Tesamorelin Calculator
A vial strength and a water volume give a concentration. A concentration and a syringe give units. Worked for the research-grade vial sizes tracked across vendors — not Egrifta’s own fixed pen/vial strengths.
Last reviewed: September 21, 2026
Vial strength and water volume give a concentration; a dose then gives the unit mark it corresponds to.
For research purposes only. Always verify calculations independently before use.
On this page
What reconstitution is
Research-grade tesamorelin, like other research peptides, ships from vendors as a lyophilized (freeze-dried) powder sealed in a vial. Reconstitution is the act of dissolving that powder in a liquid — typically bacteriostatic water — which turns a fixed mass of peptide (the vial’s labeled mg content) into a solution with a defined concentration, measurable in volume with a syringe. The mass doesn’t change; only how that mass is distributed through a volume of liquid changes.
Tesamorelin is unusual among the compounds tracked on this site: it is also sold as an FDA-approved product, Egrifta (WR and SV formulations), for HIV-associated lipodystrophy. Egrifta has its own fixed vial strengths and its own prescribing-information reconstitution instructions — this page is not that. It works the same generic arithmetic (concentration = mass ÷ volume) for the research-grade vial sizes vendors actually sell, which are different sizes from Egrifta’s. For the compound’s mechanism, trial evidence, and how the branded and research-grade material relate, see the tesamorelin profile.
What sizes does research-grade tesamorelin come in?
Three sizes, from 5 mg to 20 mg, are each carried by three or more of the vendors tracked here — the sizes with a real, multi-vendor market rather than one vendor’s own catalog choice. They are listed below with the number of vendors carrying each, read from live price data rather than a list kept by hand, which is why the calculator above offers exactly these as one-tap sizes. These are distinct from Egrifta’s own approved 11.6 mg (WR) and 2 mg (SV) vial strengths.
| Vial size | Vendors tracking this size |
|---|---|
| 5 mg | 10 |
| 10 mg | 42 |
| 20 mg | 13 |
The arithmetic, worked
Concentration (mg/mL) equals the vial’s total mg divided by the water volume in mL. Micrograms per syringe unit, on a U-100 syringe (100 units = 1 mL), equals that concentration multiplied by 10. The table below reports both figures at two illustrative water volumes for each tracked size — as a statement of what each volume does to the concentration, not a recommendation of either:
| Vial size | At 1 mL water | At 2 mL water |
|---|---|---|
| 5 mg | 5 mg/mL — 50 mcg/unit | 2.5 mg/mL — 25 mcg/unit |
| 10 mg | 10 mg/mL — 100 mcg/unit | 5 mg/mL — 50 mcg/unit |
| 20 mg | 20 mg/mL — 200 mcg/unit | 10 mg/mL — 100 mcg/unit |
Doubling the water volume halves the concentration and halves the mcg delivered per unit drawn — the relationship is linear in both directions. The general dosage calculator runs this same arithmetic for any vial size and water volume, including ones outside the table above.
Units to draw, by vial size and dose
Every cell is the U-100 unit mark a given dose comes to, for a given vial strength, at 2 mL of bacteriostatic water. The rows are the research-grade vial sizes three or more tracked vendors carry; the columns are round microgram values spanning the research-grade range and Egrifta’s own approved doses, reported flat and not as a schedule. See the tesamorelin profile for the mechanism, trial evidence, and the Egrifta label’s own dosing.
| Vial | 500 mcg | 1000 mcg | 1280 mcg | 1400 mcg | 2000 mcg |
|---|---|---|---|---|---|
| 5 mg | 20.0 | 40.0 | 51.2 | 56.0 | 80.0 |
| 10 mg | 10.0 | 20.0 | 25.6 | 28.0 | 40.0 |
| 20 mg | 5.0 | 10.0 | 12.8 | 14.0 | 20.0 |
Figures over 100 are shown in amber: they exceed a 1 mL U-100 barrel at this water volume, so that combination does not fit one syringe. More water lowers the concentration and raises the unit count; less water does the reverse. The calculator above works any vial, volume and dose, in either direction.
