Is this a peptide dosage calculator?

No. It runs reconstitution and syringe-unit math for laboratory research — the concentration (mg/mL) of a mixed vial and the equivalent units on a U-100 syringe scale. It does not recommend how much of any compound to use, for a person or an animal. If you searched 'dosage calculator,' the reconstitution math above is almost certainly what you need: turning a vial size and a water volume into a concentration and a syringe mark.

How much bacteriostatic water do I add to a peptide vial?

There is no single fixed amount — the volume you add sets the concentration, so pick a volume that makes your draw easy to measure. Common choices: 2 mL into a 5 mg vial gives 2.5 mg/mL, and 2 mL into a 10 mg vial gives 5 mg/mL. More water means a lower concentration and more units per draw (easier to measure but a fuller syringe); less water means a higher concentration and fewer units. Use the calculator above to test any combination.

How do I read units on a U-100 syringe scale for peptides?

A standard U-100 syringe scale is marked in units where 100 units = 1 mL, so 1 unit = 0.01 mL. To find your draw, multiply your volume per draw in mL by 100. For example, 0.05 mL = 5 units, and 0.10 mL = 10 units. The 'units' and 'IU' markings on the barrel refer to the same lines; 1 cc = 1 mL exactly.

How long does reconstituted peptide last, and how should it be stored?

Once mixed with bacteriostatic water, most peptides are stable for about 28 days when refrigerated at 2-8°C (36-46°F) and kept out of light. The 0.9% benzyl alcohol in BAC water acts as a preservative. Do not freeze a reconstituted vial, and discard it if the solution turns cloudy or discolored. Lyophilized (un-mixed) peptide powder keeps far longer — months to years frozen at -20°C. These handling ranges follow standard peptide manufacturer storage guidance (e.g., Bachem and Sigma-Aldrich peptide handling references).

Can I reuse the same peptide vial for multiple draws?

Yes — that is the point of bacteriostatic water. The benzyl alcohol preservative makes the vial multi-use, so you can take repeated draws over roughly 28 days refrigerated. Wipe the rubber stopper with a fresh alcohol swab before every draw, use a new sterile needle each time, and never return drawn solution to the vial. If you reconstitute with plain sterile water instead, the vial has no preservative and should be treated as single-use within 24 hours.

What syringe is best for small peptide draws?

For most research draws, a U-100 (1 mL) syringe is marked directly in units — 100 units = 1 mL — so any volume you calculate lands on a mark on the barrel. For very small draws (under 5 units), a 0.3 mL (30-unit) syringe has more widely spaced markings and better precision, and a fine 29-31 gauge, ½-inch needle makes those marks easier to line up. If a single draw would exceed 100 units, reconstitute with less water to raise the concentration so it fits on one barrel, or split it across two draws.

Is this a peptide dosage calculator?

No. It runs reconstitution and syringe-unit math for laboratory research — the concentration (mg/mL) of a mixed vial and the equivalent units on a U-100 syringe scale. It does not recommend how much of any compound to use, for a person or an animal. If you searched 'dosage calculator,' the reconstitution math above is almost certainly what you need: turning a vial size and a water volume into a concentration and a syringe mark.

How much bacteriostatic water do I add to a peptide vial?

There is no single fixed amount — the volume you add sets the concentration, so pick a volume that makes your draw easy to measure. Common choices: 2 mL into a 5 mg vial gives 2.5 mg/mL, and 2 mL into a 10 mg vial gives 5 mg/mL. More water means a lower concentration and more units per draw (easier to measure but a fuller syringe); less water means a higher concentration and fewer units. Use the calculator above to test any combination.

How do I read units on a U-100 syringe scale for peptides?

A standard U-100 syringe scale is marked in units where 100 units = 1 mL, so 1 unit = 0.01 mL. To find your draw, multiply your volume per draw in mL by 100. For example, 0.05 mL = 5 units, and 0.10 mL = 10 units. The 'units' and 'IU' markings on the barrel refer to the same lines; 1 cc = 1 mL exactly.

How long does reconstituted peptide last, and how should it be stored?

Once mixed with bacteriostatic water, most peptides are stable for about 28 days when refrigerated at 2-8°C (36-46°F) and kept out of light. The 0.9% benzyl alcohol in BAC water acts as a preservative. Do not freeze a reconstituted vial, and discard it if the solution turns cloudy or discolored. Lyophilized (un-mixed) peptide powder keeps far longer — months to years frozen at -20°C. These handling ranges follow standard peptide manufacturer storage guidance (e.g., Bachem and Sigma-Aldrich peptide handling references).

Can I reuse the same peptide vial for multiple draws?

Yes — that is the point of bacteriostatic water. The benzyl alcohol preservative makes the vial multi-use, so you can take repeated draws over roughly 28 days refrigerated. Wipe the rubber stopper with a fresh alcohol swab before every draw, use a new sterile needle each time, and never return drawn solution to the vial. If you reconstitute with plain sterile water instead, the vial has no preservative and should be treated as single-use within 24 hours.

What syringe is best for small peptide draws?

