Thymosin Beta-15_Dosage, benefits & legal status
Also known as TB-15, T-beta-15, thymosin b15, Tbeta15
A thymosin the research literature knows as a cancer marker, not a repair peptide.
Common vial size is what vendors typically sell, not a recommendation. Enter your own vial in the calculator.
What is Thymosin Beta-15?
Plain language first. The technical label stays, but it never stands alone.Overview
Sold as an upgraded TB-500 because of the higher number. The research on it is about how far prostate tumors spread, which is the opposite of a selling point.
Thymosin beta-15, a beta-thymosin family actin-sequestering protein. Characterized in prostate carcinoma where immunostaining correlates with Gleason grade and expression is absent in normal prostate tissue. Patent literature covers its use in cancer prognosis. No published human efficacy or safety data exists for administration.
What it's used for
Sold as a repair and recovery peptide. Its published literature is about cancer cell motility.
How does Thymosin Beta-15 work?
What it does in the body, and where.The beta-thymosins all bind actin, and what a cell does with more actin mobility depends entirely on the cell.
- 01It is a beta-thymosin, like thymosin beta-4The family shares actin-binding, which is the property behind every repair claim made for TB-500. Thymosin beta-15 is a different member of that family.
- 02Its literature is oncologyThymosin beta-15 was characterized through work on prostate carcinoma, where staining intensity tracked with Gleason grade and it was found in tumor tissue but not normal prostate. Patents on it are for cancer prognosis and for antibodies to detect it.
- 03Cell motility is the mechanism in both readingsHelping cells move is useful in a healing wound and is the definition of metastasis in a tumor. The same property is being sold as a benefit and studied as a danger signal.
What else is it used for?
Each use below carries its own evidence level. Approved means regulators have cleared it for that purpose. Investigational means it is in trials. Early research means it is being studied and is not established.
- Tissue repair, which is the marketing claimnone
- As a marker of prostate cancer aggressivenessEarly research
- Cell motility researchEarly research
The published record
Papers and trials about Thymosin Beta-15
12 papers tagged human · 11 not reviews or lab · 0 clinical trial publications
Furthest stage reached: No clinical trial on record
Counted from Europe PMC indexing, not read by a person; a human tag can land on reviews, commentary or lab papers; clinical trial publications is the narrower count.
At a glance
Four things to know about Thymosin Beta-15
Evidence
Category
Healing and recovery
Common vial
Varies
Half-life
Nothing published
How much, and do you cycle it?
The range, and whether you take breaks.Research only, not established. Not established No range
No schedule has been studied for this compound in people.
Nothing publishedNo figure
No half-life has been published for thymosin beta-15 in people or in animals.
You can compare this against the whole library to see where it sits.
How do I dose and price it?
Enter your vial and your dose. Pick a mix. We show the draw and the cost.The vial holds a fixed amount of drug. Adding more water does not make more drug, it just spreads it thinner, so you draw a bigger number on the syringe for the same dose.
Choose your mix
Measuring the water1 mL = one full 100-unit syringe.
How do you store it?
Before mixing, and after.Dry powder in the freezer or fridge. Once mixed, fridge, and use within about a month.
Unmixed lyophilized Thymosin Beta-15 keeps for a long time cold. Once you add water the clock starts: most reconstituted vials hold up for roughly 28 to 30 days at fridge temperature. Keep it out of light, and do not freeze it after mixing.
What are the side effects and cautions?
Known cautions and warnings for this compound.This compound's documented biology is tumor cell motility. Anyone considering it should read the prostate cancer literature it comes from rather than the product page.
Solubility, computed: 48% charged residues, 23% hydrophobic. Water usually sufficient.
A first-pass rule from peptide manufacturers' guidance. It does not account for disulfide bridges, salt form or how the powder was dried, and it predicts what should be easy rather than what will happen in your vial.
Who should avoid it
- Active cancer, or any history of cancer
- An undiagnosed lump, or a raised PSA that has not been investigated
- Pregnancy or breastfeeding
- Anyone who wants established safety data, because none exists for this compound in humans
Stop and get help
- Signs of an allergic reaction, including spreading hives, facial or throat swelling, or trouble breathing
- Redness, heat, or pus at the injection site, which can signal infection
- Anything unusual, since there is no known safety profile to compare it against
Common effects
- Unknown. No study has recorded what this commonly causes in people
- Redness, soreness, or a small bump at the injection site
Where this page says nothing is established, that means nobody has studied it, not that a compound is safe.
Is Thymosin Beta-15 approved?
And where the numbers on this page come from.No. Thymosin Beta-15 is not approved for any use, anywhere. It is sold labeled for laboratory research only, and there is no legal route to buy it for human use.
- Approval statusResearch only
- RouteUnder the skin (subcutaneous)
- Checked24 August 2026
- DoseFrom community reports. No regulator or trial established this dose.
- Vial sizeFrom what vendors typically list; not a recommendation.
- SourcesNone traced yet.
What has happened recently
We have not yet written a full regulatory note for this compound. The status above is current as of the date shown.
You can compare this against the whole library, or read how to check a seller.
What else is like Thymosin Beta-15?
Others in Healing and recovery, side by side.If you're weighing Thymosin Beta-15, it's worth reading BPC-157, TB-500 / Thymosin Beta-4, and KPV in the same class.
A thymosin the research literature knows as a cancer marker, not a repair peptide.
- Dose
- Research only
- How often
- Not established
A popular healing peptide for injuries, gut, and joint or tendon pain.
- Dose
- 0.25 up to 0.5 mg per dose (start low, increase slowly)
- How often
- 1-2x daily
A recovery peptide for healing muscle and tendon, often paired with BPC-157.
- Dose
- 2 up to 2.5 mg per injection (start low, increase slowly)
- How often
- Twice a week
A tiny anti-inflammatory peptide for gut and skin, with no tanning effect.
- Dose
- 0.2 up to 0.5 mg per day (start low, increase slowly)
- How often
- Daily, 4-8 wk courses
Guides for this compound
- How to Reconstitute a Peptide
Mix peptide powder with bacteriostatic water, step by step.
- How to Read an Insulin Syringe
Read the units, convert to millilitres, and draw the exact dose.
- mcg vs mg: The Peptide Dosing Mistake to Avoid
Your vial says mg and your protocol says mcg. Here is the conversion and how to check it.
- Why Does My Peptide Injection Itch or Welt
Injection-site irritation, a histamine reaction, or a true allergy, and how to tell them apart.
- How to Read a Peptide COA
What the purity number does and does not tell you, and how to spot an edited report.
Sources
No primary source has been traced for this compound yet. Treat everything on this page as unverified until one is. How we grade evidence
Beyond these, 42 records are indexed. Browse the records