How to Reconstitute TB-500: Step-by-Step Guide for Researchers

Disclaimer: This guide is for research and educational purposes only. It is not medical advice. TB-500 is a research compound not approved by the FDA for human use. Consult a licensed healthcare professional before using any injectable compound.

TB-500 is a synthetic analog of Thymosin Beta-4 (TB4), a naturally occurring peptide found in virtually all human and animal cells. Preclinical research has studied TB-500 in the context of tissue repair, inflammation reduction, and angiogenesis. Like most research peptides, it arrives as a lyophilized powder and must be reconstituted before use.

This guide covers everything specific to TB-500 reconstitution: vial sizes, the concentration math, step-by-step instructions, dose-to-syringe unit tables, and storage guidelines.

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Common TB-500 Vial Sizes

TB-500 is available in the following vial sizes from research suppliers:

Vial size	Total mcg	Notes
2 mg	2,000 mcg	Common for lower-dose protocols or trying a new compound
5 mg	5,000 mcg	Most practical for standard multi-week protocols

TB-500 research protocols often use doses in the 500 mcg to 2 mg range per injection, with lower frequencies than BPC-157 (some protocols reference twice-weekly injection). A 5 mg vial at 500 mcg twice weekly provides 5 weeks of doses.

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Concentration Table: 2 mg Vial

BAC water added	Concentration	500 mcg dose	1 mg (1,000 mcg) dose
1 mL	2,000 mcg/mL	25 units	50 units
2 mL	1,000 mcg/mL	50 units	100 units

For the 2 mg vial, 1 mL of BAC water is the most common choice — it keeps injection volume small while providing a manageable concentration for the dose ranges used in research.

Concentration Table: 5 mg Vial

BAC water added	Concentration	500 mcg dose	1 mg (1,000 mcg) dose
1 mL	5,000 mcg/mL	10 units	20 units
2 mL	2,500 mcg/mL	20 units	40 units
2.5 mL	2,000 mcg/mL	25 units	50 units

For the 5 mg vial, 2 mL of BAC water is a standard choice. Use the BAC water calculator to customize for your protocol.

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What You Need

• TB-500 lyophilized vial
• BAC water (30 mL multi-dose vial)
• Syringe for transferring BAC water (3 mL, 21G–23G)
• U-100 insulin syringes for measuring doses (29G–31G, 0.5 inch)
• Alcohol swabs
• Label or tape for the vial

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Step-by-Step Reconstitution

Step 1: Prepare your workspace Wash hands. Lay out all supplies on a clean surface. Confirm you have the correct BAC water volume ready.

Step 2: Swab the septa Wipe the rubber stopper of both the BAC water vial and the TB-500 vial with a fresh alcohol swab. Allow to air-dry completely before inserting a needle.

Step 3: Draw BAC water Draw the target BAC water volume into the transfer syringe. For a 2 mg vial, draw 1 mL. For a 5 mg vial, draw 2 mL. You can introduce a small air bubble first to equalize pressure in the BAC water vial.

Step 4: Inject BAC water slowly Insert the needle into the TB-500 vial septum. Direct the stream of BAC water against the inside glass wall of the vial, not at the powder cake. Inject slowly to minimize agitation.

Step 5: Swirl gently Withdraw the needle and swirl the vial with a slow circular motion. TB-500 typically dissolves readily. If residual powder remains after swirling, refrigerate the vial for 15–30 minutes and check again.

Step 6: Inspect The reconstituted solution should be clear and colorless. Any cloudiness, visible particulates, or color change indicates a problem — discard and investigate.

Step 7: Label immediately Before refrigerating, label the vial with: peptide name, reconstitution date, BAC water volume, concentration, and use-by date (30 days from reconstitution).

Step 8: Store in refrigerator Place the vial at 2–8°C. Return it promptly after each use.

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Dose Examples with U-100 Units

2 mg vial + 1 mL BAC water = 2,000 mcg/mL:

Dose	Volume needed	U-100 units
250 mcg	0.125 mL	12.5 units (draw to 13)
500 mcg	0.25 mL	25 units
1,000 mcg (1 mg)	0.50 mL	50 units

5 mg vial + 2 mL BAC water = 2,500 mcg/mL:

Dose	Volume needed	U-100 units
500 mcg	0.20 mL	20 units
1,000 mcg (1 mg)	0.40 mL	40 units
2,000 mcg (2 mg)	0.80 mL	80 units

For full dose calculation with any vial size, use the TB-500 calculator or the main calculator.

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How TB-500 Compares to BPC-157 in Reconstitution

Both TB-500 and BPC-157 follow the same reconstitution process — BAC water, swirling, refrigeration. The key practical differences:

• Typical dose size: TB-500 is often used at higher mcg amounts per injection (500 mcg–2 mg) compared to BPC-157 (250–500 mcg), though both vary by protocol
• Injection frequency: Some TB-500 protocols reference twice-weekly injections; BPC-157 protocols often reference once or twice daily
• Vial duration: At twice-weekly 500 mcg doses, a 5 mg TB-500 vial lasts 5 weeks — within the 30-day BAC water window

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Storage Guidelines

State	Condition	Duration
Lyophilized	Freezer at -20°C	12+ months
Lyophilized	Refrigerator 2–8°C	Several weeks
Reconstituted in BAC water	Refrigerator 2–8°C	28–30 days

The same freeze-thaw rule applies: never refreeze a reconstituted vial. If you need to store TB-500 beyond 30 days, keep additional vials in lyophilized form in the freezer and reconstitute as needed.

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Frequently Asked Questions

Q: Can TB-500 and BPC-157 be reconstituted in the same vial? No. Keep each peptide in its own separate vial with its own concentration. Mixing peptides in a vial makes accurate dosing of each compound impossible and may affect stability of one or both.

Q: Can I use sterile water instead of BAC water for TB-500? Sterile water is acceptable for single-dose use. For multi-dose protocols (which is typical for TB-500 given typical vial sizes and dosing frequencies), BAC water is the appropriate diluent due to its 30-day preservative window.

Q: My TB-500 looks slightly yellowish after reconstitution. Is that normal? TB-500 solutions can occasionally have a very faint yellow tint depending on the synthesis process. A light yellow tint in an otherwise clear solution is often considered acceptable. If the solution is noticeably discolored, cloudy, or has particulates, contact your supplier.

Q: How often should I draw from the vial each week? This depends on your protocol. Each time you access the vial with a needle, use a fresh needle and swab the septum with alcohol first. The bacteriostatic preservative in the BAC water helps protect against contamination, but sterile technique matters.