Calculator hub

Tesamorelin calculators

Reconstitution, dose, mg ↔ units, and vial duration — all four Tesamorelin calculators in one place, pre-filled with a 5 mg / 2 mL example.

Tesamorelin reference numbers

Derived from the example vial used to pre-fill the calculators below.

Vial
5 mg
mixed with 2 mL BAC water
Concentration
2.5 mg/mL
2500 mcg/mL
Example dose
1 mg
≈ 40 units on U-100
Doses per vial
5
at 1 mg
Weeks per vial
0.7
at 7× / week

Tesamorelin is a daily injection people use specifically to reduce stubborn deep belly fat (visceral adipose tissue). It's an analog of growth hormone-releasing hormone (GHRH) that prompts the pituitary to release more of the body's own GH. In FDA trials for HIV-related lipodystrophy, daily 2 mg injections reduced visceral fat by about 15–18% over 26 weeks. This page covers reconstitution math and daily dose logging.

How the four Tesamorelin calculators connect

This tool turns the three numbers on your Tesamorelin vial into the only number that matters at injection time: how many units to draw on a U-100 insulin syringe. The math is one formula — concentration in mg per mL equals the milligrams of peptide in the vial divided by the milliliters of bacteriostatic water you add — and every other answer falls out of that.

In the worked example below, a 5 mg vial of Tesamorelin reconstituted with 2 mL of BAC water produces a concentration of 2.5 mg/mL. To draw the example dose of 1 mg from that vial you pull 0.40 mL — about 40 units on a standard insulin syringe. Change any input and the rest updates instantly so you can pre-plan a vial before you ever touch a needle.

Vial size, diluent volume, and dose are the three inputs that genuinely change the answer. Doses-per-vial is a derived output — it's the vial mg divided by the dose mg, rounded down. The most common edge case is a tiny dose: at very high concentration, a 0.1 mL draw is only a few units on the syringe, which is hard to read accurately. If your unit count drops below five, consider reconstituting the next vial with more BAC water so each dose covers a larger volume.

What the Tesamorelin calculators cover

This hub gathers the four Tesamorelin calculators in one place — reconstitution, dose, mg ↔ units, and vial duration — pre-filled with a 5 mg / 2 mL example so the math is concrete the moment the page loads. Tesamorelin sits in the GH Secretagogue category, and the numbers each tool surfaces are tuned to how people actually log this peptide: a daily shot at the 1 mg example dose. A full-length GHRH analog with a protective group for a longer half-life and higher dose volume.

At the example concentration of 2.5 mg/mL, a 1 mg Tesamorelin dose draws roughly 40 units on a U-100 insulin syringe — the Dose calculator on the hub shows that working in real time, and the mg ↔ units converter flips it back the other way for people who think in milligrams. The Reconstitution calculator answers the day-one question (how much bacteriostatic water to add and what concentration that gives), and the Vial Duration calculator answers the planning question (how many weeks one vial covers).

For this 5 mg Tesamorelin vial, the example numbers imply about 5 doses per vial and roughly 0.7 weeks of coverage at 7 doses per week — that's the math the Vial Duration tool exposes, and it's the number most people use to decide when to reorder. Every calculator on the hub uses these same five inputs (vial mg, diluent mL, dose, doses-per-week, syringe type), so changing your real numbers in one tool gives consistent answers across the others.

How people log Tesamorelin

Protocols documented in published research on Tesamorelin typically involve a daily administration cadence, scheduled for seven days per week. The studied dose is substantial, frequently specified at 1 mg or 2 mg per day, which requires a much larger injection volume compared to GHRH fragments dosed in micrograms. For a 1 mg dose, drawing from a moderately concentrated vial requires careful measurement, often with a standard 1 mL U-100 insulin syringe to ensure accuracy for volumes that can be 40 units or more.

In a departure from the common evening schedule for many GH secretagogues, clinical trials for Tesamorelin predominantly utilized a morning-dosing schedule. The rationale is linked directly to its extended half-life; since the peptide provides a sustained GHRH signal, it is not necessary to time its administration to coincide with the primary natural growth hormone pulse during sleep. This morning administration pattern is a well-documented characteristic of the protocols established during its clinical development for its approved indication.

The structural stability of tesamorelin directly informs the administration schedules observed in research literature. Its resistance to DPP-IV degradation permits a daily dosing cadence, which allows for sustained engagement of the GHRH receptor. This contrasts sharply with native GHRH, which would require much more frequent administration to achieve a similar exposure profile. When planning documentation for a research project, this daily cadence is a key parameter to schedule and record. For calculation purposes, a 5 mg vial reconstituted with 2 mL of diluent contains 2.5 mg per mL. A 1 mg illustrative dose is therefore calculated as 0.4 mL or 40 units on a standard U-100 insulin syringe, often documented on a daily cadence.

