---
title: "CJC-1295 vs Ipamorelin vs Tesamorelin: Mechanism, Half-Life, Evidence & FDA Status (2026)"
id: "614"
type: "post"
slug: "growth-hormone-secretagogue-peptides-ghrh-analogs-ghrp-in-laboratory-research-2"
published_at: "2026-09-02T06:05:46+00:00"
modified_at: "2026-08-30T06:31:06+00:00"
url: "https://rplpeptides.com/growth-hormone-secretagogue-peptides-ghrh-analogs-ghrp-in-laboratory-research-2/"
markdown_url: "https://rplpeptides.com/growth-hormone-secretagogue-peptides-ghrh-analogs-ghrp-in-laboratory-research-2.md"
excerpt: "CJC-1295 vs Ipamorelin vs Tesamorelin: Mechanism, Half-Life, Evidence & FDA Status (2026) Direct answer: CJC-1295, Ipamorelin, and Tesamorelin are three different growth-hormone secretagogues with different molecular identities, receptors, pharmacokinetics, and regulatory status. CJC-1295 and Tesamorelin are GHRH-receptor agonists, whereas Ipamorelin..."
taxonomy_category:
  - "RPL Peptide"
---

# CJC-1295 vs Ipamorelin vs Tesamorelin: Mechanism, Half-Life, Evidence & FDA Status (2026)

**Direct answer:** CJC-1295, Ipamorelin, and Tesamorelin are three different growth-hormone secretagogues with different molecular identities, receptors, pharmacokinetics, and regulatory status. CJC-1295 and Tesamorelin are GHRH-receptor agonists, whereas Ipamorelin is a selective GHS-R1a agonist. Tesamorelin is the only FDA-approved drug among the three. CJC-1295 and Ipamorelin are not FDA-approved medicines.

The most important chemical distinction is within CJC-1295 itself: **CJC-1295 with DAC** is an albumin-binding modified GHRH analog, whereas **“CJC-1295 without DAC”** commonly refers to **Modified GRF(1-29)** — a distinct, shorter-acting molecule.

> **Research-use note:** This is an educational comparison of published pharmacology for laboratory researchers. It is not medical advice. CJC-1295 and Ipamorelin are research peptides, not approved medicines. Tesamorelin is an FDA-approved prescription drug and should not be represented as an unapproved research chemical.

---

## Key Findings

1. **Two receptors, one output.** GHRH analogs (CJC-1295, Tesamorelin) signal through cAMP/PKA; the ghrelin-mimetic (Ipamorelin) signals through PLC/IP3/PKC. The two pathways show a **GHRH–GHS-R1a pharmacological interaction** at the pituitary.
2. **CJC-1295 is a GHRH(1-29) derivative, not a 44-mer.** The DAC version is a 30-residue peptide conjugate whose Lys30 carries a maleimidopropionyl group that binds albumin, extending half-life from ~30 min to ~6 days.
3. **“CJC-1295 with DAC” and “without DAC” are different molecules.** The “without DAC” form is chemically **Modified GRF(1-29)**; the DAC form is a distinct albumin-binding conjugate.
4. **Regulatory status is not uniform.** Tesamorelin (Egrifta) is FDA-approved (2010, HIV-associated lipodystrophy); CJC-1295 and Ipamorelin both reached Phase II before discontinuation.
5. **Half-life spans nearly two orders of magnitude** — from Ipamorelin’s ~2 hours to CJC-1295 DAC’s ~6 days.

---

## 1. Entity Definition Table

| Entity | Definition | Key identifier |
| --- | --- | --- |
| CJC-1295 (DAC) | Maleimido derivative of hGRF(1-29) with a Lys30-Nε-maleimidopropionyl albumin-binding moiety | CAS 446262-90-4; PubChem CID 91971820 |
| Modified GRF(1-29) | The 29-residue peptide commonly marketed as “CJC-1295 without DAC” | — |
| Ipamorelin | Pentapeptide GHS-R1a agonist / ghrelin mimetic (Aib-His-D-2-Nal-D-Phe-Lys-NH₂) | CAS 170851-70-4; PubChem CID 20754357 |
| Tesamorelin | [trans-3-hexenoyl]GHRH(1-44) analog | CAS 218949-48-5; PubChem CID 16137828 |
| GHRH-R | Growth-hormone-releasing-hormone receptor | — |
| GHS-R1a | Growth hormone secretagogue receptor type 1a (ghrelin receptor) | — |

> **Identification principle:** Never identify a peptide solely by its commercial name. “CJC-1295 without DAC” is a common research-market name rather than a preferred chemical identifier — the more chemically descriptive designation is **Modified GRF(1-29)**.

