TL;DR — Reconstituting a lyophilised research peptide correctly means: pick the right diluent (bacteriostatic water with 0.9% benzyl alcohol), use the right volume based on your concentration maths, inject slowly down the inner vial wall, swirl gently (never shake), and store at 2–8°C. This guide walks through every step. All B.A.B.E LABS research peptides — including WOLVERINE, HULK, SHRED, BRONZED, and THRILL PILL — are supplied lyophilised and require reconstitution before in-vitro or laboratory research use.
What you need:
1. The lyophilised peptide vial (the research compound from B.A.B.E LABS)
2. Bacteriostatic water — sterile water containing 0.9% benzyl alcohol as a preservative. BAC WATER.
3. An appropriately-sized syringe — typically an insulin syringe (1ml, U-100) for small-volume research work
4. Alcohol swabs for vial-top disinfection
5. A clean, stable workspace
Why bacteriostatic water, not regular sterile water?
Sterile water for injection is a single-use diluent — once a vial is opened, it's considered non-sterile for subsequent withdrawals.
Bacteriostatic water contains 0.9% benzyl alcohol, a preservative that prevents microbial growth between multiple withdrawals. This lets researchers use the same reconstituted peptide vial across a sequence of experimental timepoints — standard practice for multi-day in-vitro work.
Step-by-step method
Step 1 — Clean
Wipe the rubber tops of both vials (peptide and bacteriostatic water) with alcohol swabs. Let them air-dry.
Step 2 — Calculate your reconstitution volume
Decide what concentration you want in the final reconstituted vial. The formula:
> Volume of BAC water to add (ml) = Peptide mass (mg) ÷ Target concentration (mg/ml)
Worked examples for a 10mg peptide vial:
- Want 1 mg/ml → add 10 ml BAC water (rare — most researchers work at higher concentrations)
- Want 2 mg/ml → add 5 ml BAC water
- Want 5 mg/ml → add 2 ml BAC water
- Want 10 mg/ml → add 1 ml BAC water
Pick a concentration that makes your downstream dosing maths easy on a U-100 insulin syringe (where 100 units = 1ml).
Step 3 — Draw the BAC water
Insert the syringe into the BAC water vial and draw the volume calculated in Step 2.
Step 4 — Transfer slowly
Insert the needle into the peptide vial at an angle. Inject the BAC water slowly, down the inner wall of the vial. Do not squirt directly onto the lyophilised peptide powder — this shears the peptide.
Step 5 — Dissolve
Once all BAC water is in, swirl gently for 10–20 seconds. Do not shake. Shaking creates foam and introduces shear forces that can break peptide bonds. The peptide should dissolve into a clear, colourless solution within a minute or two.
If the peptide hasn't dissolved after gentle swirling, leave the vial at room temperature for 5–10 minutes and swirl again. Cloudy or discoloured solutions indicate a problem — do not use.
Step 6 — Label and store
Label the vial with:
- Peptide name
- Concentration (mg/ml)
- Reconstitution date
- Recommended use-by date (per COA)
Store at 2–8°C (refrigerator). Keep upright, protected from light.
Storage rules:
| State | Temperature | Typical duration |
| Lyophilised (unreconstituted) | –20°C or colder, light-protected | 24+ months |
| Reconstituted with BAC water | 2–8°C (refrigerator) | Per COA (typically 4–6 weeks for stable peptides) |
| Room temperature | Avoid after reconstitution | Hours only for immediate use |
Avoid freeze–thaw cycles on reconstituted peptides. Each cycle accelerates degradation.
Common mistakes to avoid:
1. Using regular sterile water — single-use only; microbial contamination risk on subsequent withdrawals
2. Injecting BAC water forcefully onto the powder — causes peptide shear
3. Shaking the vial to dissolve — creates foam and shear stress
4. Leaving reconstituted vial at room temperature — accelerates degradation
5. Using a reconstituted vial past the COA-stated window — purity and activity drop
6. Not labelling the vial — you will forget, and stale peptides ruin experiments
Concentration reference table (10mg vial)
| BAC water added | Final concentration | Volume per 1mg dose |
| 1 ml | 10 mg/ml | 0.1 ml (10 units U-100) |
| 2 ml | 5 mg/ml | 0.2 ml (20 units U-100) |
| 2.5 ml | 4 mg/ml | 0.25 ml (25 units U-100) |
| 5 ml | 2 mg/ml | 0.5 ml (50 units U-100) |
For 20mg and 30mg vial sizes (e.g., Shred 20mg/30mg), scale BAC water proportionally to maintain your desired concentration.
Research-use disclaimer:
This guide is provided for researchers working with B.A.B.E LABS research compounds in in-vitro and laboratory research only. Our peptides are not approved by the TGA for human therapeutic use and are not supplied for human consumption.
FAQs:
Can I use normal saline instead of bacteriostatic water?
For single-session in-vitro work, sterile saline is acceptable. For multi-withdrawal storage over days or weeks, BAC water is the standard because of its preservative action.
The powder doesn't fully dissolve — what's wrong?
Either insufficient BAC water volume (peptide saturated), too-rapid injection (peptide shear), or a quality issue. Try adding another 0.5–1 ml BAC water and swirling gently. If still not clear, contact the supplier with batch details and COA.
Can I reconstitute with more BAC water than the vial can hold?
Watch the vial's labelled capacity. Most 10mg peptide vials can hold up to 3–5ml comfortably. Splitting a vial into two smaller pre-aliquoted vials is an option for large-volume reconstitutions, but requires sterile technique.
Why not just dissolve in PBS or cell culture media directly?
For immediate use in cell culture, direct reconstitution in buffer is fine and sometimes preferred. BAC water is the standard for storage-between-uses.