Common Tesamorelin mistakes to avoid

  • Assuming the per-dose volume and syringe draw will be as small as sermorelin's and failing to plan for a larger subcutaneous injection.
  • Neglecting to systematically document and rotate injection sites, which can lead to localized lipohypertrophy that interrupts a planned daily schedule.
  • Mistaking the typical milligram (mg) dose for micrograms (mcg) in the calculator, leading to a thousand-fold dosing error.
  • Attempting to reconstitute a 5 mg vial with an excessively small diluent volume, making the large 1 mg dose difficult to measure and draw accurately.
  • Administering the daily dose in the evening by default, contrary to the morning administration schedule used in the vast majority of published clinical trials.
  • Mistaking the trans-3-hexenoyl modification for a simple carrier or delivery system, rather than the specific chemical shield it is.
  • Failing to distinctly log the molecule as tesamorelin, instead using the generic term 'GHRH', which obscures the critical stability difference in protocol review.
  • Neglecting to record whether the tracked material is the pharmaceutical product Egrifta or a research-grade compound, a distinction vital for data integrity.

Frequently asked questions about Tesamorelin

Why is the Tesamorelin dose in milligrams (mg) when other GHRH analogs are often dosed in micrograms (mcg)?
Tesamorelin's milligram-level dosing is a function of its molecular structure and the extensive clinical research that established its use profile. As the full 44-amino-acid GHRH sequence, its molecular weight and receptor affinity necessitate a larger mass to achieve the desired level of pituitary stimulation. The protocols for its FDA-approved indication were developed around a 1 mg or 2 mg daily dose, reflecting its distinct pharmacology compared to smaller, truncated peptide fragments.
What specifically is the purpose of the trans-3-hexenoyl group on Tesamorelin?
The trans-3-hexenoyl group is a fatty acid-based modification chemically bonded to the start of the peptide chain. Its sole purpose is to serve as a physical shield, sterically hindering the enzyme DPP-IV from accessing its cleavage site on the GHRH sequence. This protection from enzymatic degradation is what grants Tesamorelin a significantly longer half-life compared to native GHRH, which is its primary design advantage.
Using a 5 mg vial reconstituted with 2 mL of water, how many units would a 1 mg dose be?
When a 5 mg vial is reconstituted with 2 mL of bacteriostatic water, the solution's final concentration is 2.5 mg/mL. To obtain a 1 mg dose from this solution, you would need to draw 0.40 mL. On any standard U-100 insulin syringe, a volume of 0.40 mL is equivalent to exactly 40 units.
Why is tracking injection site rotation especially important for Tesamorelin?
The emphasis on site rotation is a direct consequence of its common protocol: daily administration combined with a relatively large dose volume. Delivering a volume of 0.4 mL (40 units) or more into the same subcutaneous tissue spot every day increases the risk of lipohypertrophy, a benign but palpable thickening of fat tissue. This can alter absorption rates and impact comfort, making the careful logging and rotation of sites an important variable to monitor for consistent administration.
Can Tesamorelin be considered a longer-lasting version of sermorelin?
While both peptides activate the GHRH receptor, they are fundamentally different molecules. Sermorelin represents only the first 29 amino acids of the GHRH sequence. Tesamorelin is the full 44-amino-acid sequence and includes an additional protective modification. This structural difference gives Tesamorelin a much longer half-life and leads to different studied protocols with larger dose magnitudes.
Why was Tesamorelin studied with morning, rather than evening, administration?
The morning administration schedule seen in most clinical literature is tied to Tesamorelin's extended half-life. Because it resists rapid breakdown and provides a prolonged GHRH signal for many hours, it does not need to be timed to coincide with the body's primary nocturnal growth hormone pulse. A morning dose provides a sustained level of GHRH receptor stimulation throughout the day, a profile that was extensively studied and established for its approved indication.
What is the concrete chemical difference between tesamorelin and native GHRH?
Tesamorelin is the full 44-amino-acid sequence of human GHRH with one specific chemical modification. A trans-3-hexenoyl group is covalently attached to the N-terminal tyrosine residue. This addition serves to protect the molecule from rapid degradation by the DPP-IV enzyme, which is what gives tesamorelin a significantly longer half-life compared to unmodified, endogenous GHRH.
What is the difference between Tesamorelin and Egrifta for logging purposes?
The active molecule is identical; tesamorelin is the generic name for the peptide, and Egrifta is the brand name for the FDA-approved pharmaceutical product. The key difference for logging is the source and standardization. Egrifta comes in a fixed-dose kit with verified purity, while material labeled as 'tesamorelin' is typically for research purposes and may have different purity and handling considerations. It is critical to document which form is being studied for accurate record-keeping.
Why is the DPP-IV enzyme unable to cleave tesamorelin?
The DPP-IV enzyme is prevented from cleaving tesamorelin due to steric hindrance. The enzyme's active site must physically access the peptide bond between the first and second amino acids (Tyr1-Ala2) to break it. The bulky trans-3-hexenoyl group attached at the N-terminus acts as a physical shield, blocking the enzyme's approach. This structural defense preserves the full-length peptide, allowing it to remain active in plasma for much longer.

Related on Peptide Pilot

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