NOT MEDICAL ADVICE. No information on this site should be considered medical advice. Research peptides are not intended for human consumption — in-vitro lab use only. Consult a physician prior to introducing anything into the human body.
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Reconstitution Guide

Lyophilized (freeze-dried) peptides arrive as a powder cake. Reconstitution is the process of returning them to solution for dosing — and it is where most handling errors happen.

What you need

  • Lyophilized peptide vial (peptide powder cake)
  • Solvent of choice — bacteriostatic water (BAC) for multi-use, sterile water for immediate single use (see BAC vs Sterile Water)
  • Alcohol prep pads, 1 mL insulin syringes, and a clean workspace

Step-by-step

  1. Sanitize. Wipe the vial stopper with an alcohol pad and let it dry. Wash hands.
  2. Draw solvent. Draw the desired volume of BAC into a syringe (see the calculator for volumes).
  3. Inject slowly. Insert the needle through the center of the stopper at a slight angle. Inject the solvent slowly, down the inside wall of the vial — never directly onto the peptide cake.
  4. Roll, don't shake. Gently swirl or roll the vial. Shaking creates bubbles and shear stress that can degrade fragile peptides.
  5. Let it settle. If the cake hasn't fully dissolved, let the vial sit for a few minutes. Some peptides (e.g. GHK-Cu) dissolve slower or leave a slight hue — that's normal.
  6. Refrigerate. Store reconstituted peptide in the fridge. See Storage & Handling for timelines.

Common mistakes

Injecting solvent directly onto the peptide cake. This is the #1 cause of degradation complaints — it can denature the peptide before it ever leaves the vial.
  • Over-diluting: huge volumes make doses awkwardly large. 1–2 mL per 5 mg vial is typical.
  • Under-diluting: 0.5 mL into a 10 mg vial gives a concentration that is hard to dose precisely and can be painful to inject.
  • Using the wrong solvent: sterile water has no preservative; anything drawn from that vial after the first puncture is a contamination risk.
  • Skipping alcohol prep: the stopper is not sterile. Wipe it.

Solvent choice in one line

Multi-dose vial, dosing over days/weeks → bacteriostatic water. Single preparation, immediate use → sterile water is acceptable. Anything else is a trade-off you should make consciously.

Use the Reconstitution Calculator to convert your vial size, solvent volume and dose into syringe units.