For most research draws, a U-100 (1 mL) syringe is marked directly in units — 100 units = 1 mL — so any volume you calculate lands on a mark on the barrel. For very small draws (under 5 units), a 0.3 mL (30-unit) syringe has more widely spaced markings and better precision, and a fine 29-31 gauge, ½-inch needle makes those marks easier to line up. If a single draw would exceed 100 units, reconstitute with less water to raise the concentration so it fits on one barrel, or split it across two draws.

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Peptide Calculator

Q: What is the peptide reconstitution formula?

Concentration (mg/mL) = mg of peptide ÷ mL of bacteriostatic water. Then the units to draw on a U-100 syringe scale = (target amount in mg ÷ concentration in mg per mL) × 100. Example: 10 mg of peptide in 2 mL of BAC water is 5 mg/mL; a 250 mcg (0.25 mg) target is 0.25 ÷ 5 = 0.05 mL = 5 units.

Reconstitution & syringe-unit conversion. Full guide →

Research use only. This tool performs reconstitution math — concentration and syringe-unit conversion. It is not dosing guidance for humans or animals.

See the full reconstitution guide →

Quick-pick a peptide to auto-fill:

See all 34 →

Example: 10 mg vial + 2 ml BAC water = 5 mg/ml. At that concentration, a 250 mcg amount = 0.05 ml = 5 units on a U-100 syringe scale.

Peptide in Vial

Total peptide mass on the vial label

BAC Water Added

Amount of bacteriostatic water to add

Target Amount

Target amount per draw — research reference

Add vial price to see cost per draw

Vial Price (optional)

What you paid for the vial — used to compute cost per draw

Draw to

100

10.0 units

Draw to this line

Pull syringe to

10.0 IU

0.100 ml per draw

100

10.0 units

Draw to this line

Results

Your Answer

Draw to 10.0 IU for a 500 mcg amount.

10.0

Concentration

5.00

mg/ml

5000 mcg/ml

Volume per Draw

0.100

Volume to draw from the vial

Syringe Draw

10.0

On a U-100 syringe scale

Draws per Vial

draws

20.0 exact

Reconstitution guide

Quick Syringe Reference

Units

Volume (ml)

Amount (mcg)

Amount (mg)

5 IU

0.05

250

0.250

10 IUyou

0.10

500

0.500

15 IU

0.15

750

0.750

20 IU

0.20

1000

1.000

25 IU

0.25

1250

1.250

50 IU

0.50

2500

2.500

How peptide reconstitution works

Peptide reconstitution means dissolving a freeze-dried (lyophilized) peptide powder in bacteriostatic water so it can be drawn up into a syringe and measured. Two numbers decide your draw: the concentration of the mixed vial, and the number of units you draw on a U-100 syringe scale.

The peptide reconstitution formula

concentration (mg/mL) = mg of peptide / mL of BAC water

units on a U-100 syringe scale = (target amount in mg / concentration in mg per mL) × 100

On a U-100 syringe, 100 units = 1 mL, so 1 unit = 0.01 mL. To convert an amount in micrograms to milligrams, divide by 1,000 (250 mcg = 0.25 mg).

In one sentence: divide the peptide mass by the water volume to get concentration, divide your target amount by that concentration to get the volume in mL, then multiply by 100 to get syringe units.

Worked examples

Example 1 — BPC-157, 10 mg vial

10 mg peptide + 2 mL BAC water = 5 mg/mL. For a 250 mcg (0.25 mg) amount: 0.25 / 5 = 0.05 mL = 5 units on a U-100 syringe.

Example 2 — Semaglutide, 5 mg vial

5 mg peptide + 2 mL BAC water = 2.5 mg/mL. For a 250 mcg (0.25 mg) amount: 0.25 / 2.5 = 0.10 mL = 10 units on a U-100 syringe.

Example 3 — Tirzepatide, 60 mg vial

60 mg peptide + 6 mL BAC water = 10 mg/mL. For a 2.5 mg amount: 2.5 / 10 = 0.25 mL = 25 units on a U-100 syringe.

Add the water slowly down the inside wall of the vial — never spray it directly onto the powder. Swirl gently to dissolve; do not shake. Store the reconstituted vial refrigerated at 2-8°C (36-46°F) and use it within about 28 days. Bacteriostatic water contains 0.9% benzyl alcohol, a preservative that lets a multi-use vial stay usable for roughly four weeks refrigerated; plain sterile water has no preservative and should be used within 24 hours.

Sourcing note: lab-grade bacteriostatic water from BHG Labs is a common research choice alongside their peptides. Independent vendor; BodyHackGuide may earn a commission. BHG Labs is not BodyHackGuide.

Reconstitution reference

Step-by-step reconstitution guide: vial-to-concentration math, BAC water volumes, and syringe-unit conversion for 40+ research compounds.

Read the reconstitution guide →

All 34 peptide presets

Click Load on any row to auto-fill the calculator above.

