TL;DR: A TB-500 units chart converts a target amount into marks on a U-100 insulin syringe, and it needs one input beyond the target: the concentration of the reconstituted vial. For a 10 mg vial at 2 mL, one unit is 50 mcg, so 2 mg is 40 units. At 5 mL, one unit is 20 mcg, so the same 2 mg becomes 100 units — a full 1 mL barrel. Everything below is concentration arithmetic for laboratory handling, not dosing guidance.
How to Read a Units Chart
The word "dosage" in these searches is really shorthand for a units conversion, and that conversion has one input beyond the target amount: concentration. Concentration is the vial mass divided by the volume of diluent added.
On a standard U-100 insulin syringe the barrel is marked 0–100 units, and one unit equals 0.01 mL. So the peptide held in a single unit is the concentration in mcg/mL multiplied by 0.01. The units for any target are then the target divided by that per-unit figure.
A units figure is meaningless on its own. "40 units of TB-500" only specifies an amount once you also know the vial was reconstituted to 5000 mcg/mL.
10 mg Vial Reference Charts
The TB-500 10 mg vial is most often reconstituted with either 2 mL or 5 mL of diluent. Both are tabulated below.
10 mg vial · 2 mL diluent · 5000 mcg/mL (each unit = 50 mcg):
| Target amount | Draw volume | U-100 units |
|---|---|---|
| 500 mcg | 0.10 mL | 10 units |
| 1 mg | 0.20 mL | 20 units |
| 1.25 mg | 0.25 mL | 25 units |
| 2 mg | 0.40 mL | 40 units |
| 2.5 mg | 0.50 mL | 50 units |
| 5 mg | 1.00 mL | 100 units |
10 mg vial · 5 mL diluent · 2000 mcg/mL (each unit = 20 mcg):
| Target amount | Draw volume | U-100 units |
|---|---|---|
| 500 mcg | 0.25 mL | 25 units |
| 1 mg | 0.50 mL | 50 units |
| 1.25 mg | 0.625 mL | 62.5 units |
| 2 mg | 1.00 mL | 100 units |
| 2.5 mg | 1.25 mL | 125 units — exceeds a 1 mL syringe |
Why TB-500 Amounts Run Larger Than BPC-157
This trips people up constantly, because the two compounds are so often discussed together. The published research uses them at genuinely different scales: BPC-157 protocols are typically described in the hundreds of micrograms, while TB-500 work is usually described in milligrams.
The practical consequence is that a BPC-157 units chart cannot be reused for TB-500. Reading across between them — treating "10 units" as equivalent because both came from a 10 mg vial — produces an order-of-magnitude error. Our BPC-157 dosage chart is tabulated separately for exactly this reason.
When a Draw Exceeds the Syringe
Notice the last row of the 5 mL table. At 2000 mcg/mL, a 2.5 mg target needs 125 units — more than a 1 mL syringe holds. There are three ways out, and only two are sensible:
- Reconstitute more concentrated. The same target at 2 mL of diluent is 50 units, comfortably within one barrel. This is usually the right answer.
- Split the draw. Workable but doubles the handling and the opportunity for error.
- Use a larger syringe. Possible, but larger barrels have coarser gradations and measure small volumes less precisely.
Choosing the dilution to suit the target is the cleaner discipline, which is why the decision is worth making before the diluent goes in rather than after.
Where the Concentration Comes From
Every figure above traces back to one step: how much bacteriostatic water went into the vial. That single decision fixes every unit conversion that follows, and it cannot be changed afterwards without starting from a fresh vial.
Our reconstitution guide covers the technique — adding diluent slowly down the vial wall, swirling rather than shaking — and the arithmetic is identical for TB-500. The storage guide covers stability and freeze-thaw once the vial is in solution.
Blends Work Differently
A pre-blended BPC/TB 10/10 mg vial holds 10 mg of each peptide, not 10 mg total. Reconstituted with 2 mL, that gives 5000 mcg/mL of each component — so a single unit delivers 50 mcg of BPC-157 and 50 mcg of TB-500 at the same time.
The consequence worth understanding: from a blended vial the two cannot be targeted independently. The ratio is fixed at the point of manufacture. Researchers who need to vary them separately use individual vials, which is covered in our BPC-157 + TB-500 article.
Use the Calculator for Anything Off-Chart
These tables cover the common setups. Any other vial size, diluent volume or target converts directly with the peptide reconstitution calculator, which also flags when a draw would overflow the syringe barrel you selected. For the compound background, see our what is TB-500 explainer or the TB-500 Canada guide for forms, purity and domestic sourcing.
A Note on "Dosage" Language
These tables use "target amount" deliberately rather than "dose." TB-500 is supplied as a research material and is not approved for human use by any regulator. The charts here are concentration references for laboratory handling — conversions between peptide mass and syringe units. They are not human dosing recommendations, and no route, schedule, or human use is implied by them.
For Research Use Only
Helix North supplies TB-500 10 mg as a research material with batch-specific HPLC purity verification, for research applications only — not for human or animal consumption, and nothing here constitutes medical, dosing, or clinical guidance.
