How to Reconstitute TB-500: Step-by-Step Guide (2026)
TB-500 reconstitution guide: 2mL BAC water into a 5mg vial = 20 units per 2.5mg dose. Dilution charts, storage, and mistakes to avoid.
How to Reconstitute TB-500
TB-500 is a synthetic fragment of thymosin beta-4, a 43-amino acid protein involved in cell migration, tissue repair, and inflammation modulation. Like most research peptides, it ships as a lyophilized (freeze-dried) powder that needs to be reconstituted before use.
The process is identical to reconstituting any peptide — add bacteriostatic water, swirl gently, refrigerate. But TB-500 has a few quirks worth knowing: the doses are typically higher than peptides like BPC-157, meaning your dilution math matters more for syringe volume.
This guide covers everything from mixing to storage.
What You Need
Before you start, gather everything:
- TB-500 lyophilized vial (typically 2mg, 5mg, or 10mg)
- Bacteriostatic water (BAC water) — not sterile water, not saline
- Insulin syringes — 1mL (100 unit), 29-31 gauge
- Alcohol swabs — for cleaning vial tops
- A clean, flat workspace
Why bacteriostatic water? It contains 0.9% benzyl alcohol that prevents bacteria from growing in your reconstituted solution. Regular sterile water has no preservative — the vial must be used within 24 hours once opened. BAC water gives you up to 28 days refrigerated, which matters because TB-500 vials often last multiple weeks at standard dosing.
Step-by-Step Reconstitution
Step 1: Clean Everything
Wipe the tops of both vials (TB-500 and BAC water) with alcohol swabs. Let them air dry for 10 seconds. This is not optional — contamination is the most common cause of injection-site reactions.
Step 2: Draw Your Bacteriostatic Water
Using a fresh insulin syringe, draw your desired amount of BAC water. The amount you add determines your concentration (see the dilution charts below).
For a 5mg vial, 2mL is the sweet spot. It gives clean numbers for standard TB-500 doses while keeping injection volumes manageable.
Step 3: Add Water to the Peptide Vial
Insert the needle into the TB-500 vial at an angle, aiming at the glass wall — not directly at the powder. Let the water trickle down the side of the vial gently.
Do not squirt water directly onto the powder. TB-500 is a protein fragment. Aggressive force can damage the molecular structure and reduce potency.
Step 4: Let It Dissolve
Gently swirl the vial with a slow rotating motion. Do not shake it. TB-500 dissolves readily — you should have a perfectly clear, colorless solution within 1-2 minutes.
If you see persistent particles or cloudiness after 5 minutes of gentle swirling, the peptide may be degraded or improperly manufactured.
Step 5: Store Correctly
Refrigerate immediately at 36-46 degrees F (2-8 degrees C). The reconstituted solution is stable for up to 28 days with bacteriostatic water.
Dilution Charts
2mg Vial
| BAC Water Added | Concentration | 750mcg Dose | 2,000mcg Dose |
|---|---|---|---|
| 1mL | 2,000mcg/mL | 37.5 units (0.375mL) | 100 units (1mL) |
| 2mLRecommended | 1,000mcg/mL | 75 units (0.75mL) | 200 units (2mL) |
5mg Vial
| BAC Water Added | Concentration | 750mcg Dose | 2,500mcg Dose |
|---|---|---|---|
| 1mL | 5,000mcg/mL | 15 units (0.15mL) | 50 units (0.5mL) |
| 2mLRecommended | 2,500mcg/mL | 30 units (0.3mL) | 100 units (1mL) |
| 2.5mL | 2,000mcg/mL | 37.5 units (0.375mL) | 125 units (1.25mL) |
10mg Vial
| BAC Water Added | Concentration | 750mcg Dose | 2,500mcg Dose |
|---|---|---|---|
| 2mLRecommended | 5,000mcg/mL | 15 units (0.15mL) | 50 units (0.5mL) |
| 3mL | 3,333mcg/mL | 22.5 units (0.225mL) | 75 units (0.75mL) |
| 4mL | 2,500mcg/mL | 30 units (0.3mL) | 100 units (1mL) |
Why 2mL? It keeps injection volumes reasonable for TB-500's higher doses while giving numbers that are easy to measure on an insulin syringe.
The Math (So You Can Do It Yourself)
Here is the formula for any vial size and any amount of water:
Concentration = Peptide Amount (mcg) / Water Added (mL)
Then to find your injection volume:
Units to inject = Desired Dose (mcg) / Concentration (mcg/mL) x 100
Example: 5,000mcg vial + 2mL water = 2,500mcg/mL. For a 2,500mcg (2.5mg) dose: 2,500 / 2,500 x 100 = 100 units (1mL) — one full insulin syringe.