---

## 2. Molecular Identity

| Property | Modified GRF(1-29) | CJC-1295 (DAC) | Ipamorelin | Tesamorelin |
| --- | --- | --- | --- | --- |
| Class | GHRH analog | GHRH analog + albumin binder | GHS-R1a agonist / ghrelin mimetic | GHRH analog |
| Peptide residues | 29 | 30 | 5 | 44 |
| DAC modification | None | Lys30 Nε-maleimidopropionyl | None | None |
| Albumin binding | No | Yes | No | No |
| Sequence | H-Tyr-D-Ala²-Asp-Ala-Ile-Phe-Thr-Gln⁸-Ser-Tyr-Arg-Lys-Val-Leu-Ala¹⁵-Gln-Leu-Ser-Ala-Arg-Lys-Leu-Leu-Gln-Asp-Ile-Leu²⁷-Ser-Arg-NH₂ | (29-mer above) + Lys30(Nε-maleimidopropionyl) | Aib-His-D-2-Nal-D-Phe-Lys-NH₂ | [trans-3-hexenoyl]GHRH(1-44)-NH₂ |
| Molecular weight | ≈ 3.4 kDa | 3,647 Da | 711.87 Da | ≈ 5,136 Da |
| Molecular formula | — (29-mer) | C₁₆₅H₂₆₉N₄₇O₄₆ | C₃₈H₄₉N₉O₅ | C₂₂₁H₃₆₆N₇₂O₆₇S |
| CAS | — | 446262-90-4 | 170851-70-4 | 218949-48-5 |
| PubChem CID | — | 91971820 | 20754357 | 16137828 |
| Half-life (human) | ~30 min | ~6 days (5.8–8.1 d) | ~2 h | Formulation-dependent (see §5) |
| Receptor | GHRH-R | GHRH-R | GHS-R1a | GHRH-R |
| Regulatory status | Research peptide | Research peptide (Phase II discontinued) | Research peptide (Phase II discontinued) | FDA-approved (Egrifta) |

> **Note:** Molecular weights above are for the free-base forms indexed in PubChem. Actual molecular mass can differ depending on the salt/counterion form (e.g., acetate or TFA) specified by the supplier — a distinction that matters for molar concentration calculations.

---

## 3. CJC-1295: The Long-Acting GHRH Analog

### 3.1 Structure

CJC-1295 is a modified form of **GHRH(1-29)** (sermorelin) carrying four substitutions — **D-Ala², Gln⁸, Ala¹⁵, Leu²⁷** — that reduce proteolytic degradation. It was developed by ConjuChem Biotechnologies. PubChem (CID 91971820) describes the DAC form as a **maleimido derivative of hGRF(1-29)**.

### 3.2 The DAC Mechanism

The long half-life comes from a **Drug Affinity Complex (DAC)** — a maleimidopropionyl-based albumin-binding modification — not from the peptide sequence itself:

1. A maleimide-containing linker is attached to the C-terminus (Lys30).
2. The maleimide forms a covalent bond with cysteine-34 of serum albumin.
3. The peptide circulates with albumin, releasing active peptide gradually.
4. Result: human half-life ≈ **5.8–8.1 days** (vs ~30 min without the DAC moiety).

### 3.3 Pharmacokinetics & Clinical History

In a single human study (Teichman et al. 2006), a single CJC-1295 DAC dose raised GH **approximately 2- to 10-fold** and IGF-1 **approximately 1.5- to 3-fold**. These figures come from **one small study** and should be read as illustrative, not definitive.

CJC-1295 reached **Phase II** for lipodystrophy and GH deficiency. The program was halted after a participant died: contemporary reporting indicated the attending physician considered previously undiagnosed coronary artery disease with plaque rupture the most likely cause and **did not attribute the event to CJC-1295**; the sponsor nevertheless terminated development as a precaution.

