How much bac water should I use?

Use 2mL of bacteriostatic water for every vial in the table on this page. One volume for every compound removes the failure where a remembered volume from one vial gets applied to another. The volume sets the concentration, which sets how many units one dose becomes. The math stays consistent because figures are reported in units, not mL.

Why units instead of mL?

A U-100 insulin syringe is calibrated in units (100 units = 1mL). Drawing 0.1mL on a small barrel is hard to read accurately. Drawing 10 units is unambiguous because the unit ticks are clearly visible. Switching the dose language from mL to units removes the most common source of accidental 10x overdoses: misreading a decimal place.

What if I draw a different bac water volume than recommended?

The math still works, you just get a different concentration. Less bac water means each unit delivers more peptide (so fewer units per dose). More bac water means each unit delivers less (so more units per dose). The calculator on this page recomputes the unit count for any bac water volume you enter.

Can I shake the vial to dissolve faster?

No. Shaking foams the solution and can denature the peptide, especially with fragile compounds like BPC-157, CJC-1295, and Ipamorelin. Roll the vial gently between your palms or swirl it on a flat surface. Full dissolution should take 30 to 60 seconds.

Why is my peptide cloudy after reconstitution?

A correctly reconstituted vial turns clear within about 30 to 60 seconds of gentle swirling. Short-lived cloudiness usually means the powder has not fully dissolved yet, or that shaking whipped foam and micro-bubbles into the solution, both of which settle out on their own. Persistent haze, floating particles, or a solution that will not go clear is a reason to stop and not use that vial.

How long does reconstituted peptide last?

Pre-reconstitution: lyophilized powder is stable at room temperature for weeks and in a freezer for many months. Post-reconstitution: refrigerate immediately at 2 to 8 Celsius and use within 30 days for most peptides. Some peptides (TB-500, BPC-157) hold for slightly longer; others (Tesamorelin) degrade faster. The per-compound pages carry the per-peptide shelf life.

What if my syringe only goes up to 40 or 50 units?

You probably have a U-40 syringe or a half-cc U-100 syringe. Half-cc U-100 syringes hold 50 units and are fine for most volumes (the units math is identical). U-40 syringes are a different scale entirely and will read incorrectly unless converted. Every figure on this site is reported on the U-100 scale.

Do you include bac water?

Your kit includes the vials and bacteriostatic water. Insulin syringes ship with your order to select delivery regions; where they can't ship, we send a same-day sourcing link. A printed reference guide ships with every order. We confirm exactly what is included with your order.

What is the safest way to learn reconstitution technique?

Reconstitution is arithmetic on concentration plus sterile technique. The calculator on this page does the math and reports the result in units rather than mL, which is the reading that cannot be misread by a factor of ten. The team is on WhatsApp for questions about the vial, the volume and storage. Anything about administration belongs with a licensed physician.

Reconstitution

How to Reconstitute Peptides: Units, Math, Step-by-Step

Every peptide vial ships as a freeze-dried powder. Before the first dose you mix it with bacteriostatic water, a process called reconstitution. The math is simple, but the wrong unit (mL versus units on the syringe) is the most common source of 10x overdoses in self-administered protocols.

The short answer

To reconstitute a peptide, wipe both rubber stoppers with alcohol, then inject bacteriostatic water slowly down the inner wall of the freeze-dried vial and swirl gently until the liquid runs clear, never shake it. Then work in insulin-syringe units, not mL: the calculator on this page turns your vial size, bac water volume and target amount into a unit count, so there is no decimal place to misread.

Why units, not mL

Published research figures are reported on this site in insulin-syringe units, never in mL. Reading a decimal place wrong on a small syringe barrel can mean a 10x overdose. Reading the wrong tick mark cannot. The only mL number on this page is the bac water input volume.

The 4-step method

Total time: about 5 minutes. Reusable across every peptide in the Peptara catalog.

Wipe vial top with alcohol
Wipe the rubber stopper of both the peptide vial and the bacteriostatic water vial with a fresh alcohol swab. Let each surface air-dry for a few seconds. This is the single biggest contamination guard in the whole process.
Draw bac water with syringe
Pull the plunger of a U-100 insulin syringe to the bac water volume you have planned for this vial (the recommended volume table below has presets for every Peptara SKU). Insert the needle into the bac water vial and draw cleanly.
Inject slowly down the side of the vial wall
Push the needle into the peptide vial at an angle so the bac water runs down the inner glass wall, not directly onto the lyophilized powder. A slow stream protects fragile peptide bonds and keeps the solution clear.
Swirl gently, do not shake
Roll the vial between your palms or swirl it on a flat surface until the powder is fully dissolved. Shaking creates foam and can fragment the peptide. The solution should look clear within 30 to 60 seconds.

Reconstitution math (units, not mL)

One universal formula handles every peptide in the catalog.

The formula

units = (desired dose in mg / vial strength in mg) × (bac water in mL × 100)

A U-100 insulin syringe holds 100 units per 1mL. So 1mL of reconstituted solution equals 100 units. If you put 10mg of peptide into 1mL of bac water, each unit delivers 0.1mg (100mcg).