Healing & Recovery

Peptide	Vial	Solvent	Amount	Syringe
BPC-157	10 mg	2 ml BAC	500 mcg	10.0 IU
TB-500	10 mg	2 ml BAC	3000 mcg	60.0 IU
BPC/TB Blend	20 mg	2 ml BAC	500 mcg	5.0 IU
GHK-Cu	50 mg	3 ml BAC	2000 mcg	12.0 IU
KPV	10 mg	2 ml BAC	500 mcg	10.0 IU
Thymosin α1	10 mg	2 ml BAC	1500 mcg	30.0 IU
Glow Blend	70 mg	3 ml BAC	1670 mcg	7.2 IU
KLOW Blend	80 mg	3 ml BAC	1670 mcg	6.3 IU

Fat Loss & Metabolic

Peptide	Vial	Solvent	Amount	Syringe
Semaglutide	30 mg	3 ml BAC	500 mcg	5.0 IU
Tirzepatide	60 mg	6 ml BAC	2500 mcg	25.0 IU
Retatrutide	10 mg	3 ml BAC	1000 mcg	30.0 IU
Cagrilintide	10 mg	2 ml BAC	250 mcg	5.0 IU
Tesamorelin	10 mg	2 ml BAC	1000 mcg	20.0 IU
MOTS-c	10 mg	2 ml BAC	1000 mcg	20.0 IU
5-Amino-1MQ	10 mg	2 ml BAC	1000 mcg	20.0 IU
AOD-9604	5 mg	2 ml BAC	300 mcg	12.0 IU

Growth Hormone

Peptide	Vial	Solvent	Amount	Syringe
CJC/Ipa Blend	10 mg	2 ml BAC	250 mcg	5.0 IU
Ipamorelin	5 mg	2 ml BAC	250 mcg	10.0 IU
Sermorelin	5 mg	2 ml BAC	250 mcg	10.0 IU
GHRP-2	5 mg	2 ml BAC	200 mcg	8.0 IU
GHRP-6	5 mg	2 ml BAC	200 mcg	8.0 IU
Hexarelin	2 mg	2 ml BAC	150 mcg	15.0 IU
IGF-1 LR3⚠️	1 mg	1 ml (acetic acid)	100 mcg	10.0 IU
HGH Frag 176-191	5 mg	2 ml BAC	350 mcg	14.0 IU

Cognitive & Mood

Peptide	Vial	Solvent	Amount	Syringe
Semax	30 mg	3 ml BAC	1000 mcg	10.0 IU
Selank	30 mg	3 ml BAC	1000 mcg	10.0 IU
Oxytocin	5 mg	2 ml BAC	50 mcg	2.0 IU
DSIP	5 mg	2 ml BAC	200 mcg	8.0 IU
Kisspeptin-10	5 mg	2 ml BAC	75 mcg	3.0 IU

Immune & Longevity

Peptide	Vial	Solvent	Amount	Syringe
NAD+	500 mg	5 ml BAC	75000 mcg	75.0 IU
Epithalon	10 mg	2 ml BAC	7500 mcg	150.0 IU
LL-37	5 mg	2 ml BAC	175 mcg	7.0 IU

Sexual & Cosmetic

Peptide	Vial	Solvent	Amount	Syringe
PT-141	10 mg	2 ml BAC	500 mcg	10.0 IU
Melanotan 2	10 mg	2 ml BAC	250 mcg	5.0 IU

Frequently Asked Questions

Embed This Calculator on Your Site

Drop the reconstitution calculator into any blog post, documentation page, or vendor product page — free, with optional white-label mode. Pre-fill values via ?vial=5&water=2&dose=250 or add cost-per-draw math with ?price=85. Match your brand with ?accent=%23hex and ?vendor=Your%20Brand.

<iframe src="https://www.bodyhackguide.co/embed/reconstitution" width="100%" height="640" frameborder="0" loading="lazy" title="Peptide Reconstitution Calculator" style="border:0;border-radius:14px;max-width:780px"></iframe>

Preview the embed →·See 5 drop-in presets + full URL params docs →

Compound-Specific Calculators

Pre-filled reconstitution calculators for popular peptides — tap to jump straight to your compound.

BPC-1575mg vial · 250mcg TB-5005mg vial · 2500mcg Semaglutide5mg vial · 250mcg Tirzepatide10mg vial · 2500mcg Retatrutide10mg vial · 2000mcg CJC-1295 (Mod GRF 1-29)2mg vial · 100mcg Ipamorelin5mg vial · 200mcg GHK-Cu5mg vial · 200mcg PT-141 (Bremelanotide)10mg vial · 1750mcg Semax5mg vial · 200mcg Selank5mg vial · 250mcg MOTS-c5mg vial · 5000mcg AOD-96045mg vial · 300mcg DSIP2mg vial · 100mcg Epithalon10mg vial · 5000mcg

Get the printable cheat sheet

All peptide dosing tables in a single PDF — free download.

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Free 2026 Peptide Cheat Sheet — 50 pages, PDF

Reconstitution math, concentration charts, half-lives, and vendor trust tiers. The reference we wish we had on day one.

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Research Use Only