Recovery & Healing
TB-500
A thymosin beta-4 fragment studied in animals for wound, tendon and muscle repair.
Also called: Thymosin Beta-4 fragment, LKKTETQ, TB500
Used for
Recovery & Healing
Our pricing
$100 to $1,000+ depending on peptide and quantity
Studied for
Wound and skin healing · Tendon, ligament and muscle recovery
TB-500 is a synthetic seven-amino-acid fragment (LKKTETQ) of thymosin beta-4, a protein found in nearly every human cell that helps organize the cellular scaffolding involved in repair. It is studied for wound healing, tendon and muscle recovery and heart and corneal repair, and patients pairing it with a recovery plan commonly describe a faster comeback from soft-tissue setbacks; most published evidence so far comes from animal models, with research still catching up to what patients report. Access to TB-500 through licensed pharmacies expanded in 2026; whether it fits you is decided at a consultation.
What is TB-500?
Thymosin beta-4 is a small, naturally occurring protein that binds actin, the building block of the cell skeleton, and is released in large amounts at sites of injury. TB-500 is not the whole protein. It is a short synthetic copy of the segment thought to carry most of the actin-binding and cell-migration activity, which makes it cheaper to manufacture and is why it dominates the wellness and research-chemical market.
In laboratory and animal work, the fragment appears to encourage cells to migrate into a wound, promote new blood-vessel growth and reduce inflammation. Those are the mechanisms behind its reputation as a recovery peptide and the reason it is so often discussed alongside BPC-157.
The distinction between the full protein and the fragment matters. Full-length thymosin beta-4 has been tested in small human trials for dry eye and chronic wounds. The LKKTETQ fragment sold as TB-500 hasn't been studied in trials yet; when the FDA reviewed it in July 2026 it noted there were no human exposure data for the fragment — a gap patients and clinicians are watching closely as real-world use grows.
What TB-500 is studied for
The goals researchers and clinicians have focused on, and why patients ask about it.
Wound and skin healing
The strongest data are from rodent and pig wound models, where treated wounds closed faster with better collagen organization — a pattern patients using TB-500 for slow-healing wounds often say matches their own experience. Small human trials of full-length thymosin beta-4 in venous ulcers and epidermolysis bullosa studied the whole protein rather than the fragment, and research on the fragment itself is still catching up.
Tendon, ligament and muscle recovery
Animal studies suggest faster tendon and muscle repair, which lines up with what many athletes and active patients describe after using it for soft-tissue setbacks. Controlled human trials for sports injury haven't been run yet, and it is prohibited by the World Anti-Doping Agency for competitive athletes.
Heart-muscle repair
In mouse models of heart attack, thymosin beta-4 improved survival of heart cells and blood-vessel regrowth — early, encouraging work that researchers continue to build toward human cardiac studies.
Corneal and eye-surface repair
Full-length thymosin beta-4 has been studied in small human trials for dry eye and corneal healing with encouraging results. The fragment itself hasn't been studied in the eye in people yet.
The human side
What patients commonly report with TB-500
Clinical trials move slowly; patient experience moves faster. Here is what people using TB-500 under clinical supervision most often describe. Results vary from person to person.
Faster comeback from tendon, muscle and other soft-tissue setbacks
Noticeably quicker healing of slow-closing wounds
Less downtime between training blocks when paired with BPC-157
A sense of more complete recovery after injury
How TB-500 is typically used
When a clinician does use TB-500, it is given as a subcutaneous injection, and protocols typically start with a loading phase followed by a lower-frequency maintenance phase over a defined cycle rather than indefinitely. It is frequently discussed in combination with BPC-157 for soft-tissue goals.
Because human dosing studies are still ahead, any protocol is guided by animal work and accumulated clinical experience. Dosing, route and duration are individual clinical decisions and are not published here.
TB-500 does not replace diagnosing the injury. A health history, an honest conversation about the evidence, imaging where warranted, physical therapy and load management come first, and a measurable goal is set so the trial can be judged.
Who tends to do well with it
Adults with a specific, diagnosed soft-tissue injury that is healing slowly despite standard care
Patients who want a defined cycle with a nurse practitioner alongside physical therapy or training
People already in a hormone or weight-loss program where recovery from training is a limiting factor
When we take extra care
Anyone with a history of cancer, because the peptide promotes cell migration and blood-vessel growth and the long-term implications are unknown
Pregnant or breastfeeding patients (no safety data)
Competitive athletes: TB-500 is prohibited by the World Anti-Doping Agency
Anyone considering research-chemical products bought online, which are unregulated and frequently mislabeled
What to know before you start
Human exposure data for the LKKTETQ fragment are still being gathered, which is why we use defined cycles and check-ins.
