TB-500 Protocol, Dosing & Timeline

TB-500 Overview

Mechanism of Action

TB-500 is a synthetic version of a 43-amino-acid segment of Thymosin Beta-4, a naturally occurring protein involved in cell migration, differentiation, and tissue repair. It works primarily by sequestering G-actin, promoting cell migration to injury sites, and stimulating new blood vessel formation. TB-500 also reduces inflammation by downregulating inflammatory cytokines.

Half-Life

Approximately 1–2 hours (active metabolites persist longer)

Timing

No specific timing required; many prefer evening

Injection Site

Subcutaneous, abdomen or thigh. Systemic distribution regardless of site.

Food

No food restrictions

Common Stacks

BPC-157 — Complementary repair mechanisms
GHK-Cu — Collagen and skin synergy

TB-500 Dosing Protocol

Loading Phase

4–6 weeks

5–10 mg/week (split 2–3x)

Front-loading builds tissue concentration. Often split into 2.5–5 mg injections.

Maintenance

Ongoing

2.5–5 mg every 2 weeks

Lower frequency maintains benefits after initial loading.

TB-500 Expected Timeline

Week 1–2

Reduced acute inflammation; improved flexibility

Week 3–4

Enhanced tissue repair; hair growth commonly reported

Week 5–8

Significant injury recovery; improved overall tissue resilience

TB-500 Side Effects

Head rush shortly after injection (transient)

Mild lethargy in first few days

Injection site irritation

TB-500 Research Studies

Thymosin β4 accelerates wound healing

Malinda KM, Sidhu GS, Mani H, et al. — J Invest Dermatol (1999)

Demonstrated thymosin β4 significantly accelerated dermal wound healing by promoting cell migration and reducing inflammation.

PubMed: 10469339

Thymosin β4 increases hair growth by activation of hair follicle stem cells

Philp D, Nguyen M, Scheremeta B, et al. — FASEB J (2004)

Showed thymosin β4 stimulated hair follicle stem cells and promoted both hair growth and wound healing in animal models.

PubMed: 15319363

Thymosin β4 promotes angiogenesis, wound healing, and hair follicle development

Goldstein AL, Hannappel E, Sosne G, et al. — Ann N Y Acad Sci (2012)

Comprehensive review of thymosin β4’s multi-system tissue repair properties including angiogenesis and follicle regeneration.

PubMed: 22404082

TB-500 FAQ

Why is TB-500 often paired with BPC-157?

They work through entirely different mechanisms: TB-500 promotes cell migration via actin regulation while BPC-157 upregulates growth hormone receptors and works through the NO system. Together, they activate complementary repair pathways for faster, more complete healing.

Does TB-500 really promote hair growth?

Multiple studies have shown thymosin β4 activates hair follicle stem cells. Many users report noticeable improvement in hair thickness and growth, though individual results vary.