FDA product approval
not established. No US therapeutic product approval is established by this curated source set; other countries and products may differ.
Healing · compound · checked 2026-10-09
TB-500 calculator
TB-500 math uses the listed vial sizes on this card and the liquid you type. Concentration in mcg per mL is vial milligrams times 1000, divided by milliliters. A U-100 syringe has 100 marks per milliliter, so each unit is that concentration divided by 100. Example numbers so you can see the math: a 5 mg listing plus 2 mL of liquid. Change any number and the units change. Try the numbers. A research-market vial is not the same material used in a trial.
Last checked Oct 9, 2026 by PepBear. Not medical advice.
Units chart for listed TB-500 sizes
U-100 math for listed TB-500 sizes. Each cell is micrograms per syringe mark if you add that much liquid. The table does the same math as the calculator. It does not pick an amount for you.
| Listed vial | 1 mL liquid | 2 mL liquid | 3 mL liquid |
|---|---|---|---|
| 5 mg | 50 | 25 | 16.7 |
| 10 mg | 100 | 50 | 33.3 |
What is TB-500?
Seller titles mix “TB-500” and “Thymosin Beta-4.” Those names can mean different things. A fragment and the parent peptide can differ in sequence, purity, and any studied effect. The library keeps both names and that warning. A listing names a product. It does not write a treatment.
The research name can refer to a thymosin-beta-4 fragment; it is not interchangeable with full-length thymosin beta-4.
Regulatory status, dated 2026-10-09
Compounding
not established. Compounded products do not carry FDA product approval; legal eligibility is not established here.
Research
investigational. No established human therapeutic evidence for the marketed fragment.
Sport
unknown. Not individually verified; consult the current sport rules. Absence of a listing is not permission.
What the cited papers actually measured
Most published thymosin-beta-4 work is lab or early human work. It does not prove every research-market vial sold as TB-500. WADA’s banned list is a sport rule. It is not a safety grade. FDA compounding-risk pages discuss related bulk substances. They do not create an approved product. If a paper used a defined sequence and a clinic product does not show the same sequence, the paper does not travel with the product. A seller title that prints both names on one line still needs the lot certificate before anyone reads those names as one molecule.
We mark the cited papers as D. That is our label for how strong those papers are. It does not say the compound works.
How long it lasts, how you store it, listed sizes
The catalog does not record a single hour value. No verified formulation-specific human estimate in this source set; no guessed value is supplied.
The vendor file lists 5 mg and 10 mg. Use the storage line printed on that vial. Fridge after adding liquid is a label question. It is not an amount instruction.
Risks and mix-ups already on the record
- Safety is incomplete; absence of reports does not establish safety.
- Unknown or incomplete for research formulations; this is not a clearance for use.
- Unknown or incomplete; do not infer compatibility with medications or other substances.
People using PepBear often log: Existing clinician-directed records, symptoms and dated health measurements. Record missing data; trends do not demonstrate causation.
Sources
- Primary evidence or regulator source · checked 2026-10-09
- WADA prohibited list · checked 2026-10-09
- Thymosin beta-4 review (PubMed) · checked 2026-10-09
Questions people ask
Is TB-500 the same as thymosin beta-4?
Some listings use both names. Read sequence, length, and testing on the actual certificate. This page does not treat the names as proven matches.
Does a 5 mg vial tell you how much to draw?
It only tells you the labeled mass. Units depend on how much liquid you add and which syringe scale you use. Type those values in the calculator.
How many units is a listed TB-500 vial after you add water?
Units = (amount in mcg ÷ (vial mg × 1000 ÷ water mL)) × 100 on a U-100 syringe. Enter the three numbers. The chart shows the same math for each listed vial size and 1, 2 or 3 mL of liquid.
Why flag amounts under 5 units?
A U-100 barrel is easy to misread below about 5 marks. That is a measuring warning. The page does not tell you to take more.
Related cards
A licensed clinician must interpret the evidence for your situation. This entry provides education, not treatment instructions. Not medical advice. PepBear does not pick a dose, a cycle, or a seller.