### 3.4 Why “with DAC” vs “without DAC” Matters

The two forms are chemically distinct and not interchangeable:

|  | Modified GRF(1-29) | CJC-1295 (DAC) |
| --- | --- | --- |
| C-terminal | Ser-Arg-NH₂ | Ser-Arg-Lys30(Nε-maleimidopropionyl)-NH₂ |
| Half-life | ~30 min | 5.8–8.1 days |
| Dosing frequency in research | Frequent | Infrequent |

A research buyer should confirm which form is being supplied — the commercial name “CJC-1295” alone does not specify this, and the two forms have materially different pharmacokinetics.

---

## 4. Ipamorelin: The Selective GHS-R1a Agonist

### 4.1 Structure

Ipamorelin (Novo Nordisk; development code NNC 26-0161) is a **pentapeptide** — `Aib-His-D-2-Nal-D-Phe-Lys-NH₂` — derived from GHRP-1. It is a selective agonist of the **growth hormone secretagogue receptor type 1a (GHS-R1a)**.

### 4.2 Mechanism

GHS-R1a activation couples to **Gq/11 → PLC → IP3/DAG → Ca²⁺ release + PKC → GH exocytosis**. GHS-R1a activation provides a signaling route that is **pharmacologically distinct from GHRH receptor activation** and can interact with the somatostatin-regulated GH axis — a different entry point than the cAMP/PKA pathway used by GHRH analogs.

### 4.3 Selectivity Profile (reported)

Ipamorelin’s defining feature is reported selectivity — in original characterization studies (Raun et al. 1998) it stimulated GH **without significant effect on prolactin, ACTH, cortisol, FSH, LH, or TSH**. The following is a **qualitative summary**, not a quantitative ranking:

| Parameter | Ipamorelin | GHRP-2 | GHRP-6 | Hexarelin |
| --- | --- | --- | --- | --- |
| GH release | High | High | High | High |
| Cortisol | Minimal | Moderate | Moderate | Moderate |
| Prolactin | Minimal | Low | Low | Low |
| Appetite | Low | Moderate | High | Moderate |

Its elimination half-life is **~2 hours** (Gobburu et al. 1999). Clinical development for postoperative ileus was **discontinued after Phase II studies failed to demonstrate sufficient efficacy** (Beck et al. 2014).

---

## 5. Tesamorelin: The Approved GHRH Analog

Tesamorelin is **GHRH(1-44)** carrying a **trans-3-hexenoyl** group at the N-terminal tyrosine. It activates the GHRH receptor and **promotes endogenous GH secretion**, with downstream increases in IGF-1. It is the only compound in this comparison with an **FDA-approved drug product**: **Egrifta (tesamorelin for injection)** was **approved November 10, 2010** for reduction of excess abdominal fat in adults with HIV-associated lipodystrophy, on the basis of Phase 3 data (Falutz et al. 2007).

> **Half-life note:** Tesamorelin pharmacokinetics vary by formulation and study population. Earlier EGRIFTA labeling reported mean elimination half-lives of approximately **26 minutes in healthy subjects** and **38 minutes in HIV-infected patients**, while the current **EGRIFTA WR** label reports approximately **11 minutes** after a single 1.28 mg subcutaneous dose. A single generic half-life should not be applied across all tesamorelin formulations.

> **Regulatory note:** Tesamorelin’s approval is indication-specific (HIV-associated lipodystrophy). Approval does not extend to other uses. Any commercial or research handling should comply with applicable drug and local regulatory requirements.

---

## 6. Head-to-Head Comparison

| Dimension | CJC-1295 DAC | Ipamorelin | Tesamorelin |
| --- | --- | --- | --- |
| Receptor | GHRH-R | GHS-R1a | GHRH-R |
| Signaling | cAMP/PKA | PLC/IP3/PKC | cAMP/PKA |
| Half-life | 5.8–8.1 days | ~2 h | Formulation-dependent (11–38 min) |
| GH pattern | Prolonged elevation | Pulsatile | Endogenous secretion |
| IGF-1 induction | Sustained (days) | Moderate | Sustained |
| Selectivity | GH axis | Relatively selective for GH | GH axis |
| Regulatory | Phase II discontinued | Phase II discontinued | FDA-approved (Egrifta) |

### 6.1 The GHRH–GHS-R1a Pharmacological Interaction

Experimental studies have demonstrated **supra-additive GH responses** when GHRH and GHRP/GHS-R agonism are combined (Veldhuis & Bowers 2003). This is a **laboratory observation about pituitary signaling**, not a therapeutic recommendation — combination research investigates mechanism, not clinical benefit.

