One named substance
“TB-500” alone is not a complete formulation. Free base and acetate are distinct substances, so your pharmacy label names the exact form and strength.
Prescription TB-500
TB-500 Peptide Injection
When your body cannot keep pace with the work.
2 multi-dose vials · 30-day supply
As low as $389 $309Save 20% /month
Monthly subscription · vs buy once
Start online visitA licensed clinician reviews your visit first.
- Licensed U.S. clinicians
- U.S. compounding pharmacy
- Monthly plan
- Pause or stop before a refill
What is in the package
Two multi-dose vials of TB-500, a 30-day supply. One active ingredient, compounded for your prescription. The pharmacy prints the strength on each label.
What the plan includes
- A licensed U.S. provider's review of your online visit.
- The TB-500 medication, if it is prescribed.
- Two multi-dose vials each month.
- Discreet shipping within the U.S.
- Messaging access to the care team, before and after you start.
Shipping and refills
A licensed U.S. 503A compounding pharmacy fills each month's vials. Pause or stop before the next refill.
The part athletes recognize
TB-500 vials, with clinician-guided care.
The frustrating part is not always soreness. It is changing the warm-up, shortening the session, or wondering whether the same spot will object again. TB-500 comes as two multi-dose vials, prescribed and labeled for you.
Prescribed only after clinician review
A licensed U.S. provider reviews your visit first. A licensed 503A pharmacy compounds the vials only if they are prescribed.
Ready to move. Not ready to trust the same load.
Your TB-500 supply, one month at a time.
Each TB-500 prescription covers one month. Your prescription sets the schedule. Before each refill, your provider reviews your progress, and then the pharmacy ships the next month's vials.
| Detail | Specification |
|---|---|
| Format | Two multi-dose injection vials |
| Supply | 30 days |
| Exact substance and strength | Printed on the pharmacy label |
| Directions | Set by your prescription and printed on the label |
| Storage and beyond-use date | Printed on the pharmacy label |
| Pharmacy | Licensed U.S. 503A compounding pharmacy |
| Monthly price |
How care works
How TB-500 care works.
One prescription, reviewed by a clinician before anything ships.
- 01
Tell us about the recovery lag
A private online visit covers your training, the area that keeps changing how you load or move, and your health history.
- 02
A licensed provider reviews it
A licensed U.S. provider reads your visit and decides whether TB-500 fits, including whether you compete in a tested sport.
- 03
The pharmacy fills and ships
If TB-500 is prescribed, a licensed 503A compounding pharmacy fills it and ships it discreetly within the U.S.
- 04
Start on your prescribed schedule
Your pharmacy label and your clinician's directions cover the amount, schedule, storage, and beyond-use date.
- 05
Your care team stays
Message the care team about your schedule or a refill at any time. Your provider revisits the plan as needed, so tell them about new medications or changes in training.
The evidence
What the TB-500 studies measured.
Most TB-500 research comes from lab and animal models. Human research is limited, so your clinician weighs it against your health history.
What TB-500 is
TB-500 is the acetylated seven-amino-acid fragment Ac-LKKTETQ, residues 17 to 23 of thymosin beta-4. It contains the parent protein's actin-binding region but is not the same substance as full thymosin beta-4.
FDA briefing document, TB-500-related bulk drug substances. 2026.
Aged-mouse wound study
Researchers applied the non-acetylated fragment, not TB-500, to skin wounds in 26-month-old mice and measured more closure and collagen at day seven.
Eight-hour cell assay
In a fibroblast scratch test, TB-500 itself showed no significant difference in wound closure compared with vehicle.
Rahaman KA et al. J Chromatogr B. 2024.
Human data
FDA found no study that gave TB-500 to patients. The human trials on record used full-length thymosin beta-4, in two phase 1 safety studies of healthy volunteers.
Ruff D et al. Ann N Y Acad Sci. 2010. Liu J et al. J Cell Mol Med. 2021.
Sports medicine review
A 2026 structured review found that clinical use of injectable recovery peptides has outpaced high-quality evidence and regulatory consensus.
Clinical review
Questions that belong in the medical visit.
