What's the master formula for peptide reconstitution math?

Three lines: (1) Concentration mg/mL = vial mg ÷ bac water mL. (2) Volume mL needed = dose mg ÷ concentration mg/mL. (3) U-100 insulin syringe units = Volume mL × 100. Memorise these three and every peptide reconstitution problem reduces to substitution.

Why use U-100 insulin syringes?

U-100 insulin syringes are calibrated 100 units per 1 mL — the unit-to-volume conversion is always units = mL × 100. The narrow 29-31G needle minimises injection-site irritation for daily peptide research workflows. Maximum draw is typically 1 mL (100 U); for larger volumes use a 3 mL or larger syringe.

How much bac water should I add to a peptide vial?

Common research-protocol ratios: 1 mL gives highest concentration (smaller injection volume), 2 mL is standard (easier dose precision), 3-5 mL gives lower concentration (better for very small doses). Pick the ratio that lands your typical research dose in the 10-100 U-100 unit window for clean syringe draws.

Can I mix two peptides in the same syringe?

Generally not recommended in research protocols — peptide pH compatibility is unknown for most combinations, and precipitation can occur. Inject peptides separately, at different sites or times. The exception is research workflows where compatibility has been explicitly characterised (e.g., some growth-hormone-releasing peptide combinations).

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Peptide Reconstitution Calculator — Complete Vial Math for Every Stocked Compound

23 June 202613 min readREVIVE LAB UAE Research Desk

Peptide reconstitution calculator vial math UAE

Peptide reconstitution math is the same problem repeated across every compound: convert a mg-labelled vial into a mL-volume solution, then convert that into U-100 insulin syringe units. Three formulas cover every scenario. This is the complete walkthrough — formulas, worked examples for every peptide REVIVE LAB UAE stocks, and the unit-conversion tables that make the syringe draw obvious.

For research use only. The doses in the worked examples are drawn from published research literature. They are not therapeutic recommendations.

1. The three master formulas

Internalise these three. Everything else is substitution.

Formula 1 — Concentration:
Concentration (mg/mL) = Vial mg ÷ Bac water mL added

Formula 2 — Volume per dose:
Volume (mL) = Desired dose (mg) ÷ Concentration (mg/mL)

Formula 3 — U-100 insulin syringe units:
Units (U-100) = Volume (mL) × 100

For micro-doses where the result is expressed in micrograms, do all calculations in μg:

Concentration (μg/mL) = Vial μg ÷ Bac water mL
Volume (mL) = Dose μg ÷ Concentration μg/mL
Units (U-100) = Volume × 100

Always keep the same mass unit on both sides of the division. Mixing mg and μg is the most common math error.

2. Worked example — Retatrutide

Vial: 5 mg. Bac water: 1 mL. Desired dose: 2 mg (Jastreboff phase 2 starting titration).

Concentration = 5 mg ÷ 1 mL = 5 mg/mL
Volume = 2 mg ÷ 5 mg/mL = 0.4 mL
Units = 0.4 × 100 = 40 U on U-100 insulin syringe

Vial / bac water	Concentration	2 mg dose	4 mg dose	8 mg dose	12 mg dose
5 mg + 1 mL	5 mg/mL	40 U	80 U	n/a (vial limit)	n/a
5 mg + 2 mL	2.5 mg/mL	80 U	160 U (need 3 mL syringe)	n/a	n/a
10 mg + 1 mL	10 mg/mL	20 U	40 U	80 U	1.2 mL (need 3 mL syringe)
10 mg + 2 mL	5 mg/mL	40 U	80 U	1.6 mL (3 mL syringe)	2.4 mL (3 mL syringe)

Full Jastreboff-anchored reconstitution sits in retatrutide reconstitution math.

3. Worked example — Tesamorelin

Vial: 10 mg. Bac water: 2 mL. Desired dose: 2 mg/day (Falutz 2010 protocol).

Concentration = 10 mg ÷ 2 mL = 5 mg/mL
Volume = 2 mg ÷ 5 mg/mL = 0.4 mL
Units = 0.4 × 100 = 40 U

Vial / bac water	Concentration	1 mg dose	2 mg dose	Days per vial
5 mg + 1 mL	5 mg/mL	20 U	40 U	5 / 2.5
5 mg + 2 mL	2.5 mg/mL	40 U	80 U	5 / 2.5
10 mg + 2 mL	5 mg/mL	20 U	40 U	10 / 5
10 mg + 5 mL	2 mg/mL	50 U	100 U (full syringe)	10 / 5

4. Worked example — BPC-157 (micro-dose math)

Vial: 5 mg = 5000 μg. Bac water: 2 mL. Desired dose: 250 μg (mid-range research dose).

Concentration = 5000 μg ÷ 2 mL = 2500 μg/mL
Volume = 250 μg ÷ 2500 μg/mL = 0.10 mL
Units = 0.10 × 100 = 10 U

The 10× check: If the answer feels wrong, multiply both top and bottom by 1000 to switch mg ↔ μg. The result must be the same. If it's not, you've mixed units.

