Ipamorelin: Reference Overview and Reconstitution Notes

Ipamorelin is a man-made peptide (a short chain of five amino acids) that acts on the growth hormone secretagogue receptor, the same receptor targeted by ghrelin (a natural hunger hormone). It is not approved by the FDA for any use, and it is banned in sport by the World Anti-Doping Agency (WADA).

What it is

Ipamorelin is a synthetic pentapeptide (a man-made chain of exactly five amino acids, the building blocks of proteins). Its chemical sequence is Aib-His-D-2-Nal-D-Phe-Lys-NH2. It acts as an agonist at the growth hormone secretagogue receptor (GHSR-1a). An agonist is a molecule that activates a receptor, much like a key fitting a specific lock. This is the same receptor that the natural hormone ghrelin targets. Ipamorelin belongs to the growth hormone releasing peptide (GHRP) family and is often described as one of the more selective compounds in that group.

Research context and categorization

Ipamorelin is generally grouped under the growth hormone secretagogue category. A secretagogue is simply a substance that triggers the release of another substance. Other compounds in this group include GHRP-2, GHRP-6, and hexarelin. In research, it is studied for how it stimulates the pituitary gland (a small gland at the base of the brain) to release growth hormone through the ghrelin receptor pathway.

One thing often highlighted about Ipamorelin is its reported selectivity. Think of selectivity like a precise tool that does one specific job, rather than a broad tool that affects many things at once. Research suggests it triggers growth hormone release with comparatively little effect on cortisol (a stress hormone) or prolactin (another hormone) compared to some older peptides in the same class.

Because it is not FDA-approved, any uses described for Ipamorelin are investigational (meaning they are still being studied and have not been confirmed or approved). The research evidence is limited, coming largely from small or short-term studies. The original developer also stopped its therapeutic development.

Long-term questions about chronic receptor activation, effects on glucose (blood sugar) metabolism, and overall safety remain open and unanswered in published research.

Key point: Ipamorelin is not FDA-approved, and its therapeutic development was discontinued, leaving long-term safety and effectiveness questions unresolved in published literature.

Status

• Regulatory status: Not FDA-approved for any indication. It is handled as a research-only compound in the United States and is not authorized as a therapeutic drug.
• Sport status: Prohibited under the WADA Prohibited List at all times, in and out of competition, under class S2 (peptide hormones, growth factors, related substances, and mimetics). Growth hormone secretagogues are named explicitly within this class.

Reconstitution notes (general)

Reconstitution means mixing a dry powder with liquid to make a solution. The math is simple. Concentration equals the milligrams of peptide in the vial divided by the milliliters of bacteriostatic water added. For example, a 5 mg vial mixed with 2 mL of bacteriostatic water gives a solution of 2.5 mg/mL.

Use the reconstitution calculator at peptide calculator to convert a target volume into a concentration.

Dilution and handling notes (compound-specific)

Ipamorelin ships as a lyophilized (freeze-dried) powder that must be mixed with bacteriostatic water before lab use. Think of it like a freeze-dried soup packet: the water brings it back to a usable form. It is a small, water-soluble peptide and usually dissolves quickly into a clear, colorless solution within about a minute.

It does not typically gel, cloud, or leave lasting particles the way some larger or less soluble peptides can. Cloudiness or persistent particles after mixing are a sign to discard the solution. That is not a normal state to work through.

Reconstitution Ratios

For a 5 mg vial, typical water amounts range from about 2 mL to 5 mL. For a 2 mg vial, smaller volumes such as 0.5 mL to 1 mL are often used.

As an example, 5 mg in 2 mL gives 2.5 mg/mL, while 2 mg in 0.5 mL gives 4 mg/mL. The peptide dissolves well across that range, so the amount of water is mainly a matter of measurement convenience rather than a solubility requirement.

Handling and Mixing Instructions

To keep the compound stable, follow these handling steps:

• Add water slowly: Aim the stream against the glass wall of the vial, not directly onto the powder. This reduces mechanical stress and foaming.
• Do not shake or vortex: Swirl or roll the vial gently until the powder is fully dissolved. Vigorous shaking can foam the solution and cause peptide aggregation (clumping of the peptide molecules).
• Protect from light: Once in solution, Ipamorelin is sensitive to light and heat. Use an amber vial or store it away from direct light to limit breakdown.