What one vial comes to
All three tracked sizes, worked at 2 mL. “Doses per vial” is the vial’s total divided by the dose — how many times that amount is present in the vial, before any loss in handling.
10 mg vial at 2 mL — 5.00 mg/mL
| Dose | Units to draw | Draw volume | Doses per vial |
|---|---|---|---|
| 500 mcg | 10.0 | 0.10 mL | 20.0 |
| 1000 mcg | 20.0 | 0.20 mL | 10.0 |
| 1280 mcg | 25.6 | 0.26 mL | 7.8 |
| 1400 mcg | 28.0 | 0.28 mL | 7.1 |
| 2000 mcg | 40.0 | 0.40 mL | 5.0 |
20 mg vial at 2 mL — 10.00 mg/mL
| Dose | Units to draw | Draw volume | Doses per vial |
|---|---|---|---|
| 500 mcg | 5.0 | 0.05 mL | 40.0 |
| 1000 mcg | 10.0 | 0.10 mL | 20.0 |
| 1280 mcg | 12.8 | 0.13 mL | 15.6 |
| 1400 mcg | 14.0 | 0.14 mL | 14.3 |
| 2000 mcg | 20.0 | 0.20 mL | 10.0 |
5 mg vial at 2 mL — 2.50 mg/mL
| Dose | Units to draw | Draw volume | Doses per vial |
|---|---|---|---|
| 500 mcg | 20.0 | 0.20 mL | 10.0 |
| 1000 mcg | 40.0 | 0.40 mL | 5.0 |
| 1280 mcg | 51.2 | 0.51 mL | 3.9 |
| 1400 mcg | 56.0 | 0.56 mL | 3.6 |
| 2000 mcg | 80.0 | 0.80 mL | 2.5 |
What changes the answer
- Water volume. Concentration is inversely proportional to water volume — the table above shows this directly. A larger water volume produces a lower concentration, meaning more units are needed to reach the same mcg amount, which can exceed a syringe’s barrel capacity at low concentrations and high mcg amounts.
- Vial size. For a fixed water volume, concentration is directly proportional to vial size — a 20 mg vial reconstituted with 1 mL is twice the concentration of a 10 mg vial reconstituted the same way.
- Syringe calibration. Every figure above assumes a U-100 syringe (100 units = 1 mL), the standard for peptide research (see the syringes and injection guide). A different calibration — U-40, for instance — would report a different units figure for the identical physical volume; it does not change the concentration or the mcg delivered.
How long does reconstituted tesamorelin last?
Egrifta’s own prescribing information is a real, checkable source — unlike the other three compounds on this page’s sibling calculators, which have no approved product at all.
Reconstituted Egrifta WR: the prescribing information states room temperature storage (20–25°C) and states unused solution is discarded 7 days after mixing — not refrigerated. Reconstituted Egrifta SV: the prescribing information states the dose is administered immediately following reconstitution, with any unused solution discarded; it does not specify a defined hold time like Egrifta WR’s 7 days.
Those figures describe Egrifta, the approved product, at its own approved vial strengths. Prof. Peptide has not identified a manufacturer label, published study, or lab document establishing how long reconstituted research-grade tesamorelin — the material this calculator’s vial sizes actually describe — remains stable. This page does not extend Egrifta’s figures to the research-grade material as fact.
FAQ
What is reconstitution?
Does the water volume change how much peptide is in the vial?
What syringe do the unit figures on this page assume?
Why doesn't this page say how much water to add or what dose to draw?
Is this the same as Egrifta's own reconstitution?
What if my vial's size isn't in the table below?
How much BAC water for a 5mg tesamorelin vial?
How much BAC water for a 10mg tesamorelin vial?
How much BAC water for a 20mg tesamorelin vial?
References
- Egrifta WR and Egrifta SV prescribing information, as already cited and verified on the tesamorelin profile. See that page’s own references section for the DailyMed setids and effective dates.
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