For a loading dose of 5mg from a 5mg vial reconstituted with 2mL: you would need to draw the entire vial (200 units / 2mL), which requires a larger syringe or two draws. This is why 10mg vials are more practical for higher-dose protocols.
Don't want to do math? Use our Reconstitution Calculator — plug in your vial size, water amount, and desired dose, and it does the rest.
Top TB-500 Vendors
Ranked by price, COA availability, and reputation
Common Mistakes
Shaking the Vial
TB-500 is a protein fragment. Shaking creates foam, trapping air bubbles against peptide molecules at the air-liquid interface. This can denature the peptide. Always swirl gently — never shake.
Using Too Little Water
Adding 0.5mL to a 5mg vial gives you 10,000mcg/mL. A standard 2,500mcg dose would be 25 units — workable, but leaves very little margin for error. A 750mcg maintenance dose becomes 7.5 units, which is hard to measure precisely. Use at least 1mL, ideally 2mL.
Leaving It at Room Temperature
Reconstituted TB-500 degrades at room temperature. Every hour on the counter reduces potency. Pull the vial out, draw your dose, put it back immediately. Keep it cold.
Reusing Needles
Each puncture through the rubber stopper dulls the needle and increases contamination risk. Fresh syringe every time. They cost pennies compared to the peptide itself.
Freezing Reconstituted Peptide
Freezing a liquid peptide solution creates ice crystals that can shear peptide bonds apart. Only freeze lyophilized (powder) peptides. Once reconstituted, refrigerate — never freeze.
How Many Doses Per Vial?
This depends on your dose and protocol phase:
5mg vial at 2,500mcg/dose (loading) = 2 doses 5mg vial at 750mcg/dose (maintenance) = 6-7 doses 10mg vial at 2,500mcg/dose (loading) = 4 doses 10mg vial at 750mcg/dose (maintenance) = 13 doses
At a typical loading protocol of 2,500mcg twice weekly, a 5mg vial lasts 1 week. A 10mg vial lasts 2 weeks. During maintenance at 750mcg twice weekly, a 10mg vial can last over 6 weeks.
Storage Quick Reference
| State | Temperature | Shelf Life |
|---|---|---|
| Lyophilized (powder) | Room temp | 6-12 months |
| Lyophilized (powder) | Refrigerated | 2+ years |
| Lyophilized (powder) | Frozen (-20C) | 3+ years |
| Reconstituted (BAC water) | Refrigerated | Up to 28 days |
| Reconstituted (sterile water) | Refrigerated | Use within 24 hours |
Pro tip: If you buy multiple vials, keep unopened ones in the freezer and only reconstitute what you will use within 3-4 weeks. TB-500 protocols often require several vials over a loading phase — plan ahead.
Related Reading
-
TB-500 Dosing Guide — protocols, cycles, and administration
-
BPC-157 Reconstitution Guide — the same process for the classic healing peptide
-
BPC-157 Bloodwork Guide — biomarker tracking for healing protocols
-
Wolverine Stack: BPC-157 + TB-500 — why these two are commonly stacked
-
SS-31 Reconstitution Guide — mixing guide for the mitochondrial peptide
-
GHK-Cu Dosing Guide — another regenerative peptide for tissue repair
-
Melanotan-2 Reconstitution Guide — reconstitution for a very different peptide
References
- Malinda, K.M., et al. (1999). Thymosin beta4 accelerates wound healing. Journal of Investigative Dermatology, 113(3), 364-368. PMID: 10469335
- Philp, D., et al. (2003). Thymosin beta4 and a synthetic peptide containing its actin-binding domain promote dermal wound repair in db/db diabetic mice and in aged mice. Wound Repair and Regeneration, 11(1), 19-24.
- Sosne, G., et al. (2010). Thymosin beta4 enhances repair by organizing connective tissue and preventing the appearance of myofibroblasts. Annals of the New York Academy of Sciences, 1194, 118-124. PMID: 20536458
- Bock-Marquette, I., et al. (2004). Thymosin beta4 activates integrin-linked kinase and promotes cardiac cell migration, survival and cardiac repair. Nature, 432(7016), 466-472.
- Goldstein, A.L., et al. (2012). The regenerative peptide thymosin beta4 accelerates the rate of dermal healing in preclinical animal models and in patients. Annals of the New York Academy of Sciences, 1270, 37-44. PMID: 23050815
- USP General Chapter 797: Pharmaceutical Compounding — Sterile Preparations. Storage and beyond-use dating guidelines for reconstituted peptides.
This guide is for educational and informational purposes only. It is not medical advice. TB-500 is sold as a research compound and is not FDA-approved for human use. Reconstituting and self-administering peptides carries inherent risks including infection, contamination, and dosing errors. Always use proper sterile technique. Consult a qualified healthcare provider before starting any peptide protocol. The Peptide Catalog is not responsible for any adverse effects resulting from the use or misuse of information presented here.