Research-only notice: This article is for informational and research purposes only. Consult a qualified healthcare professional before using any peptide compounds. PepSync helps with logging and calculations; it does not provide medical advice, dosing recommendations, treatment plans, or safety guarantees.

TB-500 is a synthetic version of Thymosin Beta-4 (Tβ4), a naturally occurring peptide found in virtually all human and animal cells. It's one of the more extensively studied peptides, having been examined in numerous animal and in vitro studies for its role in tissue repair, angiogenesis (new blood vessel formation), and inflammation modulation. It is also among the most frequently used research peptides alongside BPC-157.

This guide covers TB-500's key properties, reconstitution research notes, storage requirements, and how it compares to BPC-157 for research research notes.

TB-500: Key Properties

  • Full name: Thymosin Beta-4 (synthetic fragment)
  • Sequence: 43 amino acid peptide
  • Molecular weight: Approximately 4,963 Da (larger than BPC-157)
  • Solubility: Readily soluble in water; dissolves well in BAC water
  • Cysteine content: Contains one cysteine residue — relevant for stability (see storage section)
  • Natural source: Thymosin Beta-4 is naturally produced in high concentrations at sites of tissue injury

Reconstitution research notes

Equipment

  • TB-500 lyophilized vial (typically 5mg)
  • Bacteriostatic water (BAC water) or sterile water
  • Insulin syringes (U-100)
  • Alcohol wipes

BAC Water vs Sterile Water for TB-500

TB-500 contains one cysteine residue, which theoretically could interact with benzyl alcohol in BAC water. In practice, at the concentrations used and for the storage durations typical in research research notes, BAC water is generally considered compatible with TB-500 by the research community. However, if you're concerned about benzyl alcohol sensitivity or plan a very long storage period, sterile water with frozen aliquots is the conservative alternative.

Standard Reconstitution (5mg Vial)

Common research notes: add 2mL BAC water to a 5mg vial → 2.5mg/mL concentration.

Reference dose-to-units table (2.5mg/mL, U-100 syringe):

  • 1mg dose = 0.40mL = 40 units
  • 2mg dose = 0.80mL = 80 units
  • 2.5mg dose = 1.00mL = 100 units (full 1mL syringe)

For 10mg vials: add 4mL BAC water → 2.5mg/mL (same table applies).

Note: TB-500 is typically used at higher doses than BPC-157 in research research notes, which is reflected in the dosing values above. See our dosage calculator guide for the math.

Reconstitution Steps

  1. Wipe both vial stoppers with alcohol wipes. Allow to air dry.
  2. Draw target volume of BAC water.
  3. Insert needle at angle into TB-500 vial, direct water down the glass wall slowly.
  4. Gently swirl until dissolved — TB-500 generally dissolves within 60–120 seconds.
  5. Inspect for clarity. Solution should be clear; a very faint tint may be normal.
  6. Label with date and concentration. Refrigerate immediately.

Research Dosing Reference

Published animal studies and community research research notes reference the following (for informational purposes only):

Loading Phase

Many TB-500 research notes begin with a "loading phase" of higher-frequency administration (e.g., twice weekly for 4–6 weeks) to establish tissue saturation before moving to a maintenance research notes.

Reference loading doses used in research contexts: 2–2.5mg twice weekly (subcutaneous administration).

Maintenance Phase

After a loading phase, maintenance research notes typically reference 1–2mg once or twice per month.

Acute research notes

Some research research notes use TB-500 acutely at 5–10mg per week for a defined period.

Storage Requirements

Lyophilized Powder

  • Refrigerated: 12–24 months stability
  • Frozen: 2–5 years; keep sealed until ready to use

Reconstituted Solution

  • Refrigerated in BAC water: 4–6 weeks
  • Frozen: 3–6 months, minimize freeze-thaw cycles
  • Important: Due to the single cysteine residue, TB-500 can be susceptible to oxidation over extended storage periods. If noting any yellow-brown discoloration, discard and reconstitute fresh.

TB-500 vs BPC-157: Research Comparison

Both are among the most popular research peptides, and they're frequently used together in combination research notes. Their mechanisms appear distinct but potentially complementary:

  • BPC-157: Gastric-origin peptide; animal research focuses on tissue healing, gastric protection, angiogenesis via VEGF, and tendon/ligament repair. Acts locally near the injection site as well as systemically. Smaller molecule (15 AA vs 43 AA).
  • TB-500: Thymic-origin peptide; research focuses on actin binding (which plays a role in cell migration and tissue remodeling), cardiac repair, systemic anti-inflammatory effects. Larger molecule with more systemic distribution in animal models.

The two mechanisms are different enough that they may provide additive effects in combination research notes. This is the basis for the "BPC/TB stack" commonly referenced in research communities.

Administration Route Considerations

TB-500, being a 43 amino acid peptide, is not considered orally bioavailable (unlike the smaller BPC-157 which shows some oral activity). Research research notes for TB-500 almost universally use subcutaneous or intramuscular injection. See our injection guide for technique details.