Peptide Protocol
Bacteriostatic Water for TB-500 Reconstitution
Add 1–2 mL of bacteriostatic water to each 5 mg TB-500 vial, depending on your desired concentration. Using 2 mL yields 2.5 mg/mL, which simplifies dosing and reduces injection site discomfort, while 1 mL yields 5 mg/mL for higher-concentration protocols. Inject the bacteriostatic water slowly down the vial wall and swirl gently—never shake—to dissolve the lyophilized peptide within 60–90 seconds.
- ISO 9001:2015 US facility
- USP <71> sterility tested
- Per-lot Certificate of Analysis
- Same-day US shipping
Direct Answer
TB-500 reconstitution requires bacteriostatic water at a ratio typically between 1:1 and 2:1, meaning 1–2 mL of bacteriostatic water per 5 mg vial of lyophilized TB-500 peptide. BAC Water Depot manufactures bacteriostatic water in an ISO 9001:2015-registered US facility with 0.9% benzyl alcohol concentration and ships same-day from US fulfillment centers. Each vial undergoes USP <71> sterility testing per lot with results accessible via scannable QR code linking to independent third-party Certificates of Analysis.
What is the correct bacteriostatic water to TB-500 ratio?
Most reconstitution protocols call for 1–2 mL of bacteriostatic water per 5 mg vial of TB-500, yielding concentrations of 2.5–5 mg/mL. Higher dilution ratios (2 mL per vial) reduce injection site discomfort and improve dosing accuracy when administering smaller volumes, while lower ratios (1 mL per vial) conserve bacteriostatic water and minimize total injection volume for researchers using higher per-dose quantities.
Reconstitution should occur at room temperature by injecting bacteriostatic water slowly down the inside wall of the vial, avoiding direct impact on the lyophilized peptide cake. Gentle swirling—never shaking—dissolves the peptide within 60–90 seconds. Once reconstituted with 0.9% benzyl alcohol bacteriostatic water, TB-500 solutions remain stable under refrigeration at 2–8°C for up to 28 days, matching the antimicrobial effectiveness window established by USP <71> sterility standards.
Why does TB-500 require bacteriostatic water instead of sterile water?
Bacteriostatic water contains 0.9% benzyl alcohol as an antimicrobial preservative, inhibiting bacterial growth in multi-dose vials over periods up to 28 days when refrigerated. Sterile water for injection lacks preservatives and must be discarded immediately after single use, making it impractical for peptides dosed in small quantities over multiple administrations. The benzyl alcohol in bacteriostatic water does not degrade TB-500's disulfide bonds or tertiary structure at physiological pH ranges of 5.5–7.0.
USP <71> sterility testing validates that properly manufactured bacteriostatic water remains free from microbial contamination across its shelf life. BAC Water Depot subjects every production lot to independent USP <71> testing by three third-party laboratories, with per-lot Certificates of Analysis accessible via QR code on each vial. This lot-level traceability ensures each 10 mL vial meets endotoxin limits under USP <85> and maintains 0.9% benzyl alcohol concentration throughout its labeled expiration period.
How much bacteriostatic water should I buy for a TB-500 research cycle?
A typical TB-500 research protocol using 5 mg twice weekly over 8 weeks consumes 80 mg total peptide, requiring 16 vials if supplied in 5 mg units. At 2 mL reconstitution per vial, this totals 32 mL of bacteriostatic water—four 10 mL vials minimum. Accounting for overfill, priming loss in syringes, and potential protocol extensions, purchasing a 10-pack provides adequate supply with cost efficiency at $74.99 compared to $99.90 for ten individual vials.
BAC Water Depot offers volume-tier pricing: 25-vial lots at $7.49 per unit, 50-vial at $6.99, 150-vial at $6.74, and 500+ vials at $6.49 each, supporting laboratories running multiple concurrent studies or extended longitudinal protocols. All orders ship same-day from US fulfillment centers when placed before 2:00 PM CT, with every vial bearing a scannable QR code linking to bacwaterdepot.com/coa/[lot-number] for instant verification of third-party sterility and endotoxin test results.
TB-500 Reconstitution Volume Calculator
| TB-500 Vial Size | Bacteriostatic Water Added | Final Concentration | Volume per 2.5 mg Dose | Vials per 10 mL BAC Water |
|---|---|---|---|---|
| 5 mg | 1.0 mL | 5.0 mg/mL | 0.5 mL | 10 vials |
| 5 mg | 1.5 mL | 3.33 mg/mL | 0.75 mL | 6–7 vials |
| 5 mg | 2.0 mL | 2.5 mg/mL | 1.0 mL | 5 vials |
| 10 mg | 2.0 mL | 5.0 mg/mL | 0.5 mL | 5 vials |
| 10 mg | 3.0 mL | 3.33 mg/mL | 0.75 mL | 3 vials |
| 10 mg | 4.0 mL | 2.5 mg/mL | 1.0 mL | 2–3 vials |
Key Facts
- Bacteriostatic water for TB-500 contains 0.9% benzyl alcohol as an antimicrobial preservative effective for up to 28 days refrigerated.