Worked examples

Retatrutide
20mg vial, 2mL bac water, 5mg target dose. (5 / 20) × (2 × 100) = 50 units per injection.
Tirzepatide
20mg vial, 2mL bac water, 5mg target dose. Same math as Retatrutide: 50 units per injection.
BPC-157
20mg vial, 2mL bac water, 250mcg (0.25mg) target dose. (0.25 / 20) × 200 = 2.5 units, round up to 3 units per injection.

Calculator

Pick a vial from the Peptara catalog (or enter a custom strength), set your bac water volume, and enter your desired dose. The calculator returns the unit count and shows where to draw on a U-100 insulin syringe. If you are working from a vial that is not in our catalog, the standalone peptide reconstitution calculator takes any vial strength and volume and prints its working.

Educational reference, not a prescription and not a personal dose. This tool converts a concentration into syringe units so you can check the math. It does not set a dose or tell you how to inject. A licensed clinician sets any dose and administration.

Vial strengthBac water (mL, input only)Desired dose

Equivalent on a U-100 syringe

50units

At this concentration, 5 mg corresponds to about 50 units on a standard U-100 insulin syringe. This is a math reference, not a dose or an instruction.

Recommended bac water volumes

Default reconstitution presets for every Peptara Labs SKU. The example amounts are round figures picked to make the unit arithmetic easy to follow, not a recommendation for any vial, any compound or any person. A licensed clinician sets any dose.

Peptide reconstitution chart

Read this peptide reconstitution chart as a math illustration only: each row shows how a vial size and a 2mL bac water fill convert an example amount into syringe units. It is not a dose for anyone, and nothing here picks one.

Peptide	Vial size	Bac water	Example amount (not a recommendation)	Units per example amount
Retatrutide	20mg	2mL	5mg	50 units
Tirzepatide	20mg	2mL	5mg	50 units
BPC-157	20mg	2mL	250mcg	3 units
CJC-1295 / Ipamorelin	10mg	2mL	250mcg	5 units
GHK-Cu	100mg	2mL	2mg	4 units, draw slowly: at 50mg/mL a single unit is 0.5mg
TB-500	10mg	2mL	2.5mg	50 units
MT-2 (Melanotan-2)	10mg	2mL	0.5mg	10 units
Semax	10mg	2mL	600mcg	12 units
Selank	10mg	2mL	600mcg	12 units
KLOW Combo	80mg	2mL	4mg	10 units
MOTS-c	40mg	2mL	5mg	25 units (matches JP protocol Section 06)
Epithalon	50mg	2mL	1mg	4 units, draw slowly: at 25mg/mL a single unit is 0.25mg
Tesamorelin	20mg	2mL	2mg	20 units
SLU-PP-332	5mg	2mL	1mg	40 units
PT-141 (Bremelanotide)	10mg	2mL	1.5mg	30 units
Glutathione	600mg	2mL	200mg	67 units at 300mg/mL, drawn across one syringe

Figures shown for math illustration only. They are not a dose for anyone, and nothing on this page picks one.

Storage

Before reconstitution

Stable at room temperature

Lyophilized peptide powder is stable at room temperature for weeks and in a freezer for many months. Keep the vial sealed and out of direct sunlight until the day you reconstitute.

After reconstitution

Refrigerate immediately

Once mixed with bac water, store the vial at 2 to 8 Celsius. 30-day shelf life is the safe default for most peptides. The per-compound pages carry the per-peptide detail.

Travel

Reconstituted vials travel with an ice pack in carry-on. Lyophilized vials handle cabin temperature without ice. Country-specific customs rules vary, see the FAQ for travel guidance.

Frequently asked questions

Peptide pages

Retatrutide

Triple-agonist GLP-1 / GIP / glucagon. Studied in clinical trials for weight loss.

View page

Tirzepatide

Dual-agonist GLP-1 / GIP. Studied in clinical trials for weight loss.

View page

BPC-157

Body Protection Compound for tissue repair, gut healing, recovery.

View page

Compound-specific guides

How to reconstitute retatrutide

The 20mg vial start to finish, what bac water is, how much to add, and the units math worked out at 1 mL, 2 mL and 3 mL.

Read the guide

Full FAQ About Peptara Labs

Order with reconstitution math built in

The concentration math for every vial we sell, worked out on this page, in units rather than mL.

Every Peptara Labs order includes bac water sized to the vial, a printed reference, and support on WhatsApp for the vial, the volume and storage.

Chat on WhatsApp Browse all 19 peptides →

How to Reconstitute Peptides: Units, Math, Step-by-Step

The 4-step method

Wipe vial top with alcohol

Draw bac water with syringe

Inject slowly down the side of the vial wall

Swirl gently, do not shake

Reconstitution math (units, not mL)

Worked examples

Calculator

Recommended bac water volumes

Peptide reconstitution chart

Storage

Frequently asked questions

Peptide pages

Compound-specific guides

The concentration math for every vial we sell, worked out on this page, in units rather than mL.