Peptide Usage Guide

What reconstitution is

What you need

• The vial — the lyophilized powder, with its labeled amount in milligrams (mg).
• Bacteriostatic water — sterile water containing a preservative (typically 0.9% benzyl alcohol), which lets a multi-use vial be re-entered over days without bacterial growth.
• A U-100 insulin syringe — graduated in “units” (1 unit = 0.01 mL), which is what you'll draw the reconstituted liquid with.
• Alcohol swabs — to wipe both vial stoppers before every needle entry.
• (Optional) a separate larger syringe/needle — some people use one syringe to add the water and the insulin syringe only for drawing doses.

Key concepts

Bacteriostatic vs. sterile water

Plain sterile water and sterile saline have no preservative, so they suit single-use only. Bacteriostatic water's benzyl alcohol is what makes a vial that's entered repeatedly over time the common choice for reconstitution.

What a “unit” is

On a U-100 insulin syringe, the scale is in units, not milligrams. One unit is always 0.01 mL of liquid, whatever the syringe's total size. The syringe measures volume — it has no idea how concentrated your liquid is.

Concentration is the link

Concentration (mg per mL) = peptide in the vial ÷ water added. More water → lower concentration → more units per dose (and finer adjustment); less water → higher concentration → fewer units per dose. The peptide amount per dose doesn't change — only how many units of liquid carry it.

Step by step

1. 1Let the vial and water reach room temperature, and wash your hands. Wipe both rubber stoppers with a fresh alcohol swab.
2. 2Draw your planned volume of bacteriostatic water into the syringe.
3. 3Insert the needle into the peptide vial and add the water slowly, aiming the stream down the inside wall of the vial — not directly onto the powder.
4. 4Remove the needle and swirl gently until fully dissolved. Do not shake — agitation can denature or aggregate fragile peptides and create foam.
5. 5Let it sit until the solution is completely clear with no visible particles before drawing any dose.
6. 6Label the vial with the contents and the date, and store it (see below).

Storage & handling

• Store per the product's guidance — reconstituted vials are commonly refrigerated (about 2–8°C). Protect from light, and don't freeze unless a source specifically indicates it.
• Reconstituted peptides have a much shorter usable life than the dry powder. Approved products vary (often a couple of weeks), and unregulated research compounds have no established shelf life — follow the product's guidance and, when in doubt, discard.
• Always label with the date of reconstitution so you can track it.
• Lyophilized (un-mixed) powder is far more stable and is usually stored cold and dark until use.

Sterility & safety

• Swab the stopper every time before inserting a needle.
• Use a new, sterile needle each time; never reuse or share needles or vials.
• Discard the vial if the solution turns cloudy, changes color, or shows particles or growth.
• Dispose of needles in a proper sharps container.

Common mistakes

• Shaking instead of swirling — can denature or aggregate the peptide and foam the solution.
• Using the wrong water (tap, non-sterile, or expecting plain sterile water to keep a multi-use vial).
• Confusing units and milligrams — the syringe reads volume in units; the calculator converts your dose to units.
• Squirting water directly onto the powder forcefully, rather than running it down the wall.
• Assuming a different water volume gives the same units — change the water, and the units-per-dose change too.