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Peptide reconstitution cheat sheet.

Bac water math, concentration tables, syringe unit conversions, and storage guidance. Built for the in vitro research bench. Save it, print it, hang it next to your fridge.

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Equipment you need.

1× lyophilized peptide vial (research compound)
1× bacteriostatic water (USP-grade, 0.9% benzyl alcohol)
1× insulin syringe, U-100, 1 mL or 0.5 mL
Alcohol pads
Sharps container

For research and laboratory use only. Aseptic technique throughout.

The math, in 30 seconds.

Concentration (mg/mL) = total peptide (mg) ÷ bac water added (mL).

Units to draw on a U-100 syringe = (target dose mg ÷ concentration mg/mL) × 100.

Example. 5 mg vial + 2 mL bac water = 2.5 mg/mL. For a 250 mcg (0.25 mg) target dose, draw 0.25 / 2.5 = 0.1 mL = 10 units on a U-100 syringe.

Bac water reference table.

Common reconstitution volumes for typical research vial sizes. All values produce simple unit-math.

Vial size	Bac water	Concentration	Doses per vial (250 mcg)
5 mg	1 mL	5 mg/mL	20
5 mg	2 mL	2.5 mg/mL	20
10 mg	2 mL	5 mg/mL	40
10 mg	3 mL	3.33 mg/mL	40
10 mg	5 mL	2 mg/mL	40
15 mg	3 mL	5 mg/mL	60

Total doses per vial scale with vial size, not water volume. More water just makes each dose larger in volume on the syringe.

Reconstitution, step by step.

Wipe both stoppers (peptide vial + bac water vial) with alcohol pads. Let dry.
Draw bac water into the syringe. Pull air first equal to the volume you'll add, push it into the bac water vial, then withdraw the desired mL.
Inject bac water down the side wall of the peptide vial. Do not jet directly onto the lyophilized powder, foaming wastes peptide.
Swirl gently until fully dissolved. Do not shake. Most peptides dissolve in under a minute.
Visually inspect. Solution should be clear. Cloudy or particulate = stop, contact the supplier.
Label the vial with reconstitution date and concentration. Store at 2 to 8 °C.

Syringe unit conversion.

All values assume a U-100 insulin syringe. Match the concentration column to the dose row.

Target dose	2.5 mg/mL	3.33 mg/mL	5 mg/mL
100 mcg	4 units	3 units	2 units
200 mcg	8 units	6 units	4 units
250 mcg	10 units	7.5 units	5 units
300 mcg	12 units	9 units	6 units
500 mcg	20 units	15 units	10 units
1 mg	40 units	30 units	20 units
2 mg	80 units	60 units	40 units

Storage.

Lyophilized (sealed): room temperature, dark, dry, up to 24 months. Refrigerator if you have the space.
Reconstituted: 2 to 8 °C (refrigerator), up to 28 days for most peptides. KLOW and other blends, 14 days.
Avoid: direct light, freeze-thaw cycles, and the freezer (degrades most peptides over time).
Travel: insulated cool pack with reconstituted vials. Do not leave in a hot car.

Common mistakes.

Shaking the vial. Foam = lost peptide. Swirl, do not shake.
Skipping the alcohol wipe. Contamination = wasted batch.
Using sterile water instead of bac water. No preservative means 24 hours, not 28 days.
Not labeling the vial. Day 30 you will not remember the concentration. Always write it down.
Pulling from the same hole each time. Rotate the stopper or you will core rubber into your solution.

If something goes wrong.

Cloudy solution after reconstitution: stop, do not use, contact the supplier.
Crystals forming after refrigeration: let warm to room temperature, swirl. If they do not redissolve, do not use.
Vial cracks or stopper compromised: discard. NLL replaces compromised vials free, email nextlevellabs01@gmail.com with a photo and your order number.

Important. All values and procedures listed are for in vitro research and laboratory use only. Not for human consumption. Not evaluated by the FDA. Not intended to diagnose, treat, cure, or prevent any condition. Always conduct research under qualified supervision.

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