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Mechanism of action
TB-500 is a thymosin beta-4 fragment researched for actin-binding biology, cell migration, angiogenesis, tissue remodeling, and soft-tissue repair signaling. It is often paired conceptually with BPC-157 in regenerative protocols.
Half-life & pharmacokinetics
Half-life: Longer tissue-signaling window; human PK limited.
Human PK for TB-500 preparations is not standardized. Tissue-signaling effects are generally treated as longer-window than very short-acting peptides; twice-weekly research cadence is common.
Research dosing reference
2-5 mg two times weekly; often structured as a loading phase followed by maintenance.
Dose interpretation (U-100 units)
| Target dose | U-100 units |
|---|---|
| 2 mg | 40 units |
| 4 mg | 80 units |
| 5 mg | 100 units |
Units are concentration-specific - confirm against your actual reconstitution volume.
Reconstitution & concentration
| Vial | Preferred reconstitution | Final concentration |
|---|---|---|
| 10 mg | 2 mL BAC Water | 0.050 mg/unit |
| 20 mg | 2 mL BAC Water | 0.100 mg/unit |
Injection timing
Often administered two times weekly; timing can be aligned with recovery windows rather than acute effect timing.
Beginner escalation
Begin with lower weekly exposure to evaluate systemic response before increasing toward loading-style protocols.
Side-effect mitigation
Monitor injection irritation, transient fatigue, headache, flushing, or unexpected inflammatory response. Rotate sites and preserve sterile technique.
Stack compatibility
Commonly paired with complementary repair pathways such as BPC-157, TB-500, GHK-Cu, KPV, or SS-31 depending on tissue target.
Storage & stability
Lyophilized: refrigerated or controlled cool storage. Reconstituted: refrigerated, protected from heat/light, and handled aseptically.
Protocol duration & reassessment
Loading-style repair blocks commonly run several weeks, then transition to lower-frequency maintenance or discontinue after tissue-response reassessment. Avoid indefinite high-frequency repair dosing without a specific objective.
Frequently asked questions
What is TB500 and how does it work?
TB-500 is a thymosin beta-4 fragment researched for actin-binding biology, cell migration, angiogenesis, tissue remodeling, and soft-tissue repair signaling. It is often paired conceptually with BPC-157 in regenerative protocols.
What is the half-life of TB500?
TB500: Longer tissue-signaling window; human PK limited. Human PK for TB-500 preparations is not standardized. Tissue-signaling effects are generally treated as longer-window than very short-acting peptides; twice-weekly research cadence is common.
How is TB500 reconstituted for research?
Preferred reconstitution for the 10 mg vial is 2 mL BAC Water, giving 0.050 mg/unit. Always confirm concentration math before any use. Research use only.
Is TB500 FDA approved?
No. TB500 is an investigational research-use-only compound - not for human or animal consumption and not FDA approved.
All research reference · Research guides
External references: Peptide (Wikipedia) · U.S. Food and Drug Administration