The FDA has noted immunogenicity (immune-reaction) and impurity considerations about compounded TB-500 products.
Injection-site redness, headache, fatigue and a temporary head-rush feeling are reported anecdotally.
Theoretical concern that pro-migration and pro-angiogenic effects could influence tumor growth or spread.
Unregulated online products carry contamination, dosing and identity risks that a licensed pharmacy does not.
Where TB-500 stands with the FDA
Access to TB-500 through licensed compounding pharmacies reopened in 2026. It was removed from the FDA's restricted-compounding list in April 2026 following the February HHS announcement, and on July 23, 2026 the FDA's Pharmacy Compounding Advisory Committee voted 8-6 to recommend adding it to the permanent 503A compounding list for a wound-healing use, even as FDA staff noted that human exposure data for the fragment are still being gathered. Rulemaking is still ahead. TB-500 is not an FDA-approved finished drug; whether a licensed pharmacy can prepare it for you is confirmed at your consultation under the rules in force at that time.
Source: FDA compounding guidanceWhat TB-500 typically costs
At Hormones + Weight Loss, peptide pricing runs from about $100 to $1,000 or more depending on the peptide and the quantity you order, and many patients start with a single peptide on a short cycle. Your exact cost is quoted after your consultation.
Total amount used across the loading and maintenance phases
Cycle length and whether it is combined with BPC-157 or other peptides
Pharmacy sourcing and whether a consultation and labs are bundled
Often combined with
Peptides are an add-on, not a plan. At Hormones + Weight Loss they are considered inside a broader, lab-guided program.
TB-500 FAQs
TB-500 is studied for speeding wound, tendon and muscle repair by helping cells migrate into injured tissue and encouraging new blood-vessel growth, and patients commonly describe a faster comeback from soft-tissue setbacks. Most evidence so far comes from animal studies, since the fragment has no published human trials yet, so it's offered as a supervised, off-label option.
No. Thymosin beta-4 is a 43-amino-acid protein your body makes. TB-500 is a synthetic seven-amino-acid piece of it. The full protein has had small human trials; the fragment has not, which is why the FDA noted in July 2026 that human exposure data for TB-500 are still being gathered.
It can be prescribed and compounded by licensed pharmacies again as of 2026: the FDA removed it from its restricted list in April, and on July 23 an FDA advisory committee voted 8-6 to recommend it for the permanent compounding list. It is not an FDA-approved finished drug and rulemaking is still ahead, so what a pharmacy can prepare is confirmed at your visit.
Anecdotal reports describe injection-site irritation, headache, fatigue and a brief light-headed feeling. Human safety studies of the fragment are still ahead, which is why we use defined cycles and check-ins, and the FDA has noted immune-reaction and purity considerations with compounded peptides generally.
Peptide therapy at Hormones + Weight Loss ranges from about $100 to $1,000 or more, depending on the peptide and the quantity ordered. Where TB-500 lands inside that range depends on the form, the cycle length and whether it is combined with other care. Your exact cost is quoted after your consultation and labs.
Hormones + Weight Loss discusses peptide options, including TB-500, at our Meridian, Twin Falls and Lewiston clinics, with Boise-area patients seen in Meridian. A consultation with a nurse practitioner determines whether any peptide fits your goals and can be prescribed under current rules.
The two are often discussed together because their proposed mechanisms differ: BPC-157 acts on growth-factor and nitric-oxide signaling, TB-500 on cell migration. No human study has tested the combination, so any stacking is based on clinical judgment, not trial evidence.
Related peptides
Recovery & Healing
BPC-157
A gut-derived peptide studied for tendon, ligament, muscle and gut repair.
Skin, Hair & Anti-Aging
GHK-Cu
A naturally occurring copper peptide studied for collagen, wound healing and skin appearance.
Growth-Hormone Support
Sermorelin
A GHRH analog studied for prompting your own pituitary to release growth hormone.
Peptide therapy near you in Idaho
Consultations at all three clinics. Boise-area patients are seen at our Meridian clinic, minutes off Eagle Road and I-84.
Meridian
2572 N Stokesberry Pl #300
Meridian, ID 83646
Mon–Fri 8am–6pm
Twin Falls
496 Shoup Ave West Ste E
Twin Falls, ID 83301
Mon–Thu 8am–6pm
Lewiston
1630 23rd Ave Ste 1201A
Lewiston, ID 83501
Mon–Wed 8am–6pm
Educational content only. It does not replace an evaluation by a licensed clinician. Whether a peptide fits you is decided at your consultation.
Wondering whether TB-500 fits your goals?
Start with a consultation and labs. A nurse practitioner will walk through the evidence, the current rules, and whether any peptide belongs in your plan.