 3

What syringe should I use for peptide injections?

Accepted Answer

Most peptide users use U-100 insulin syringes (100 units = 1 mL). For doses under 30 units, a 0.3 mL (30-unit) syringe provides better precision. For larger volumes, use a 1 mL (100-unit) syringe.

Question 4

How long does a reconstituted peptide last?

Accepted Answer

Reconstituted peptides should be refrigerated (2–8°C) and typically last 3–4 weeks when using bacteriostatic water. With sterile water (no preservative), use within 48 hours. Never freeze reconstituted peptides.

Question 5

What is the difference between mcg, mg, and IU?

Accepted Answer

1 mg = 1,000 mcg (micrograms). Most peptides are dosed in mcg. IU (International Units) are used for some hormones like HGH and insulin, where the conversion depends on the specific compound.

Peptide Reconstitution Calculator

Step 1 · Gather your supplies

Step 2 · Add bacteriostatic water

Step 3 · Calculate and draw your dose

How do I reconstitute a peptide vial?

How much bacteriostatic water should I add?

What syringe should I use for peptide injections?

How long does a reconstituted peptide last?

What is the difference between mcg, mg, and IU?