Finasteride vs TB-4 Topical (Hair)
A side-by-side research comparison of Finasteride and TB-4 Topical (Hair) across mechanism, dosing, half-life, benefits, side effects and research status.
Comparison table
| Attribute | Finasteride | TB-4 Topical (Hair) |
|---|---|---|
| Full name | Finasteride (Propecia/Proscar) | Thymosin Beta-4 Topical (Hair Growth) |
| Category | Hair Growth | Hair Growth |
| Status | FDA Approved (hair loss & BPH) | Research compound |
| Mechanism | Selectively inhibits type II 5-alpha reductase (predominant in hair follicles), reducing conversion of testosterone to dihydrotestosterone. Serum DHT decreases ~70%, scalp DHT ~40%, allowing follicle recovery. | 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 | 372.54 Da | 4921 Da |
| Half-life | ~6-8 hours (but DHT suppression lasts 24h) | ~6 hours (systemic); local depot effect (topical) |
| Bioavailability | ~80% oral | Topical: penetrates to bulge region with microneedling |
| Typical dose | 1 mg (hair) or 5 mg (prostate) | 50-200 mcg per scalp application or 0.1% solution |
| Frequency | Daily | 3x weekly |
| Route | Oral tablet | Topical serum or mesotherapy (intradermal injection) |
Finasteride reported benefits
- Halts hair loss progression (90% of men)
- Regrows hair (65% of men)
- Well-studied long-term safety
- FDA-approved
- Available generic
- Topical option available
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.