Your clinician reviews allergies, pregnancy or breastfeeding, any active cancer, and your current medications and therapies before prescribing.
Injection-site pain, redness, swelling, bruising, or infection can occur with injected medication. The pharmacy label and your clinician's directions control use, storage, missed doses, and when to stop.
Clinical review required before prescribingTB-500 questions
Frequently asked questions.
How much does TB-500 cost per month?
The price is shown at the top of this page, before any visit begins. It covers the licensed provider's review of your visit, the TB-500 medication if it is prescribed, a month of vials, and shipping within the U.S.
Can you get a prescription for TB-500?
Yes. A licensed U.S. provider can prescribe TB-500 after reviewing your online visit, and a licensed 503A pharmacy compounds it for you. TB-500 is not an FDA-approved drug, so it is prescribed only after that review.
Where can you get TB-500 from a legitimate source?
A legitimate source requires a prescription, has a licensed U.S. provider review your health history, names the 503A pharmacy that compounds the vial, and ships within the U.S. If a seller skips the prescription or labels vials for research use only, it is not a legitimate source for people.
What is the best TB-500 for a first-time user?
No form of TB-500 has been shown to work better in people. A first-time patient should be able to verify the basics: the exact form, free base or acetate, named on the label with the strength, lot number, and beyond-use date, and a clinician who reviews your visit before anything is prescribed.
Is TB-500 FDA-approved?
No. TB-500 is not FDA-approved and is not part of any FDA-approved drug. A 503A pharmacy compounds medication for one patient against a prescription, and compounded medications are not FDA-approved.
Is TB-500 banned in sport?
Yes. TB-500 is prohibited at all times under section S2.3 of WADA's 2026 Prohibited List, which covers thymosin beta-4 and its derivatives. The ban applies in and out of competition, so TB-500 is not an option for athletes in tested sports. If you are subject to testing, tell your provider during the visit.
What are the reported side effects of TB-500?
There is no human exposure data for TB-500, so its side effects in people are unknown. FDA found no adverse-event reports in its FAERS database and no published case reports. FDA raised concerns about immune reactions, aggregation, and impurities with injected peptides. No study has looked at TB-500 and the liver in people.
How long does TB-500 take to work?
There is no human data on TB-500, so there is no known timeline. In an aged-mouse study, a related non-acetylated fragment was measured at day seven. In an eight-hour cell assay, TB-500 itself showed no significant difference from vehicle. Individual responses vary, and your provider reviews your progress with you.
Can you take TB-500 every day?
Your schedule is set by the prescribing clinician and printed on the label. No dosing study of TB-500 in people exists, so there is no evidence-based daily schedule. If an online protocol suggests daily injections, discuss it with your clinician before changing anything you were prescribed.
Does TB-500 affect testosterone?
No study has measured TB-500's effect on testosterone in people. If you are on testosterone therapy or any other hormone treatment, mention it during your visit so your provider can weigh it with the rest of your health history. The same goes for supplements and any other peptides you take.
Can you get TB-500 without a prescription?
No. A legitimate TB-500 injection requires a prescription from a licensed provider. Vials sold online as "research use only" are not meant for people, and they come with no clinician review, no named pharmacy, and no label made out to you. A site that offers TB-500 with no health questions is not a legitimate source.
Is TB-500 legal?
TB-500 is not an FDA-approved drug, so it should only reach you through a licensed provider and pharmacy. A legitimate, clinician-led source reviews your health history before prescribing and labels the vial with your name, the strength, and the exact form of TB-500. Vials sold as "research use only" are not meant for people.
Why do I sign in to start?
Your visit, prescription, and orders live in your Rebody account. Log in or create an account with your email, and the visit opens next.
Can I pause or cancel?
Yes. Message your care team before the next refill to pause or stop. There is no cancellation fee.
Start an online visit
Ready to begin?
A licensed provider reviews your visit before anything is prescribed.
Still deciding?
Talk with the Rebody care team before you start. If injections are not for you, ask about the needle-free peptide formats, like nasal sprays and troches.
Call or text 650-535-8019