BAC water vs sterile water, concentration math, sterile technique, and storage — the complete protocol.
Lyophilized peptides ship as a dry powder because that's the most stable form for long-distance transport and storage. Before any research protocol can begin, the powder needs to be reconstituted into a liquid solution. The process is straightforward, but small errors in dilution math or sterile technique can affect your results significantly.
This breakdown covers the full process: what reconstitution liquid to use, how to calculate your target concentration, sterile handling procedure, and proper storage once the vial is prepared.
Two options are used in peptide research: bacteriostatic water (BAC water) and sterile water for injection (SWFI).
Bacteriostatic water contains 0.9% benzyl alcohol, which inhibits bacterial growth in the solution. This preservative extends the usable life of a reconstituted vial to approximately 28-30 days when refrigerated. For most research protocols that span multiple weeks, BAC water is the appropriate choice.
Sterile water for injection contains no preservative. A vial reconstituted with SWFI should typically be used within 24 hours. It's appropriate when a single-use application is the plan or when a particular protocol specifies avoiding benzyl alcohol.
BAC water is the standard choice for the majority of research peptide work. All Lumé compounds are lyophilized and compatible with BAC water reconstitution.
Before you reconstitute, decide what concentration you want. Concentration is typically expressed in micrograms per milliliter (mcg/mL). The math is simple:
Concentration (mcg/mL) = Total peptide mass (mcg) ÷ Volume of BAC water added (mL)
If you have a 10mg vial (10,000 mcg) and add 2mL of BAC water, your concentration is 5,000 mcg/mL (5 mg/mL). If you add 1mL, the concentration is 10,000 mcg/mL. Adding more liquid gives you a more dilute solution with smaller draw volumes per dose. Adding less gives a more concentrated solution with larger doses per unit volume drawn.
The Lumé reconstitution calculator on the main site handles this math automatically once you enter your peptide amount, water volume, and desired dose. It outputs the exact volume to draw in syringe units (U-100), which is what most research syringes measure.
You'll need the peptide vial, BAC water vial, a 1mL syringe with a sterile needle, alcohol prep swabs, and a clean surface. Work in as clean an environment as possible.
Wipe the rubber stopper on both the peptide vial and the BAC water vial with a fresh alcohol swab. Allow them to dry for 10-15 seconds before proceeding. Don't blow on them to speed drying.
Insert the needle into the BAC water vial and draw up your target volume. If you're adding 2mL to the peptide vial, draw 2mL now. Keep the syringe sterile, meaning no contact between the needle and any non-sterile surface.
Insert the needle into the peptide vial at an angle and release the BAC water gently along the side of the glass, not directly onto the powder. Direct pressure on the powder can disrupt the peptide structure. Let the water run down the side and pool at the bottom. Do not inject air forcefully into the vial.
Remove the needle and gently swirl the vial in a circular motion until the powder dissolves completely. This typically takes 10-30 seconds. Most peptides dissolve fully; if the solution appears cloudy after extended swirling, check your reconstitution liquid temperature (room temperature BAC water works better than refrigerator-cold). Never shake or vortex the vial. Mechanical agitation can break peptide bonds and degrade the compound.
The reconstituted solution should be clear and colorless (some peptides have a slight yellowish tint, which is normal). Any visible particles may indicate incomplete dissolution or contamination. Label the vial with the compound name, concentration, date of reconstitution, and your initials or protocol ID.
Store reconstituted peptides in the refrigerator at 2-8°C. Keep them away from light (the original vial box works well for this). Avoid placing them near the freezer section of the refrigerator where temperature fluctuations are greater.
Do not freeze reconstituted peptides. Freeze-thaw cycles degrade the solution and can cause aggregation.
Lyophilized peptides that haven't yet been reconstituted can be stored at room temperature away from heat and light for months to years depending on the compound. Once reconstituted, the general guideline is 28-30 days in BAC water under proper refrigeration — but this varies significantly by compound.
Compounds with documented extended solution stability: GLP-3 Reta and GHK-Cu are notably more stable in reconstituted form than most peptides. GLP-3 Reta's triple receptor agonist structure is resistant to the enzymatic degradation that affects simpler peptides, which is why the 24mg and 60mg vials are practical for extended research protocols spanning 2-4 months without significant loss of potency. GHK-Cu, as a copper-chelated tripeptide, benefits from the copper's stabilizing effect on the peptide bond in solution. Research protocols using either compound routinely extend beyond the standard 30-day window when vials are stored correctly and handled with minimal freeze-thaw cycles.
For peptides like BPC-157, Ipamorelin, CJC-1295, and most other compounds in the Lumé catalog, the 28-30 day guideline in BAC water reflects standard research practice. When in doubt on any specific compound, contact support@lumepeptides.com for protocol guidance.
The quality of your source material matters, but so does how you handle it. A 99%+ purity compound stored and reconstituted incorrectly won't perform in research the way it should. Sterile technique and cold storage aren't optional steps.
All products on this site are for research and development use only. Products are not for human consumption of any kind. The statements made on this website have not been evaluated by the US Food and Drug Administration. These statements and products are not intended to diagnose, treat, cure, or prevent any disease. Lumé Longevity LLC is a chemical supplier and is not a compounding pharmacy or chemical compounding facility as defined under 503A of the Federal Food, Drug, and Cosmetic Act. Not an outsourcing facility as defined under 503B. All products are sold for research, laboratory, or analytical purposes only.