---

## 7. Clinical Evidence Snapshot

| Compound | Human PK/PD | Clinical trials | Completed efficacy evidence | FDA approval |
| --- | --- | --- | --- | --- |
| CJC-1295 DAC | Yes | Phase II | No (discontinued) | No |
| Ipamorelin | Yes | Phase II | Negative/insufficient (POI) | No |
| Tesamorelin | Yes | Phase III | Yes (HIV lipodystrophy) | Yes |

This table separates **pharmacology** (human PK/PD data exist for all three) from **efficacy evidence** (only Tesamorelin has a completed pivotal program). The two research peptides reached early clinical stages but do not have approved indications.

---

## 8. Evidence Type Framework

> **RPL Peptides Evidence Framework.** The levels below are an **editorial framework used in this article** and are **not equivalent to GRADE, Oxford CEBM, FDA evidence classifications, or any other formal regulatory evidence system.** Chemical identity data (sequence, molecular weight, formula) are drawn from authoritative databases (PubChem, CAS, FDA records) rather than from an evidence tier.

| Level | Definition |
| --- | --- |
| A | Regulatory / approved-product evidence |
| B | Human randomized / controlled clinical evidence |
| C | Human PK/PD evidence |
| D | Replicated preclinical / biochemical evidence |
| E | Limited or single-group preclinical evidence |

| Claim | Evidence level |
| --- | --- |
| Tesamorelin FDA approval (indication-specific) | A |
| Tesamorelin Phase 3 efficacy (HIV lipodystrophy) | B |
| CJC-1295 half-life 5.8–8.1 days; GH/IGF-1 elevation | C |
| Ipamorelin half-life ~2 h | C |
| Ipamorelin selectivity (no cortisol/ACTH) | D |
| GHRH–GHS-R1a supra-additive GH response | D |
| CJC-1295 / Ipamorelin Phase II discontinuation | A–B (trial/company records) |

**Regulatory status** is treated as a separate dimension from biological evidence — approval reflects a regulatory determination, not a scientific efficacy claim.

---

## 9. Quality Specifications (Typical Targets, Not Universal Standards)

The values below are **typical supplier targets for research-grade material**, not universal regulatory standards. Thresholds vary by supplier, application, and analytical method — verify against each product’s Certificate of Analysis (COA).

| Parameter | Typical approach | Method |
| --- | --- | --- |
| Purity | ≥ 99% (commonly requested) | RP-HPLC (214 nm) |
| Mass identity | Consistent with theoretical/expected mass within method-specific tolerance | LC-MS / HRMS / MALDI-TOF as appropriate |
| Peptide content | 70–90% net peptide | Amino acid analysis |
| Water | < 5% | Karl Fischer |
| Endotoxin | Application-specific acceptance limit | LAL or recombinant Factor C |

> **Purity ≠ peptide content.** HPLC purity and net peptide content are different measurements. Net peptide content is lower than chromatographic purity because the gross powder weight includes counterions (acetate/TFA), residual water, and residual solvents — a distinction that matters when calculating molar concentrations.

For interpretation guidance: [COA interpretation guide](https://data.rplpeptides.com/guides/peptide-coa-interpretation-guide)
 · [HPLC interpretation guide](https://data.rplpeptides.com/guides/peptide-hplc-interpretation-guide)
 · [white paper on reading a COA](https://data.rplpeptides.com/white-papers/how-to-read-a-coa)
.

