All Pharmacy Peptides
TB-500 Injectable in its pharmacy container
Pharmacy Peptides · InjectableNew

TB-500 Injectable, 15 mg

A licensed provider approves before anything ships.

Made by a 503A facility for your prescription. Compounded drugs are not FDA-approved and are not the same as brand-name medications.

$169.99/mo

Plus a 3% service fee and any state tax at checkout.

3-month minimum: cancel before month 3 and it's $35 for each month left. No fee after that.

Strength
10 mg · $149.9915 mg · $169.99

Your provider confirms the strength that fits.

How to buy

LegitScript certifiedUS-licensed providers503A facility

$200.09 a month with the 3% service fee and $25 shipping. Plus any state tax.

Quick facts

Form
Injectable vial
Size
15 mg
How you get it
A prescription by a licensed provider
Made by
Made by a 503A facility for your prescription.
Ingredients
One ingredient per product. Never blended.
Policy
One of six peptides in HHS's interim compounding policy

How this works

  • Prescribed for youA US-licensed provider reviews your history before anything is filled, and decides whether it's right for you.
  • Filled for your prescriptionMade by a 503A facility for your prescription. Shipped to you. Syringes and alcohol prep pads included.
  • LegitScript certifiedIndependently checked for safe, legal telehealth practice. See our certification
  • Not approved? You pay nothingIf the provider doesn't approve it, it's refunded in full automatically.

What “not FDA-approved” means: compounded medicines are made by a licensed pharmacy and filled for an individual prescription. The FDA doesn't review compounded medicines for safety, effectiveness or quality before they're dispensed, the way it reviews approved drugs. Your provider decides whether one is right for you.

  • 503A facility
  • Single ingredient
  • Prescription required
HHS policy on hhs.gov
Is this right for you?

It may fit if:

  • You want a licensed provider to review your history before anything is prescribed
  • You want one ingredient, made for your prescription. Made by a 503A facility for your prescription.
  • You want to know who made it and how to report a problem
  • You'd rather not buy something labeled “not for human use”
  • You're comfortable with an injection, with directions from your provider

A licensed provider decides whether it's right for you, after reviewing your intake.

Research

What the research says (and doesn't)

What researchers have studied, and what they have not shown. None of this is a claim about what this peptide does for you; your provider talks with you about what is and isn't known.

Studied

  1. FDA review

    FDA described TB-500 as a synthetic, acetylated 7-amino-acid fragment (residues 17 to 23) of the 43-amino-acid protein thymosin β4, and found no published report of TB-500 itself being given to patients for any condition.

    “FDA did not find any information in the medical literature where TB-500 was administered to patients to treat any disease”

  2. Cell study

    In a fibroblast scratch-wound assay reviewed by FDA, intact TB-500 showed no activity; one of its breakdown products did. FDA found no in-vivo efficacy studies of TB-500 itself.

    “TB-500 (free base; at the concentration of 50 µg/mL) did not induce wound healing in confluent cultures of fibroblasts”

  3. Animal study

    In rats and in vitro, TB-500 was broken down into smaller fragments. One fragment was detected in urine for up to 72 hours.

    “the metabolite Ac-LKK was a long-term metabolite of TB-500 detected up to 72 hr.”

  4. Small human study

    A Phase 1 randomized trial gave intravenous thymosin β4 (the full 43-amino-acid protein, not TB-500) to four groups of 10 healthy volunteers, at single doses and 14-day daily doses.

    “There were no dose limiting toxicities or serious adverse events.”

  5. Registered trial, no results

    A randomized Phase 1/2 trial of TB-500 on cardiovascular biomarkers in stable atherosclerotic disease is registered in China, with 80 people planned and recruiting under way. It has no results yet.

    “TB-500 (Thymosin Beta 4 17-23 Fragment) for Cardiovascular Biomarkers in Stable ASCVD”

Not shown

  • No human study of TB-500 itself was found. The controlled human data are for the full thymosin β4 protein, a different molecule, given intravenously or as eye drops.
  • FDA found no in-vivo efficacy studies and no nonclinical toxicity studies of TB-500 itself, and said it is particularly concerned about the absence of human data by any route.
  • FDA raised aggregation, impurity and immunogenicity concerns, and said injectable routes may carry a particular risk of immunogenicity.
  • The Phase III eye-drop trial of the parent protein stopped early with 18 completers and missed its primary endpoint.

TB-500 is not FDA-approved. In briefing documents for its July 23–24, 2026 Pharmacy Compounding Advisory Committee meeting, FDA proposed not adding TB-500 to the 503A bulks list; the committee's votes and any final FDA decision were not found. HHS's interim policy describes the conditions under which HHS does not intend to act against a 503A pharmacy that compounds it for a patient's own prescription.

FDA PCAC briefing document, TB-500 (July 2026) HHS interim peptide policy (Appendix B)

If you compete in tested sport: USADA lists TB-500 and thymosin β4 as prohibited (WADA class S2). Source

Sources: FDA, NIH/PubMed, ClinicalTrials.gov, USADA, HHS

What you should know

What it is

TB-500 is an acetylated 7-amino-acid peptide fragment. It is one of the six peptides in an interim HHS policy for compounding pharmacies. Compounded drugs are not FDA-approved and are not the same as brand-name medications. Nothing is made or shipped until a licensed provider approves it for you. If a provider says it's not right for you, you pay nothing.

Who it's for

You want a peptide prescribed by a licensed provider, not a research-use vial. You want one ingredient, made for your prescription. You want a person to ask between visits.

What comes in the box

Your TB-500 Injectable, 15 mg, the syringes and alcohol prep pads you need for each injection, and the pharmacy insert, shipped cold-packed.

Can I get TB-500 with a prescription?

Yes, by prescription. TB-500 is one of the six peptides in HHS's interim policy (October 2026). A licensed provider decides whether it's right for you; if it is, it's made for your prescription by a 503A facility and shipped to you. Compounded drugs are not FDA-approved and are not the same as brand-name medications.

Do I need a membership for TB-500?

No. You can order TB-500 on its own: a short intake, a licensed provider's approval, and your prescription made and shipped. A membership adds four lab panels and four provider visits a year and a wellness consultant between visits.

How it's made

Made by a 503A facility for your prescription. One ingredient per product. Never blended. It is labeled with your name and your prescription.

Who sets the dose?

Your provider sets the dose.

Is it FDA-approved?

No. Compounded drugs are not FDA-approved and are not the same as brand-name medications. The HHS policy that covers it is not FDA approval, and HHS can revisit it.

Side effects and reporting

Tell your care team about anything you notice. Anyone can also report a side effect to the FDA through MedWatch.

Build your plan

Often paired with TB-500 Injectable, 15 mg.

Labs + Provider + Person = Your plan

Membership from $89.92/mo

4 Labcorp lab panels, 4 provider visits and a wellness consultant every year, on the annual plan. $149.99 month to month.

Start membership