5 mg vial + bac water	Concentration	250 μg dose	500 μg dose	Days per vial (250 μg)
2 mL	2500 μg/mL	10 U	20 U	20
5 mL	1000 μg/mL	25 U	50 U	20
10 mL	500 μg/mL	50 U	100 U	20

5. Worked example — TB-500

Same micro-dose math as BPC-157. Vial: 5 mg. Standard research dose: 2 mg twice weekly (loading), then 2 mg weekly (maintenance).

5 mg vial + bac water	Concentration	2 mg dose
2 mL	2.5 mg/mL	80 U
5 mL	1 mg/mL	2 mL (full insulin syringe + cap)

6. Worked example — GHK-Cu

Vial: 50 mg or 100 mg. Research SC dose: 1-2 mg/day. Topical formulations use different math (mg dissolved in g of vehicle for percentage).

Vial	Bac water	Concentration	1 mg dose	2 mg dose
50 mg	2 mL	25 mg/mL	4 U	8 U
50 mg	5 mL	10 mg/mL	10 U	20 U
100 mg	2 mL	50 mg/mL	2 U	4 U
100 mg	5 mL	20 mg/mL	5 U	10 U

7. Worked example — MOTS-c

Vial: 10 mg. Standard research dose: ~3 mg/day SC.

Bac water	Concentration	1 mg dose	3 mg dose	5 mg dose
1 mL	10 mg/mL	10 U	30 U	50 U
2 mL	5 mg/mL	20 U	60 U	100 U (full)
5 mL	2 mg/mL	50 U	1.5 mL (3 mL syringe)	2.5 mL

8. Worked example — Semax (intranasal vs SC)

Vial: 10 mg. Russian clinical 0.1% formulation = 1 mg/mL. SC research dose: 0.25-1 mg/day.

Bac water	Concentration	250 μg dose	500 μg dose	1 mg dose
10 mL	1 mg/mL (matches 0.1% clinical)	25 U	50 U	100 U
5 mL	2 mg/mL	12.5 U	25 U	50 U

The 10 mL reconstitution is preferred because it matches the published Russian intranasal clinical formulation concentration.

9. Worked example — NAD+ (larger doses)

Vial: 100 mg. Standard research SC dose: 50-100 mg per session.

Bac water	Concentration	25 mg dose	50 mg dose	100 mg dose
2 mL	50 mg/mL	50 U	100 U (full)	2 mL (3 mL syringe)
4 mL	25 mg/mL	100 U (full)	2 mL (3 mL syringe)	4 mL

NAD+ injections sting more than most peptides; dilute concentrations and slower push reduce site reaction. Full NAD+ context sits in NAD+ vs NMN vs NR.

10. The reverse calculation — solving for bac water volume

Sometimes you want to land a specific dose at exactly 50 U (the half-syringe sweet spot). Solve backwards:

Bac water (mL) = Vial mg × Volume desired (mL) ÷ Dose (mg)

Example: Want 250 μg of BPC-157 at exactly 50 U (0.5 mL) draw.
Bac water = 5000 μg × 0.5 mL ÷ 250 μg = 10 mL

11. Stability — how long can you keep the reconstituted vial?

Peptide	Refrigerated stability (reconstituted)
Retatrutide	28-30 days
Tesamorelin	14 days reconstituted; freshly reconstituted weekly preferred
BPC-157	28-30 days
TB-500	28-30 days
GHK-Cu	28 days (blue tint should remain; fade = degradation)
MOTS-c	28-30 days
Semax	28-30 days
NAD+	14-21 days

12. UAE supply context

All peptides referenced above are stocked at REVIVE LAB UAE in HPLC-verified vials with lot-level COA. Bacteriostatic water UAE in 3 mL multi-dose vials ships in the same parcel.

Full catalogue at peptides UAE. Same-day Dubai dispatch on orders before 3 PM, 24 hours nationwide.

13. The summary

Three master formulas cover every reconstitution problem.
Keep units consistent (all mg or all μg) on both sides of division.
Pick bac water volume to land your typical dose in the 20-80 U-100 unit range.
For doses requiring >100 U, use a 3 mL syringe or split-dose at two sites.
Reconstituted peptide vials are stable refrigerated for 14-30 days depending on compound.

References

Manning MC, Chou DK, Murphy BM, et al. Stability of protein pharmaceuticals: an update. Pharm Res. 2010;27(4):544-575. PubMed
Vergote V, Burvenich C, Van de Wiele C, et al. Quality specifications for peptide drugs — a regulatory-pharmaceutical approach. J Pept Sci. 2009;15(11):697-710. PubMed
Frokjaer S, Otzen DE. Protein drug stability: a formulation challenge. Nat Rev Drug Discov. 2005;4(4):298-306. PubMed
Jastreboff AM, Kaplan LM, Frías JP, et al. Triple-Hormone-Receptor Agonist Retatrutide. N Engl J Med. 2023;389(6):514-526. PubMed
Falutz J, Allas S, Mamputu JC, et al. Long-term safety and effects of tesamorelin. J Clin Endocrinol Metab. 2010;95(9):4291-4304. PubMed

Peptide Reconstitution GuideFull sterile-technique walkthrough Retatrutide Reconstitution MathJastreboff dose schedule mapping Bac Water UAE — 3mLMulti-dose preservative-grade All Peptides UAEFull HPLC-verified catalogue