Tesamorelin Reconstitution Calculator

Mixing Tesamorelin: What to Know Before You Reconstitute

1. 01

   Bacteriostatic water vs. sterile water

   This is the step where tesamorelin diverges from most peptides. The approved pharmaceutical version is supplied with its own diluent and its labeling specifies sterile water with administration shortly after mixing, not multi day storage. Research vials carry no such labeling, and people reconstituting those generally use bacteriostatic water for the same reason they do elsewhere: the preservative allows the vial to be drawn from repeatedly. If your vial came with a supplied diluent and instructions, those instructions govern. If it did not, bacteriostatic water is the conventional choice for a multi dose vial.

2. 02

   How much water to add

   Water volume sets concentration, not content. A 5 mg vial holds 5 mg regardless of whether you add 1 mL or 3 mL. Because tesamorelin doses fall in the milligram range, the draws are larger than with microgram peptides, and water volume choices reflect that.

   Vial	Water	Concentration	Per unit	1 mg draw	2 mg draw
   2 mg	1 mL	2.0 mg/mL	20 mcg	50 units	100 units
   5 mg	2 mL	2.5 mg/mL	25 mcg	40 units	80 units
   5 mg	2.5 mL	2.0 mg/mL	20 mcg	50 units	100 units
   10 mg	2 mL	5.0 mg/mL	50 mcg	20 units	40 units

   The 2 mg column shows the constraint clearly: at several common concentrations a 2 mg draw fills a 100 unit syringe entirely, leaving no margin. Where doses sit in that range, people typically choose less water to raise the concentration. The syringe fill indicator in the calculator above shows this immediately.

3. 03

   Mixing technique

   Angle the needle so the liquid runs down the inside wall of the vial rather than onto the powder directly, then let it sit or swirl slowly until dissolved. Do not shake. Tesamorelin is regarded as more delicate than some peptides, so gentle handling gets emphasized. The finished solution should be clear.

4. 04

   Storage before and after mixing

   Unopened lyophilized vials are kept cool and dark. After reconstitution the picture depends on which version you have. The approved product's labeling directs prompt administration rather than storing the mixed vial for weeks. For research vials reconstituted with bacteriostatic water, the conventional window is the same roughly 28 days refrigerated that applies to punctured bacteriostatic water generally. Either way the mix date is the number that matters, and it is worth recording rather than remembering.

5. 05

   The syringe

   U-100 insulin syringes, 100 units to 1 mL, one unit per 0.01 mL. Because milligram doses produce large draws, the 1 mL 100 unit syringe is usually the practical choice. Smaller 0.3 mL and 0.5 mL syringes may not hold a full dose at common concentrations.

6. 06

   Common mistakes worth avoiding

   The frequent ones: applying research vial conventions to a pharmaceutical vial that came with its own diluent and instructions, adding so much water that a dose no longer fits the syringe, confusing mg and mcg during conversion, shaking rather than swirling, and reusing a prior unit count after mixing a new vial at a different volume.