Handling and storage

To keep the product in good condition, follow these storage guidelines:

• Store reconstituted solution in a refrigerator at 2 to 8 degrees Celsius and keep it away from light.
• Wipe the rubber stopper with alcohol before each puncture.
• Label the vial with the mix date and use it within the general four-week (roughly 28-day) refrigerated window for reconstituted material.
• Discard any vial whose contents have turned cloudy or discolored, or that shows floaters or particles.

Related reading

• Kisspeptin
• KPV
• Livagen
• How Reconstitution Works
• How Long Does a Reconstituted Vial Last?

Tools and supplies

• peptide calculator
• Bacteriostatic Water 30 ml
• Gansulin Metal Reusable Pen
• 3 ml Glass Cartridges (10-pack)
• Complete Starter Kit

Reminder: research and educational reference only. Preppin Peppers sells hardware and materials, not peptides. Not medical, dosing, or health advice, not evaluated by the FDA, and not intended for human or animal use.

Frequently asked questions

What is the chemical structure and receptor target of Ipamorelin?

Ipamorelin is a pentapeptide with the sequence Aib-His-D-2-Nal-D-Phe-Lys-NH2. It acts as an agonist at the growth hormone secretagogue receptor (GHSR-1a), the same receptor targeted by the natural hormone ghrelin.

What is the regulatory and sport status of Ipamorelin?

Ipamorelin is not FDA-approved for any indication and is handled as a research-only compound in the US. It is prohibited by WADA at all times under class S2 (peptide hormones, growth factors, and mimetics).

How is Ipamorelin concentration calculated after reconstitution?

Divide the peptide mass in milligrams by the volume of bacteriostatic water added in milliliters. Example: a 5 mg vial dissolved in 2 mL yields 2.5 mg/mL. A peptide calculator can convert target volume to concentration.

What the research community gets wrong about Ipamorelin

• "Selective" is about receptor signaling, not about the vial. In the literature, selectivity means the peptide triggers growth hormone release with little effect on cortisol or prolactin at the receptor. It says nothing about how the powder or the solution behaves at your bench. Do not read "selective" as "more stable" or "easier to handle."
• It does not handle like every other GHRP. Ipamorelin is a small, water-soluble pentapeptide that usually goes into a clear, colorless solution within about a minute. Bigger or less soluble peptides can gel, cloud, or leave particles. Copying a handling routine from a different compound can lead you to misread a normal vial (or miss a bad one).
• "Research-only" is not the same as "well characterized." Ipamorelin is not FDA-approved, and the published record is limited, coming largely from small or short-term studies. The original developer also stopped its therapeutic program. Treat it as an incompletely studied reference compound, not a settled one.
• More water does not mean better dissolving. Because this peptide dissolves well across a wide range of bacteriostatic water volumes, the amount you add is mostly a matter of measurement convenience, not a solubility requirement. Picking an odd volume to "help it dissolve" adds nothing.
• A clear solution is not proof the peptide is intact. Clarity confirms the powder dissolved. It does not confirm the molecule survived shaking, light, or heat. Gentle swirling, amber or shaded storage, and cold temperatures still matter after the solution looks clear.

From our bench: If you reconstitute an Ipamorelin vial, we would like your real timing and clarity notes. Record the vial mass (mg), the exact volume of bacteriostatic water you added (mL), the temperature of the water, and how many seconds of gentle swirling it took to reach a clear, colorless, particle-free solution. If you tracked the same vial over its refrigerated storage window, note the day and whether clarity held. Send your own measured values only, with no rounding to match ours.

Sources

1. Bacteriostatic Water for Injection, USP , FDA/DailyMed label (0.9% benzyl alcohol)
2. Duerkop et al., Biotechnol J 2018 , Impact of Cavitation, High Shear Stress and Air/Liquid Interfaces on Protein Aggregation
3. Sigma-Aldrich (Merck) , Handling and Storage Guidelines for Peptides and Proteins
4. PubChem, Ipamorelin (CID 9831659), NIH National Library of Medicine
5. Raun K, et al. Ipamorelin, the first selective growth hormone secretagogue. Eur J Endocrinol. 1998;139(5):552-61 (PMID 9849822)