Tesamorelin Reconstitution Volume Chart: How the Numbers Work

A tesamorelin reconstitution volume chart maps how much bacteriostatic water is added to a given vial strength, and what concentration results from each combination. The relationship is simple arithmetic — vial mg divided by mL of diluent — but the chart format is useful because it lets a reader compare several vial sizes and diluent volumes at a glance instead of recalculating each one by hand.

What a Reconstitution Volume Chart Actually Shows

Every listing for tesamorelin states a vial strength in milligrams, most commonly 2 mg or 5 mg. That number describes the mass of lyophilized peptide sealed in the vial before any liquid is added. A reconstitution volume chart takes that fixed mg amount and pairs it with several possible bacteriostatic water volumes to show the resulting concentration in mg/mL, and often the equivalent in mcg per 0.01 mL for syringe reference.

The underlying formula never changes:

concentration (mg/mL) = vial strength (mg) ÷ diluent volume added (mL)

More diluent lowers the resulting concentration; less diluent raises it. The vial’s total peptide content is fixed by the manufacturer and does not change no matter how much water is added — only how that fixed amount is distributed across the liquid volume.

Worked Example

Take a 5 mg tesamorelin vial reconstituted with 2 mL of bacteriostatic water.

5 mg ÷ 2 mL = 2.5 mg/mL

Converting to micrograms: 2.5 mg/mL × 1000 mcg/mg = 2500 mcg/mL. On a U-100 insulin syringe, where 1 mL corresponds to 100 unit markings, each unit line represents 1/100 of the total vial volume. At 2 mL total volume, 100 units equals 2 mL, so each syringe unit equals 0.02 mL. Multiplying that by the concentration: 0.02 mL × 2500 mcg/mL = 50 mcg per unit mark.

Recomputed a second way as a check: 5 mg total peptide spread across 100 units × 2 (since 2 mL fills the 100-unit barrel twice) means 200 total “unit-equivalents,” and 5000 mcg ÷ 200 = 25 mcg — this does not match, which flags the need to be careful about what “100 units” means at a given fill volume. The correct approach is the first one: figure out mL per unit at the actual reconstitution volume, then multiply by concentration. At 2 mL diluent, a standard 1 mL (100-unit) syringe only draws half the vial per full barrel, so the unit-to-mcg conversion must use the syringe’s own 0.01 mL per unit, not an assumption about the whole vial. Using 0.01 mL per unit: 0.01 mL × 2500 mcg/mL = 25 mcg per unit. This matches the second check, so 25 mcg per unit is the verified figure for a 5 mg vial in 2 mL of diluent on a standard U-100 syringe.

Reference Chart: Common Vial and Diluent Combinations

Vial Strength	Diluent Added	Concentration	Amount per U-100 Syringe Unit
2 mg	1 mL	2 mg/mL (2000 mcg/mL)	20 mcg
2 mg	2 mL	1 mg/mL (1000 mcg/mL)	10 mcg
5 mg	1 mL	5 mg/mL (5000 mcg/mL)	50 mcg
5 mg	2 mL	2.5 mg/mL (2500 mcg/mL)	25 mcg
5 mg	5 mL	1 mg/mL (1000 mcg/mL)	10 mcg

Each row follows the same two-step arithmetic: divide vial mg by diluent mL for concentration, then multiply concentration by 0.01 mL (one syringe unit) for the per-unit figure. A chart like this is only a reference for the math, not an instruction to use any particular volume — the correct row depends entirely on what a given protocol or listing specifies, which this chart does not determine.

Why Diluent Volume Varies Between Listings

Different suppliers and reference sources publish different suggested diluent volumes for the same vial strength. This is a matter of convenience and syringe compatibility, not a difference in the peptide itself. A lower diluent volume produces a more concentrated solution, which means small syringe measurements correspond to larger mcg amounts — useful when a listing wants to minimize the injected liquid volume. A higher diluent volume produces a more dilute solution, spreading the same total mg across more syringe units, which some references favor because it makes fine adjustments easier to read on a standard syringe scale. Neither approach changes the total mg of peptide contained in the vial; both are just different ways of dividing the same fixed quantity.

Bacteriostatic Water and Vial Labeling

Bacteriostatic water is the diluent referenced throughout tesamorelin listings because it contains a small amount of benzyl alcohol that inhibits microbial growth in the reconstituted solution, as opposed to plain sterile water which carries no such preservative. Vial labeling should specify total peptide content in mg, and separately whatever diluent volume a given source suggests pairing with it — these are two independent numbers that a reconstitution volume chart combines into one concentration figure. When comparing listings across sites, checking both numbers independently is more reliable than assuming a stated concentration is accurate without recomputing it from the mg and mL figures directly.

For readers comparing calculated figures against a second source, cross-checking the arithmetic with an independent tool such as peptcalc.com is a reasonable way to confirm a chart’s numbers before relying on them. Specification sheets and catalogue listings, including the reference page maintained by HEEZ Research, typically state vial strength in mg as the baseline figure from which any reconstitution chart is built.

Reading a Chart Correctly

A reconstitution volume chart is only as useful as the two inputs behind it: the vial’s stated mg content and the diluent volume actually used. Swapping either number without recalculating the rest of the row produces a mismatched concentration. When cross-referencing a chart against a specific vial, confirming the mg strength printed on that vial’s label against the chart’s row label is a necessary first step, since mislabeling or misreading a 2 mg vial as a 5 mg vial (or vice versa) will throw off every downstream figure by the same ratio as the labeling error itself.

Summary

A tesamorelin reconstitution volume chart is a table of concentration outcomes built from one formula: vial mg divided by diluent mL. Common vial strengths of 2 mg and 5 mg produce a predictable range of concentrations depending on how much bacteriostatic water is added, and those concentrations translate directly into mcg-per-syringe-unit figures once the syringe’s fixed 0.01 mL per unit is factored in. The chart format is a convenience for comparing several volume options at once, not a substitute for verifying the specific mg strength and diluent volume stated on an individual vial or listing.