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Specimen Atlas of Research Peptides30 plates · MIT
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XXVPlate XXVReviewed 2026-04-25

TB-500

Actin-sequestering peptide

also known as Thymosin Beta-4, TB4, Tβ4, thymosin β4

Synthetic 17-amino-acid fragment of human thymosin β4 (TMSB4X), itself a 43-residue actin-sequestering protein abundant in platelets, white blood cells, and many other tissues. Promotes endothelial cell migration, blood vessel development, and accelerated wound re-epithelialization across animal models and Phase 2 trials. Often paired with BPC-157 for tendon / ligament / muscle repair.

§ I

At a glance

Per dose
2 mg
Evidence level
Phase 2
Half-life
~2 hr
Route

SQ or IM · Multiple sites · 2–3×/week

§ II

Mechanism

Primary target — G-actin (sequestering) + cell-surface integrins [goldstein-2012].

Pathway — Actin remodelling → cell migration; integrin-linked signaling → angiogenesis; anti-inflammatory cytokine modulation [goldstein-2012][malinda-1999].

Downstream effect — Accelerated wound healing, endothelial migration, hair follicle regeneration, cardiac repair (preclinical) [goldstein-2012].

Origin — 17-AA active fragment of endogenous 43-AA thymosin β4 (TMSB4X gene) [goldstein-2012].

Feedback intact — Endogenous protein at baseline; supplementation amplifies.

§ III

Dosage

Protocols described in the cited literature; not medical advice.

ParameterValue
Standard dose2 mg per injection [goldstein-2012]Anecdotal community range; clinical Phase 2 trials used 70–840 mcg/kg IV.
Frequency2× per week (loading); then 1× per week (maintenance)
Lower / starter dose1 mg per injection
Evidence basisAnimal-strong + Phase 2 dermal/ocular trials [goldstein-2012]
Duration4–8 weeks loading; longer maintenance for chronic injury
ReconstitutionBacteriostatic water, 1–2 mL per 5 mg vial
TimingEvening or pre-rest preferred (anecdotal)
Half-life~2 hours (estimated; tissue uptake longer)
§ III · b

Reconstitution

A pure mass-to-volume utility. Enter what you have in the vial; the atlas computes the volume per dose. No prescription information.

Inputs
The calculator does pure mass-to-volume math. It does not recommend a dose. Refer to TB-500's cited literature for protocol specifics.
Volumetric outputFig. C — reconstitution math
Volume per dose
0.250mL
25.0 units on a U-100 insulin syringe
Concentration
1000
mcg per mL
Doses per vial
8
at this dose
§ V

Adverse events

Severities follow the FDA / CTCAE convention.

Injection site reactionmild
Mild erythema, transient pain
GI symptomsmild
Rare nausea (anecdotal)
Cancer riskmoderate
Theoretical via angiogenesis pathway
Lethargy / fatiguemild
Reported anecdotally during loading phase
Antibody formationmild
No data (no long-term human trials)
Pregnancy / OBsevere
Avoid
Long-term safetymoderate
Unknown beyond Phase 2
Absolute contraindications
  • Active malignancy (theoretical angiogenesis concern)
  • Pregnancy / breastfeeding
Relative contraindications
  • Cancer history
  • Concurrent VEGF inhibitor therapy
§ VI

Administration

  1. 01
    Reconstitution

    Add 1–2 mL bacteriostatic water to 5 mg vial → 2.5–5 mg/mL. Roll gently.

  2. 02
    Injection site

    SQ near injury site (preferred), or systemic SQ (abdomen). Rotate sites.

  3. 03
    Timing

    Evening or pre-sleep is most common anecdotal timing.

  4. 04
    Storage

    Lyophilised: room temp, light-protected. Reconstituted: refrigerate, ≤30 days.

  5. 05
    Needle

    27–31G, 4–8 mm insulin syringe.

§ VII

Synergies

Appendix

Sources

17%

of 46 rendered claims carry a resolvable citation.

  1. [goldstein-2012]
    Goldstein 2012Thymosin β4 — A Multi-Functional Regenerative Peptide
    Expert Opin Biol Ther, 2012
  2. [malinda-1999]
    Malinda 1999Thymosin beta4 accelerates wound healing
    J Invest Dermatol, 1999
Plate composed 2026-04-25 · maturity reviewed · schema v1 · Contributors: peptidesdb-core · 38 fields uncited — open contributions