How to reconstitute Tesamorelin

What the water actually changes

A Tesamorelin vial arrives as a dry powder. The label states the mass of peptide inside. Adding bacteriostatic water does not change that mass. It only spreads the same peptide through a volume you can draw into a syringe and measure.

So the water volume sets one thing: concentration, in mg per mL. Concentration is vial mass divided by water volume. A 5 mg vial with 1 mL of water gives 5 mg/mL. The same vial with 2 mL gives 2.5 mg/mL. Same peptide, half the strength, twice the liquid.

Bacteriostatic water is used rather than plain sterile water because it contains a preservative intended to limit bacterial growth in a vial that will be entered more than once.

Reading the concentration table

Three things in the table are worth pausing on.

First, your syringe sees concentration, not vial size. A 5 mg vial in 1 mL and a 10 mg vial in 2 mL both land on 5 mg/mL. A given volume drawn from either carries the same amount of peptide. The larger vial simply lasts longer. Changing vial size does not have to change how you measure, as long as you scale the water with it.

Second, more water means larger volumes per dose. Because peptide mass is fixed, going from 1 mL to 3 mL on a 10 mg vial drops the fill from 10 mg/mL to 3.33 mg/mL. Any given dose then occupies three times the volume on the barrel. That helps when a dose would otherwise sit in the first few marks, where a small reading error is proportionally large. It hurts if the resulting volume exceeds what the syringe holds.

Third, the 3 mL column produces repeating decimals. The values 0.67, 1.67 and 3.33 mg/mL are rounded. The 1 mL and 2 mL columns give clean numbers at every vial size, which makes the arithmetic easy to check by hand.

Turning mg into a volume on the syringe

An insulin syringe is graduated in units, which are a volume scale on that particular barrel. Units measure liquid, not peptide. Before you can read units you need a volume in mL.

The conversion is one division: volume in mL equals dose in mg divided by concentration in mg/mL. Then find that volume on your barrel and convert to units using the scale printed on it.

Two cases from the listed dose amounts show why concentration choice matters. A 2 mg dose from a 2 mg/mL fill is exactly 1 mL, so it fills a 1 mL barrel completely. A 2 mg dose from a 1 mg/mL fill needs 2 mL, which will not fit in one draw at all. Run the division before you add water, not after, and confirm the dose you intend to measure lands somewhere readable on the syringe you actually own.

What this site does not know about Tesamorelin

Tesamorelin has been approved by a regulator for human use in at least one market. That is a regulatory fact, not a statement about your situation.

We hold no reliable human pharmacokinetic data for Tesamorelin. This site therefore makes no claim about its half life, how long it takes to clear, or whether it accumulates with repeated administration. If you find confident timing claims elsewhere, we cannot confirm them and will not repeat them.

This page also does not tell you what dose to use, how often, what to expect, what side effects occur, or whether any of it is safe for you. There is no medical review behind this content. The arithmetic here covers concentration and volume only. The dose amounts referenced above come from vendor listings, not from a recommendation.

Mixing technique

Remove the flip cap and wipe the rubber stopper on both the peptide vial and the water vial with an alcohol swab. Let them dry.

Draw your chosen water volume into a syringe. Angle the needle so the water runs down the inside wall of the vial rather than jetting onto the powder. Peptides are physically fragile, and a hard stream is avoidable stress.

Do not shake. Let the vial sit, then swirl or roll it gently until the solution is clear with nothing visible in suspension. Once mixed, the vial is a liquid at a known concentration, and that concentration is the only figure you carry forward to the syringe.

What we do not know

We hold no reliable human pharmacokinetic data for Tesamorelin, so this site makes no claims about its half life, how long it takes to clear, or how it accumulates. The arithmetic below concerns concentration and volume only.

This page answers arithmetic and handling questions. It does not tell you what dose to take, what to expect, or whether anything is appropriate for you, and there is no medical review behind it.

Common questions

How much bacteriostatic water should I add to a Tesamorelin vial?

There is no single correct volume. The table covers 1, 2 and 3 mL against 2, 5 and 10 mg vials, and every one of those combinations is arithmetically valid. Pick the one that puts your intended dose at a readable point on your syringe. If a prescriber specified a concentration, match it.

Does adding more water make the dose weaker?

It lowers the concentration, not the dose. More water means each mL holds less peptide, so the same dose in mg occupies a larger volume. The amount of peptide you inject is set by the volume you measure, not by how dilute the vial is.

Can I use plain sterile water instead of bacteriostatic water?

Sterile water has no preservative, so it does nothing to limit bacterial growth once the stopper has been punctured. That matters most for a vial entered more than once. We are not making a safety determination here, so ask a pharmacist or prescriber.

Why do two different vials give the same concentration?

Because concentration is mass divided by volume. A 5 mg vial in 1 mL and a 10 mg vial in 2 mL both work out to 5 mg/mL. The syringe cannot tell them apart. The 10 mg vial just holds more doses at that strength.

How long does Tesamorelin last once mixed?

We have no reliable data to answer that, so this page gives no figure. Stability after reconstitution depends on temperature, preservative and handling, none of which we can verify for your vial. Follow the storage instructions supplied with the product, or ask a pharmacist.

What if the dose is more than my syringe holds?

That means the concentration is too low for the dose. A 2 mg dose from a 1 mg/mL fill needs 2 mL, more than a 1 mL barrel. Use less water when mixing so the concentration rises and the dose volume shrinks.