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To convert a TB-500 milligram amount to syringe units, first find the concentration: divide the vial’s milligrams by the milliliters of bacteriostatic water you add. A 5 mg vial in 2 mL of water is 2.5 mg/mL. On a U-100 syringe, units measure volume, so every 0.05 mL of that solution reads as 5 units, at any concentration. TB-500 has no established human dose, route, or regimen, so no amount is preset here. This is arithmetic only, not medical advice, and you should verify anything you plan with a licensed clinician.
TB-500 reconstitution & dosage calculator X
Reconstitution / draw volume / syringe units / supply-chain
Arithmetic checks out. Confirm clinically, against the label, and against the actual vial before any use.
Independent check - dose mg / concentration mg/mL = volume. U-100 units = mL x 100.
No clinically validated human dose for the TB-500 (LKKTETQ) fragment
No established dose - enter only protocol or prescriber values.
No default dose. Do not substitute full-length thymosin beta-4 study doses.
FDA states it has not identified human exposure data for the TB-500 fragment and lacks safety information.
U.S. Food & Drug Administration - fda.govSupply-chain signal only - not a potency guarantee. Enter the COA's tested mg and purity above so the math reflects the real vial.
View on finnrick.comReverse: pick a dose and the units you want it to read, then calculate diluent to add.
Same-syringe co-draw. Reconstitute each peptide in its own vial, then draw them into one syringe.
- Reconstitute each peptide in its own vial — never add water to multiple peptides in one vial.
- Only co-draw peptides with the same diluent (e.g. both bacteriostatic water) and compatible pH.
- Draw and inject fresh — do not pre-mix and store; mixture stability is not established.
- No blended stack is clinically validated. Verify each component and confirm with a clinician.
TB-500 concentration and syringe-unit conversion chart
| Vial + water | Concentration | Units per 1 mg | Units per 100 mcg |
|---|---|---|---|
| 2 mg + 1 mL | 2 mg/mL | 50 | 5 |
| 2 mg + 2 mL | 1 mg/mL | 100 | 10 |
| 2 mg + 3 mL | 0.67 mg/mL | 150 | 15 |
| 5 mg + 1 mL | 5 mg/mL | 20 | 2 |
| 5 mg + 2 mL | 2.5 mg/mL | 40 | 4 |
| 5 mg + 3 mL | 1.67 mg/mL | 60 | 6 |
| 10 mg + 1 mL | 10 mg/mL | 10 | 1 |
| 10 mg + 2 mL | 5 mg/mL | 20 | 2 |
| 10 mg + 3 mL | 3.33 mg/mL | 30 | 3 |
Concentration = vial strength divided by the bacteriostatic water added. On a U-100 syringe 100 units = 1 mL, so units = (dose divided by concentration) x 100. Values are syringe units, not milligrams. Amber values exceed 100 units, which is more than one standard 1 mL U-100 syringe holds, so that combination needs a more concentrated solution. No established dose exists for TB-500, so this chart deliberately shows conversion factors only and does not suggest a dose. Multiply the units-per-1-mg figure by your own dose in milligrams to convert any amount. For vial sizes or doses not shown here, use the general mg to units converter.
Sources
- U.S. Food & Drug Administration - fda.govNo identified human exposure data for TB-500 fragment. Basis for the regulatory status, route, frequency and published range shown on this page, and for the conversion factors in the chart above. Source last checked 2026-06-24
Frequently asked questions
Where does TB-500 stand with the FDA?
TB-500 is not FDA-approved, and the FDA flags the TB-500 (LKKTETQ) fragment as a compounding risk. No clinically validated human dose exists for it, so this tool ships with no preset dose - you type your own milligram and water figures and it only converts them.
Is TB-500 the same molecule as thymosin beta-4?
No. TB-500 is a short synthetic fragment (the LKKTETQ actin-binding sequence), not the full-length thymosin beta-4 protein used in research. There is no human exposure data for the fragment, so figures from full-length thymosin beta-4 studies don’t carry over, and this calculator assumes no equivalence between the two.
My vial says 2 mg, but I’ve seen 5 mg and 10 mg listed - does that change the math?
TB-500 is commonly sold as 2, 5, or 10 mg powder vials. Enter whatever milligram amount is on your label and the conversion scales to it. A larger vial only means more total peptide reconstituted, not a larger dose - and since no established dose exists, the milligram figure you enter is entirely your own.
Does this tool tell me how much TB-500 to inject?
No. It does arithmetic only - turning a milligram amount and water volume into U-100 syringe units - and is not medical advice. There is no established or approved self-use dose for the TB-500 fragment, so it recommends none. Verify anything you plan to do with a licensed clinician.
How do I go from a TB-500 powder vial to syringe units?
Reconstitute the powder first, then convert. To pick how much bacteriostatic water to add, use the bac water calculator; to read the mark off the barrel, use the insulin syringe calculator. This page only handles the mg-and-water-to-units step, and it applies no default TB-500 dose.