Can I use regular sterile water instead of bacteriostatic water?

You can in a pinch, but it is not ideal. Regular sterile water contains no preservative, so the entire vial should ideally be used in a single session. Bacteriostatic water contains a small amount of benzyl alcohol that prevents microbial growth, making it safe to draw from the same vial multiple times over several weeks.

Why does it matter how fast I add the water to the vial?

Peptides like Tesamorelin have delicate molecular structures. Adding liquid too forcefully or too quickly creates localized heat and foam at the contact point, which can physically damage those structures. Slow addition down the vial wall minimizes that stress and helps preserve the integrity of the compound.

How do I know how many units to draw for my dose?

That depends entirely on how much BAC water you used and the total peptide content of your vial. The math can get confusing fast. Use our calculator — it handles the conversion for you and gives you a precise number of syringe units, removing the risk of under- or over-drawing your dose.

What does reconstituted Tesamorelin look like, and how do I know if it has gone bad?

A correctly mixed vial should be completely clear and colorless, similar to plain water. If you notice cloudiness, visible particles that do not dissolve with swirling, or an unusual color, discard the vial. Also discard any vial that has been stored outside the fridge for an extended period or that is past its 30-day mixed-use window.

How to Reconstitute Tesamorelin Step by Step

What Is Tesamorelin, Anyway?

Tesamorelin is a synthetic analogue of growth hormone-releasing hormone (GHRH) — a molecule your body already makes naturally. It works by nudging the pituitary gland to produce and release its own growth hormone.^[3] It was FDA-approved in November 2010, making it the first treatment of its kind for a specific body-composition condition linked to HIV.^[5] Research continues to explore its effects on visceral fat and metabolic health.^[2]

Like most peptides, it comes as a delicate freeze-dried (lyophilized) powder. That powder needs to be mixed with a liquid — bacteriostatic water (BAC water) — before it can be used. That mixing process is called reconstitution. It sounds fancy. It really isn't.

What You'll Need Before You Start

Your Tesamorelin vial (the powder)
A vial of bacteriostatic water (BAC water — water with a tiny amount of benzyl alcohol to keep it sterile)
Alcohol swabs
A 1 mL insulin syringe or a small reconstitution syringe
Clean hands and a clean surface

Bacteriostatic water is preferred over plain sterile water because it keeps the solution safe across multiple draws from the same vial.^[6] Always use a fresh alcohol swab on every rubber stopper before you pierce it.

Step 1 — Warm the Vial Gently

Take your Tesamorelin vial out of the fridge and let it sit at room temperature for 5 to 10 minutes. A cold vial causes more foaming when you add liquid, and foam is your enemy here — it can damage the peptide. You can roll the vial gently between your palms to help it warm up. Never use a microwave or hot water.

Step 2 — Draw Your BAC Water

Wipe the stopper of your BAC water vial with a fresh alcohol swab. Let it air-dry for a few seconds. Insert your syringe and draw out the amount of water you need. A common starting point is 1 mL to 2 mL of BAC water per vial of powder, but the exact volume affects your final concentration. This is where our calculator becomes your best friend — plug in your vial size and desired dose, and it tells you exactly how much water to add and how many units to draw for each use.

Step 3 — Add the Water Slowly (This Part Matters!)

Wipe the stopper on your peptide vial with a fresh alcohol swab. Now, angle the syringe so the BAC water runs down the inside wall of the vial — not directly onto the powder. Add it slowly, a little at a time. Why? Blasting the powder with liquid creates bubbles and heat at the contact point, which can break down the peptide structure.^[1] Think of it like pouring beer down the side of a glass to avoid a head of foam.

Step 4 — Swirl, Don't Shake

Once all the water is in, swirl the vial gently in a slow circular motion. Do this for 20 to 30 seconds until the powder is completely dissolved and the liquid looks clear. If you see cloudiness or floating particles, keep swirling. Never shake the vial. Shaking introduces air bubbles and physical stress that can degrade the peptide chains.

A properly reconstituted vial should look like plain water — colorless and clear.

Step 5 — Measure Your Dose with the Calculator

Now that your solution is mixed, every dose needs to be measured precisely. Head to our calculator and enter your vial's total peptide amount (in mg), the volume of BAC water you added (in mL), and your intended dose. The calculator converts that into exact syringe units — no guesswork, no mental math. Tesamorelin has been studied at a dose of 2 mg once daily in clinical trials,^[2] but the calculator works for any configuration you enter.

Step 6 — Store It Correctly

Your reconstituted vial goes straight into the refrigerator (around 2–8 °C / 36–46 °F). Keep it away from the freezer and away from direct light. BAC water helps extend shelf life, but most reconstituted peptide solutions are best used within 30 days. Always label your vial with the date you mixed it so you never have to guess.

Dry, unmixed vials should also be stored in the fridge until you are ready to use them.^[4]

A Quick Safety Note

Tesamorelin has been shown to be generally well tolerated in research settings, with most side effects being mild injection-site reactions or events associated with growth hormone activity.^[5] It has not been linked to liver enzyme elevations or clinically significant liver injury.^[1] That said, this guide is for educational and research purposes only — always work with a qualified healthcare provider for anything medical.

Sources

Tesamorelin. — , 2012. PMID 31644039.
Efficacy and safety of tesamorelin in people with HIV on integrase inhibitors. — AIDS (London, England), 2024. PMID 38905488.
Tesamorelin. — Nature reviews. Drug discovery, 2011. PMID 21283099.
Tesamorelin update. — BETA : bulletin of experimental treatments for AIDS : a publication of the San Francisco AIDS Foundation, 2010. PMID 21591600.
Tesamorelin: a review of its use in the management of HIV-associated lipodystrophy. — Drugs, 2011. PMID 21668043.
Tesamorelin: a growth hormone-releasing factor analogue for HIV-associated lipodystrophy. — The Annals of pharmacotherapy, 2012. PMID 22298602.

How to Reconstitute Tesamorelin: A Friendly Step-by-Step Guide