---

## 10. Buyer Checklist: What to Ask the Manufacturer

1. **Exact molecule** — confirm whether CJC-1295 is the DAC or “without DAC” (Modified GRF 1-29) form; they are different products with different half-lives.
2. **Sequence and molecular weight** — request MS-confirmed identity consistent with the theoretical mass, and the salt/counterion form (especially the Ipamorelin pentapeptide).
3. **Purity result and method** — ask for the actual chromatographic purity result and method; ≥ 99% is a commonly requested research-grade specification, but the appropriate acceptance criterion depends on the application.
4. **Peptide content vs. gross weight** — account for counterion (TFA/acetate), residual water, and residual solvents; HPLC purity is not net peptide content.
5. **Endotoxin result** — ask for the actual value and confirm it meets the requirements of the intended experimental system.
6. **Lot traceability** — a unique lot number through synthesis → purification → QC.
7. **Storage** — compound-specific: confirm the recommended temperature per the product COA (lyophilized material is commonly stored at −20 °C, but verify per compound).
8. **Regulatory framing** — confirm “research use only” labeling for unapproved compounds; reject any therapeutic representation.

---

## 11. Frequently Asked Questions

**What is the difference between GHRH analogs and GHRP?**  
GHRH analogs (CJC-1295, Tesamorelin) act at the pituitary GHRH receptor via cAMP/PKA. GHRPs (Ipamorelin) act at the ghrelin receptor (GHS-R1a) via PLC/IP3/PKC. The two systems interact pharmacologically.

**What does DAC mean in CJC-1295?**  
DAC (Drug Affinity Complex) is a maleimidopropionyl-based albumin-binding modification on Lys30 that extends half-life from ~30 min to ~6 days.

**Is CJC-1295 a 44-amino-acid peptide?**  
No. CJC-1295 is a modified GHRH(1-29) — a 29-residue peptide (or a 30-residue conjugate with the DAC moiety). The 44-amino-acid peptide is Tesamorelin (GHRH 1-44).

**Is “CJC-1295 without DAC” the same as Modified GRF(1-29)?**  
Yes in market practice, but the preferred chemical identifier is Modified GRF(1-29); “CJC-1295 without DAC” is a common research-market name.

**Is any of these FDA-approved?**  
Tesamorelin (Egrifta) is FDA-approved for HIV-associated lipodystrophy. CJC-1295 and Ipamorelin are unapproved research peptides whose clinical programs were discontinued.

**What is Ipamorelin’s half-life?**  
~2 hours — suitable for pulsatile GH protocols with low desensitization risk.

**Can CJC-1295 and Ipamorelin be combined?**  
Their mechanisms show a supra-additive GH interaction in experimental studies; combination research investigates this mechanism. This is a laboratory observation, not a therapeutic recommendation.

---

## 12. Research Materials & Documentation

Product and reference pages, separated from the mechanism discussion above:

**Cornerstone & guides (main site):**

- [What Is a Research Peptide?](https://rplpeptides.com/what-is-research-peptide/)
- [Peptide Quality Control — Analytical Methods](https://rplpeptides.com/peptide-quality-control/)
- [How to Source Peptides from China](https://rplpeptides.com/how-to-source-peptides-from-china/)
- [Peptide Stability & Preservation Guide](https://rplpeptides.com/peptide-stability-preservation-guide/)
- [How to Reconstitute Peptides — Protocol](https://rplpeptides.com/how-to-reconstitute-peptides-protocol/)

**Related research comparisons:**

- [Semaglutide vs Tirzepatide vs Retatrutide: A Research Comparison](https://rplpeptides.com/semaglutide-vs-tirzepatide-vs-retatrutide-research-comparison/)
- [GLP-1 Peptide Regulatory Status by Country](https://rplpeptides.com/glp-1-peptide-regulatory-status-by-country/)

**Product & data pages:**

- [CJC-1295 Supplier](https://rplpeptides.com/cjc1295-peptide-supplier-china/) · [CJC-1295 documentation](https://data.rplpeptides.com/cjc1295/cjc1295-complete-documentation)
- [Ipamorelin](https://rplpeptides.com/ipamorelin-peptide/) · [Ipamorelin documentation](https://data.rplpeptides.com/ipamorelin/ipamorelin-complete-documentation)
- [Tesamorelin Manufacturer](https://rplpeptides.com/tesamorelin-manufacturer-rpl-peptide-china/) · [Tesamorelin documentation](https://data.rplpeptides.com/tesamorelin/tesamorelin-complete-documentation)

