Tesamorelin is a synthetic growth hormone-releasing hormone (GHRH) analog consisting of 44 amino acids. It is the only GHRH peptide that has received FDA approval (marketed as Egrifta) for a specific indication — the reduction of excess abdominal fat in HIV-associated lipodystrophy. For researchers and practitioners working with tesamorelin protocols, precise dosing calculations and proper reconstitution technique are essential to consistent results.
This guide walks through everything you need to calculate tesamorelin doses from standard 2mg vials, reconstitute the peptide correctly, administer subcutaneous injections, and time doses for optimal protocol adherence.
Standard Tesamorelin Research Dosing Protocols
The most commonly referenced tesamorelin dose in clinical literature and research protocols is 2mg administered once daily via subcutaneous injection. This is the dose used in the pivotal Phase III trials and reflected in the FDA-approved prescribing information for Egrifta.
| Protocol | Daily Dose | Frequency | Notes |
|---|---|---|---|
| Standard research protocol | 2mg (2000mcg) | Once daily | Most commonly studied dose |
| Conservative start | 1mg (1000mcg) | Once daily | Sometimes used for initial titration |
Studies indicate that the 2mg daily dose produced statistically significant results in trunk fat reduction over 26-week periods. Some protocols begin with a lower 1mg dose for the first one to two weeks before moving to the full 2mg dose, though this titration approach is less common in the published literature.
Tesamorelin Reconstitution: Step-by-Step Dose Calculation
Tesamorelin typically ships as a lyophilized (freeze-dried) powder in 2mg vials. Before injection, you must reconstitute it with bacteriostatic water (BAC water). The volume of BAC water you add determines the concentration, which in turn determines how many units on an insulin syringe equal your target dose.
Reconstitution Math for 2mg Vials
The formula is straightforward:
Concentration = Peptide Amount / Water Volume
Here are the most practical reconstitution volumes for a 2mg tesamorelin vial:
| BAC Water Added | Concentration | Units for 2mg Dose | Units for 1mg Dose |
|---|---|---|---|
| 1mL (100 units) | 2mg/mL | 100 units (full syringe) | 50 units |
| 2mL (200 units) | 1mg/mL | 200 units (two injections) | 100 units |
| 0.5mL (50 units) | 4mg/mL | 50 units | 25 units |
For most researchers, adding 1mL of BAC water to a 2mg vial is the simplest approach — the entire syringe equals exactly one 2mg dose. If you want two doses per vial (1mg each), add 1mL and draw 50 units per dose.
How to Reconstitute Tesamorelin
- Gather supplies: Tesamorelin 2mg vial, bacteriostatic water, alcohol swabs, insulin syringe (29-31 gauge).
- Clean the vial stoppers on both the tesamorelin vial and the BAC water vial with alcohol swabs.
- Draw your chosen volume of BAC water into the syringe (e.g., 1mL / 100 units).
- Inject the water gently into the tesamorelin vial. Aim the stream at the glass wall — do not spray directly onto the powder, as this can damage the peptide.
- Swirl gently until the powder is fully dissolved. Do not shake the vial. The solution should be clear and colorless.
- Label the vial with the date, concentration (e.g., "2mg/1mL"), and store it in the refrigerator at 2-8 degrees C (36-46 degrees F).
For a deeper walkthrough of reconstitution technique and BAC water handling, see our peptide reconstitution guide.
How to Inject Tesamorelin
Tesamorelin is administered via subcutaneous injection into the abdomen. The abdominal injection site is specifically recommended in the prescribing literature — this is not interchangeable with other common subcutaneous sites like the thigh or deltoid for this particular peptide.
Injection Technique
- Site: Abdomen, at least 2 inches from the navel. Avoid scar tissue, bruises, or areas of skin irritation.
- Needle: 29-31 gauge, half-inch insulin syringe. A 30-gauge needle is the most commonly used.
- Angle: Insert the needle at a 90-degree angle into a pinched fold of skin.
- Rotation: Rotate injection sites within the abdominal area to prevent lipodystrophy at any single spot. Alternate between left and right sides of the abdomen.
- Speed: Inject slowly over 5-10 seconds, then hold the needle in place for an additional 5 seconds before withdrawing.
Proper injection site rotation is particularly important with daily tesamorelin protocols to maintain tissue integrity over longer research periods.
Timing Considerations for Tesamorelin
When you take tesamorelin relative to food and sleep matters for protocol consistency. Research and clinical guidance suggest the following timing principles:
Food Timing
Tesamorelin should be administered on an empty stomach — or at minimum, not within 30 minutes of eating or drinking anything caloric. Food intake, particularly fats and carbohydrates, can blunt the GH pulse that tesamorelin is designed to stimulate. Studies indicate that fasting conditions produce a more robust growth hormone response.
Time of Day
The two most common timing approaches in research protocols are:
- Before bed (most common): Administered 2-3 hours after the last meal, roughly 30-60 minutes before sleep. This aligns the tesamorelin-induced GH pulse with the natural nocturnal GH secretion pattern.
- Morning fasted: Administered upon waking, before breakfast. Wait at least 20-30 minutes before eating.
Consistency matters more than which window you choose. Pick one timing approach and adhere to it throughout the protocol for reproducible results.
Duration of Use
Clinical trials studied tesamorelin over 26-week and 52-week periods. Research suggests that measurable changes in visceral adipose tissue begin appearing around 8-12 weeks, with more pronounced effects at 26 weeks. Most research protocols run 12-26 weeks.
Tesamorelin Storage and Stability
Proper storage directly impacts peptide potency:
- Unreconstituted vials: Store at room temperature (20-25 degrees C / 68-77 degrees F) or refrigerated. Keep away from light.
- Reconstituted vials: Refrigerate at 2-8 degrees C (36-46 degrees F). Use within 20 days of reconstitution when using bacteriostatic water.
- Never freeze reconstituted tesamorelin. Freezing can degrade the peptide and alter its structure.
- Discard any solution that appears cloudy, discolored, or contains particulate matter.
Frequently Asked Questions
How many units on an insulin syringe is 2mg of tesamorelin?
It depends on how much bacteriostatic water you used during reconstitution. If you added 1mL (100 units) of BAC water to a 2mg vial, then 100 units on the syringe equals the full 2mg dose. If you added 0.5mL, then 50 units equals 2mg. Use our reconstitution calculator to find the exact measurement for your specific setup.
Can tesamorelin be injected anywhere other than the abdomen?
The clinical literature and prescribing information specifically recommend abdominal subcutaneous injection for tesamorelin. Unlike many other peptides that can be injected in the thigh or deltoid area, tesamorelin studies were conducted using abdominal sites, and this is the standard administration site referenced in protocols.
What happens if tesamorelin is taken with food?
Research suggests that caloric intake around the time of injection can blunt the growth hormone releasing effect of tesamorelin. Fat and carbohydrate consumption are particularly impactful. For this reason, protocols typically call for administration on an empty stomach — either before bed (2-3 hours post-meal) or first thing in the morning before eating.
How long does a 2mg vial of tesamorelin last?
At the standard 2mg daily dose, one 2mg vial provides exactly one dose. This means a 30-day protocol requires 30 vials. If using a lower 1mg daily dose, one 2mg vial provides two days of dosing. Plan your supply accordingly and consider setting reorder reminders in our Daily Peptide Tracker.