RU-58841 vs TB-4 Topical (Hair)
A side-by-side research comparison of RU-58841 and TB-4 Topical (Hair) across mechanism, dosing, half-life, benefits, side effects and research status.
Comparison table
| Attribute | RU-58841 | TB-4 Topical (Hair) |
|---|---|---|
| Full name | RU-58841 (PSK-3841) | Thymosin Beta-4 Topical (Hair Growth) |
| Category | Hair Growth | Hair Growth |
| Status | Research compound | Research compound |
| Mechanism | Non-steroidal androgen receptor antagonist with high binding affinity. Applied topically, penetrates to dermal papilla cells where it blocks DHT-AR complex formation, preventing transcription of hair-miniaturizing genes without systemic antiandrogen effects. | Promotes migration and differentiation of hair follicle stem cells via actin sequestration and cell motility enhancement. Activates quiescent stem cells in the bulge niche. Stimulates new blood vessel formation around follicles for nutrient delivery. |
| Molecular weight | 369.34 Da | 4921 Da |
| Half-life | ~1 hour (in skin/plasma); active at receptor for 8-12h | ~6 hours (systemic); local depot effect (topical) |
| Bioavailability | Topical only - minimal systemic absorption | Topical: penetrates to bulge region with microneedling |
| Typical dose | 50-100 mg in 1mL vehicle | 50-200 mcg per scalp application or 0.1% solution |
| Frequency | Daily application to scalp | 3x weekly |
| Route | Topical (dissolved in ethanol/PG vehicle) | Topical serum or mesotherapy (intradermal injection) |
RU-58841 reported benefits
- Local anti-androgen (no systemic effects)
- No sexual side effects
- DHT blocking at follicle level
- Can combine with oral finasteride
- Fast-acting (visible in weeks)
TB-4 Topical (Hair) reported benefits
- Hair follicle stem cell activation
- Dormant follicle reactivation
- Scalp angiogenesis
- Anti-inflammatory for scalp
- Synergistic with microneedling
- Novel mechanism (stem cell migration)
Related comparisons
Research and educational reference only. Not medical advice.