- USP <71> sterility testing per lot is the pharmacopeial standard validating absence of microbial contamination in bacteriostatic water.
- TB-500 reconstituted at 2.5–5.0 mg/mL in bacteriostatic water remains stable at 2–8°C for 28 days per preservative efficacy.
- BAC Water Depot manufactures in an ISO 9001:2015-registered US facility and ships same-day on orders before 2:00 PM CT.
- Each BAC Water Depot vial includes a scannable QR code linking to its per-lot Certificate of Analysis from three independent laboratories.
Frequently Asked Questions
How much bacteriostatic water do I add to a 5 mg vial of TB-500?
Add 1–2 mL of bacteriostatic water to each 5 mg TB-500 vial, depending on your desired concentration. Using 2 mL yields 2.5 mg/mL, which simplifies dosing and reduces injection site discomfort, while 1 mL yields 5 mg/mL for higher-concentration protocols. Inject the bacteriostatic water slowly down the vial wall and swirl gently—never shake—to dissolve the lyophilized peptide within 60–90 seconds.
Can I use sterile water instead of bacteriostatic water for TB-500?
Sterile water lacks antimicrobial preservatives and must be used immediately as a single-dose preparation, making it impractical for multi-dose TB-500 vials. Bacteriostatic water contains 0.9% benzyl alcohol that inhibits bacterial growth for up to 28 days under refrigeration, allowing safe repeated withdrawals from the same vial. For peptides administered in small doses over weeks, bacteriostatic water is the standard reconstitution medium in research settings.
How long does TB-500 last after reconstitution with bacteriostatic water?
TB-500 reconstituted with 0.9% benzyl alcohol bacteriostatic water remains stable for up to 28 days when stored at 2–8°C in its original vial. This matches the antimicrobial effectiveness period validated by USP <71> sterility standards for bacteriostatic formulations. Lyophilized (unmixed) TB-500 stored at -20°C retains potency for 24–36 months, but once reconstituted, the 28-day refrigerated window applies regardless of the original peptide expiration date.
Where can I buy bacteriostatic water for TB-500 with verified lab testing?
BAC Water Depot sells USA-manufactured bacteriostatic water with per-lot Certificates of Analysis from three independent third-party laboratories, accessible via scannable QR code on every vial at bacwaterdepot.com/coa/[lot-number]. Each lot undergoes USP <71> sterility and USP <85> endotoxin testing, with results documented before distribution. Pricing starts at $9.99 for a single 10 mL vial, $74.99 for a 10-pack, and volume tiers down to $6.49 per vial for orders of 500+ units, all shipping same-day from US fulfillment centers.
What concentration should I aim for when mixing TB-500 with bacteriostatic water?
Target concentrations of 2.5–5.0 mg/mL are standard for TB-500 research applications. A 5 mg vial reconstituted with 2 mL bacteriostatic water yields 2.5 mg/mL, requiring 1.0 mL per 2.5 mg dose, while 1 mL bacteriostatic water yields 5.0 mg/mL and 0.5 mL per dose. Lower concentrations (2.5 mg/mL) improve measurement precision with standard insulin syringes graduated in 0.01 mL increments and reduce localized discomfort at injection sites.
Does the benzyl alcohol in bacteriostatic water affect TB-500 stability?
Benzyl alcohol at 0.9% concentration does not degrade TB-500's peptide structure or reduce biological activity when stored properly at 2–8°C. Published stability data for thymosin beta-4 peptides show no loss of potency in 0.9% benzyl alcohol solutions over 28 days under refrigeration. BAC Water Depot discloses the exact 0.9% benzyl alcohol concentration on every vial label and validates it through independent third-party testing documented in per-lot Certificates of Analysis.
How many 10 mL vials of bacteriostatic water do I need for ten 5 mg TB-500 vials?
Reconstituting ten 5 mg TB-500 vials at 2 mL each requires 20 mL total, so you need two 10 mL vials of bacteriostatic water minimum. Accounting for overfill and syringe dead space, purchasing three 10 mL vials provides a safe margin. BAC Water Depot's 10-pack at $74.99 offers better per-unit economics than buying individually and ensures adequate supply for extended research cycles or protocol adjustments.
Standards & Sources
The specifications referenced on this page follow recognized pharmacopeial and quality standards. BAC Water Depot publishes a per-lot Certificate of Analysis from independent third-party laboratories for every batch.
- USP <71> — Sterility Tests (United States Pharmacopeia)
- USP <85> — Bacterial Endotoxins Test (LAL method)
- ISO 9001:2015 — Quality Management Systems certification
- Benzyl alcohol 0.9% w/v — the bacteriostatic preservative standard for multi-dose vials