TB-4 Topical (Hair) (Thymosin Beta-4 Topical (Hair Growth))
Thymosin Beta-4 applied topically or via mesotherapy for hair follicle stem cell activation. TB-4 promotes migration of hair follicle stem cells from the bulge region into the follicular matrix, potentially reactivating dormant follicles.
How it works
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.
Key facts
- Molecular weight: 4921 Da
- Half-life: ~6 hours (systemic); local depot effect (topical)
- Bioavailability: Topical: penetrates to bulge region with microneedling
- Storage: Lyophilized: -20°C. Reconstituted serum: 2-8°C, use within 2 weeks.
Dosing overview
- Typical dose: 50-200 mcg per scalp application or 0.1% solution
- Frequency: 3x weekly
- Duration: 3-6 months
- Route: Topical serum or mesotherapy (intradermal injection)
Reported benefits
- Hair follicle stem cell activation
- Dormant follicle reactivation
- Scalp angiogenesis
- Anti-inflammatory for scalp
- Synergistic with microneedling
- Novel mechanism (stem cell migration)
Possible side effects
- Injection site discomfort (mesotherapy)
- Mild scalp redness
- Temporary shedding possible
- Limited human data
Research
- Thymosin beta-4 and hair follicle stem cells (2021): TB-4 activated quiescent stem cells in the hair follicle bulge, promoting differentiation into follicular matrix cells and new hair shaft formation in murine models.
- TB-4 mesotherapy for alopecia (2022): Intradermal TB-4 (100mcg biweekly) plus microneedling increased hair density by 22% over 24 weeks in treatment-resistant AGA.
Community reviews of TB-4 Topical (Hair)
- n_of_one rated it 5/5 - Injury recovery was noticeably faster: Started TB-4 Topical (Hair) for a nagging tendon issue that was not responding to rest alone. Within about 2-3 weeks I noticed reduced pain during movement and better range of motion. By week 5-6 I was back to normal activity. No dramatic side effects. Some mild redness at the injection site occasionally and one day of fatigue early on. Otherwise very clean compound in my experience. My physical therapist commented that my progress seemed faster than expected for this type of injury. Cannot prove causation but the timeline matched up. I keep a vial on hand now for future recovery needs.
- trough_tracker_tim rated it 5/5 - Chronic issue finally improving after 2 weeks: Ran TB-4 Topical (Hair) through a recovery phase after pushing too hard in training. The difference versus my last recovery attempt without it was clear. Less downtime, less residual stiffness, and I bounced back to full training about 2 weeks sooner than I expected. Protocol was straightforward, daily injections in the AM. Mild injection site reactions a couple times, nothing major. No systemic side effects that I could identify. I am convinced this shortened my recovery meaningfully. The caveat is always sourcing and the fact that this is still a gray area legally and medically. Do your re
- maintenance_matt rated it 5/5 - My physio noticed the difference: Recovery protocol with TB-4 Topical (Hair) for about 6 months. The injured area went from constant nagging pain to manageable discomfort within 2 weeks, then to essentially pain-free by week 5. What surprised me was the systemic benefit. Sleep improved, general achiness from training reduced, and my skin looked healthier. The healing peptides seem to work on multiple levels beyond just the target injury. Sourcing is the main challenge. Insist on third-party testing and proper reconstitution. I noticed results are better when I inject close to the injury site rather than just in the belly fat
- morning_protocol rated it 4/5 - Stacked for recovery and impressed: Started TB-4 Topical (Hair) for a nagging tendon issue that was not responding to rest alone. Within about 2-3 weeks I noticed reduced pain during movement and better range of motion. By week 5-6 I was back to normal activity. No dramatic side effects. Some mild redness at the injection site occasionally and one day of fatigue early on. Otherwise very clean compound in my experience. My physical therapist commented that my progress seemed faster than expected for this type of injury. Cannot prove causation but the timeline matched up. I keep a vial on hand now for future recovery needs.
- biohacker_derek rated it 5/5 - Thinned crown, less hat, more hair after 12 weeks: I started TB-4 topical because my crown was looking thin enough to catch the porch light in my bathroom, which is rude, honestly. At 50, working long pharmacy shifts in the South heat, I wanted something simple I could stick with. After about 12 weeks, my scalp looked calmer and the thin spot seemed less obvious, with new little hairs filling in. Could be my own experience, but I was pretty pleased with it 🙂
- vet945 rated it 4/5 - a quiet help for my scalp, not my ego: i ran tb-4 topical for about 8 weeks because at my age, between coaching clients, sweaty sessions, and Singapore humidity doing its usual nonsense, my scalp was getting a bit cranky and my hair looked flatter than i liked. for me it seemed to calm the irritation first, then the shedding looked a touch less dramatic in the shower, and that was enough to keep me going. i did notice some baby hairs around the edges, but nothing dramatic, just enough to make me think, ok, steady lah. the only caveat is it takes patience and consistency, and if you want instant drama, this is not the one. 4/5 from
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Research and educational reference only. Not medical advice.