Growth & Performance

Growth Hormone Research Peptides for Sale UK | GHRP & GHRH Research Overview

This collection covers the most published growth hormone (GH) axis research peptides — the compounds researchers use to investigate GH release, IGF-1 signalling, and lean body mass endpoints in animal and clinical models. Every compound is supplied strictly as a research chemical for laboratory investigation.

Two mechanistic classes are represented. GHRPs (Growth Hormone Releasing Peptides) such as GHRP-2 and Ipamorelin act on the ghrelin receptor (GHS-R) in the pituitary in laboratory models, producing pulsed GH release. GHRHs (Growth Hormone Releasing Hormones) such as CJC-1295 and Tesamorelin act on a different receptor — the GHRH receptor — increasing the amplitude of endogenous GH pulses in research models. Combined GHRP + GHRH research has been widely published because the mechanisms are complementary.

Every vial in this collection is tested to ≥98% HPLC purity by an independent laboratory before dispatch, with identity confirmed by mass spectrometry and a batch-specific COA included.

Sold for research use only. Not for human consumption.

GHRP vs GHRH — What the Research Distinguishes

In published research, GHRPs and GHRHs act on separate receptors in the pituitary and follow different pulsatile-release patterns in animal and clinical models. GHRPs such as GHRP-2 activate the ghrelin receptor (GHS-R1a) and produce rapid GH pulses over 15–60 minutes in laboratory subjects. GHRHs such as CJC-1295 activate the GHRH receptor and modulate the amplitude and frequency of endogenous pulses over longer periods.

Because the two receptors are separate, combined GHRP + GHRH research protocols show additive-to-synergistic GH output in published studies. This is why researchers commonly use both classes together in laboratory investigations of the GH axis.

GHRP-2 — Research Overview

GHRP-2 is a six-amino-acid synthetic ghrelin-receptor agonist first published in the early 1990s. In laboratory research, it produces pulsed GH release via activation of GHS-R1a, with peak GH concentrations reached within 15–30 minutes in animal and human clinical models.

GHRP-2 is one of the most published GHRP research compounds and is used as a reference agonist in GH-axis pathway studies.

• Ghrelin-receptor pathway research — used as a reference agonist for GHS-R1a activation studies
• Documented GH pulse response in research models — published preclinical and clinical studies characterise the pulse profile
• IGF-1 downstream pathway research — used in studies investigating IGF-1 induction after GH elevation
• Documented ghrelin-mediated appetite pathway effects — relevant to research on ghrelin-receptor signalling in food-intake models
• Synergy with GHRH analogues in published research — combined GHRP-2 + GHRH studies report additive-to-synergistic GH output
• Over 30 years of published research — one of the longest-studied GHRPs in the literature

Supplied as a 10mg freeze-dried research vial, ≥98% HPLC purity, certificate of analysis included.

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CJC-1295 DAC — Research Overview

CJC-1295 with DAC (Drug Affinity Complex) is a GHRH analogue modified with a maleimide group that allows covalent binding to serum albumin in laboratory subjects. This binding significantly extends its plasma half-life relative to the native GHRH sequence.

In published preclinical research, this extended half-life produces sustained modulation of GH pulse amplitude and frequency over an active window measured in days, making it useful as a research tool for investigating chronic (as opposed to acute-pulse) GH-axis effects.

• GHRH-receptor pathway research — used as a long-acting GHRH agonist reference compound
• Extended half-life via DAC conjugation — the DAC modification enables research on sustained GHRH-receptor activation
• Published body composition endpoints in animal models — preclinical research reports effects on lean mass and fat mass endpoints
• Synergy with GHRP-class agonists in published research — combined GHRP + GHRH studies report additive-to-synergistic GH output
• Reference compound for long-acting GHRH research — the most published DAC-modified GHRH in the research literature

Supplied as a 10mg freeze-dried research vial, ≥98% HPLC purity, certificate of analysis included.

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Ipamorelin — Research Overview

Ipamorelin is a five-amino-acid selective ghrelin-receptor agonist. In published research, it is distinguished from other GHRPs by minimal cross-activity on the pathways governing cortisol and prolactin release at research-relevant concentrations in animal and clinical models.

This selectivity makes Ipamorelin a valuable research tool when isolating GH-axis effects from confounding stress-hormone variables in laboratory studies.

• Selective ghrelin-receptor agonism — used in research to isolate GH-axis effects from cortisol and prolactin variables
• Minimal cortisol and prolactin cross-activity in research — distinguishes it from non-selective GHRPs in comparative studies
• Published preclinical lean-mass endpoints — reference research on GH-axis body composition effects in animal models
• Synergy with GHRH analogues in published research — combined GHRP + GHRH studies report additive-to-synergistic GH output
• The reference selective-GHRP in comparative pathway research — commonly used as a clean control in GH-axis pathway isolation studies

Supplied as a 10mg freeze-dried research vial, ≥98% HPLC purity, certificate of analysis included.

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Tesamorelin — Research Overview

Tesamorelin is a stabilised GHRH analogue with FDA approval as a medicinal product (Egrifta) for a specific HIV-associated lipodystrophy indication. In the research context, its full Phase III clinical trial dataset makes it a reference-standard GHRH compound with the most extensive human pharmacokinetic and safety data of any research peptide in this collection.

Published clinical trials report effects on visceral adipose tissue, IGF-1, and lean body mass endpoints. These references are provided for scientific context only.

Buy Tesamorelin 2mg Research Vial — COA Included →

GH Optimisation Research Stack — GHRP-2 + CJC-1295 DAC

The GH Optimisation Research Stack pairs GHRP-2 (a ghrelin-receptor agonist) with CJC-1295 DAC (a long-acting GHRH analogue). This combination is one of the most widely published GHRP + GHRH pairings in the growth hormone research literature, because the two compounds act on separate receptors and produce additive-to-synergistic GH output in laboratory models.

Supplied at a lower combined price than the individual vials. Both vials meet the same ≥98% HPLC purity standard and each ships with an independent COA.

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Common Research Questions

What are growth hormone research peptides?

GH research peptides are compounds used as tool molecules to investigate the hypothalamic–pituitary–somatotropic axis in animal and clinical research. They fall into two receptor classes: GHRPs (ghrelin-receptor agonists) and GHRHs (GHRH-receptor agonists).

Why are GHRP and GHRH research peptides studied together?

Because they act on separate pituitary receptors, published research shows the combined GH pulse output exceeds either compound alone. This makes combined GHRP + GHRH the reference protocol in many GH-axis research designs.

What is the difference between GHRP-2 and Ipamorelin?

Both are ghrelin-receptor agonists. Ipamorelin is more selective — with minimal cross-activity on cortisol and prolactin pathways at research-relevant concentrations. GHRP-2 produces stronger GH pulses in research but with measurable cortisol and prolactin cross-activity.

What does "DAC" mean in CJC-1295 DAC?

DAC stands for Drug Affinity Complex — a maleimide modification that allows the peptide to bind covalently to serum albumin, extending its plasma half-life significantly relative to the unmodified CJC-1295 sequence.

Why Buy Research Peptides from Pure Grade Labs

• ✓  ≥98% purity — tested by an independent lab before every dispatch
• ✓  Certificate of analysis included — scan the QR code on the vial to verify instantly
• ✓  Identity confirmed by mass spectrometry — every batch, no exceptions
• ✓  UK supply — fast domestic dispatch for laboratory customers
• ✓  Bacteriostatic water available separately — for laboratory reconstitution