---

## References

1. Jetté L, Léger R, Thibaudeau K, et al. “Human growth hormone-releasing factor (hGRF)1-29-albumin bioconjugates activate the GRF receptor on the anterior pituitary in rats: identification of CJC-1295 as a long-lasting GRF analog.” *Endocrinology*. 2005;146(7):3052–3058. PMID: 15817669.
2. Teichman SL, Neale A, Lawrence B, et al. “Prolonged stimulation of growth hormone (GH) and insulin-like growth factor I secretion by CJC-1295, a long-acting analog of GH-releasing hormone, in healthy adults.” *Journal of Clinical Endocrinology & Metabolism*. 2006;91(3):799–805. PMID: 16352683.
3. Ionescu M, Frohman LA. “Pulsatile secretion of growth hormone (GH) persists during continuous stimulation by CJC-1295, a long-acting GH-releasing hormone analog.” *Journal of Clinical Endocrinology & Metabolism*. 2006;91(12):4792–4797. PMID: 17018654.
4. Alba M, Fintini D, Sagazio A, et al. “Once-daily administration of CJC-1295, a long-acting growth hormone-releasing hormone (GHRH) analog, normalizes growth in the GHRH knockout mouse.” *American Journal of Physiology — Endocrinology and Metabolism*. 2006;291(6):E1290–1294. PMID: 16822960.
5. Raun K, Hansen BS, Johansen NL, et al. “Ipamorelin, the first selective growth hormone secretagogue.” *European Journal of Endocrinology*. 1998;139(5):552–561. PMID: 9849822.
6. Gobburu JV, Agersø H, Jusko WJ, Ynddal L. “Pharmacokinetic-pharmacodynamic modeling of ipamorelin, a growth hormone releasing peptide, in human volunteers.” *Pharmaceutical Research*. 1999;16(9):1412–1416. PMID: 10496658.
7. Johansen PB, Nowak J, Skjaerbaek C, et al. “Ipamorelin, a new growth-hormone-releasing peptide, induces longitudinal bone growth in rats.” *Growth Hormone & IGF Research*. 1999;9(2):106–113. PMID: 10373343.
8. Beck DE, Sweeney WB, McCarter MD. “Prospective, randomized, controlled, proof-of-concept study of the ghrelin mimetic ipamorelin for the management of postoperative ileus in bowel resection patients.” *International Journal of Colorectal Disease*. 2014;29(12):1527–1534. PMID: 25331030.
9. Falutz J, Allas S, Blot K, et al. “Metabolic effects of a growth hormone-releasing factor in patients with HIV.” *New England Journal of Medicine*. 2007;357(23):2359–2370. PMID: 18057338.
10. Bowers CY. “Growth hormone-releasing peptide (GHRP).” *Cellular and Molecular Life Sciences*. 2012;69(13):2145–2157.
11. Veldhuis JD, Bowers CY. “Determinants of GH-releasing hormone and GH-releasing peptide synergy in men.” *Journal of Clinical Endocrinology & Metabolism*. 2003;88(6):2820–2828.
12. Kojima M, Kangawa K. “Ghrelin: structure and function.” *Physiological Reviews*. 2005;85(2):495–522.
13. Alaiha M, Aschner P. “Tesamorelin: a review of clinical experience.” *Expert Opinion on Biological Therapy*. 2019;19(6):537–545.
14. U.S. Food and Drug Administration. Egrifta (tesamorelin for injection) approval (November 10, 2010) and current DailyMed labeling.
15. National Center for Biotechnology Information. PubChem CID 91971820 (CJC-1295); CID 20754357 (Ipamorelin); CID 16137828 (Tesamorelin). Accessed 2026-08-30.

---

*For laboratory sourcing or OEM supply of research peptides, [contact RPL Peptide](https://rplpeptides.com/contact/)
.*

> **Disclaimer:** This article is for informational and research-context purposes only. It is not medical advice. CJC-1295 and Ipamorelin are research peptides not evaluated by the FDA for safety or efficacy. Tesamorelin (Egrifta) is an FDA-approved prescription drug; statements about its clinical use reflect published trial data and labeling. All mechanistic statements reflect published pharmacology and carry the evidence-level caveats noted above.

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