In the realm of competitive sports, athletes pursue relentless improvements in athletic performance. From nutritional supplementation to optimized training methods, from physical therapy to psychological interventions, humanity continually pushes the boundaries of physiological limits. In recent years, Growth Hormone-Releasing Peptide-2 (GHRP-2 Injection) has emerged as a research hotspot in sports medicine due to its unique mechanism of regulating endogenous growth hormone (GH) secretion.
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| Certificate of Analysis | ||
| Compound name | GHRP-2 | |
| CAS No. | 158861-67-7 | |
| Quantity | 20g | |
| Package | PE bag+Al foil bag | |
| Manufacturer | Shaanxi BLOOM TECH Co., Ltd | |
| Lot No. | 2025012015 | |
| MFG | Dec 15th 2025 | |
| EXP | Dec 15th 2027 | |
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| Test standard | GB/T24768-2009 Industry. Standard | |
| Item | Enterprise standard | |
| Appearance | White to beige | |
| Water content | ≤5.0% | |
| Heavy Metals | Pb≤0.5ppm | |
| As≤0.5ppm | ||
| Hg≤0.5ppm | ||
| Cd≤0.5ppm | ||
| Purity (HPLC) | ≥99.61% | |
| Single impurity | <0.5% | |
| Total microbial count | ≤300cfu/g | |
| E. Coli | ≤2MPN/g | |
| Salmonella | N.D. | |
| Ethanol (by GC) | ≤1500ppm | |
| Storage | Store in a sealed, dark and dry place at 2-8 degrees | |
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| Chemical Formula: | C42H50N8O5 | |
| Exact Mass: | 746.39 | |
| Molecular Weight: | 746.91 | |
| m/z: | 746.39 (100.0%), 747.39 (45.4%), 748.40 (10.1%), 747.39 (3.0%), 748.39 (1.3%), 748.39 (1.0%) | |
| Elemental Analysis: | C, 67.54; H, 6.75; N, 15.00; O, 10.71 | |
Molecular Properties
Chemical Nature and Receptor Binding Mechanism
GHRP-2 is a synthetic hexapeptide composed of six amino acids, belonging to the second-generation growth hormone-releasing peptide (GHRP) family. Its structure bears a high similarity to natural ghrelin, enabling it to bind with high affinity to the growth hormone-releasing peptide receptor (GHSR-1a) on the hypothalamus and pituitary gland. Experiments demonstrate that GHRP-2 binding to GHSR-1a induces calcium influx in pituitary cells, activates the protein kinase C (PKC) pathway, and ultimately promotes GH gene transcription and secretion.
Suppression of Somatostatin and Enhancement of GHRH Signaling
GHRP-2 regulates GH secretion through dual pathways: it directly suppresses somatostatin (SS) neuron activity in the hypothalamic arcuate nucleus, reducing SS secretion and lifting its inhibition on pituitary GH release. Simultaneously, it enhances growth hormone-releasing hormone (GHRH) receptor expression and signal transduction efficiency, significantly increasing pituitary cell sensitivity to GHRH. Animal studies demonstrate that co-administration of GHRP-2 with GHRH analogues (e.g., CJC-1295) increases GH secretion by over 300% compared to monotherapy.
Promoting Muscle Regeneration
Driving Protein Synthesis
GH activates the mTOR signaling pathway within skeletal muscle cells by stimulating hepatic production of insulin-like growth factor-1 (IGF-1), thereby promoting ribosomal biosynthesis and protein translation. Research from the Institute of Zoology, Sichuan University indicates that exogenous GHRP-2 significantly elevates serum IGF-1 levels in rats and enhances IGF-1 mRNA expression in liver and skeletal muscle. This leads to a 12%-15% increase in muscle fiber diameter and an 8%-10% expansion in skeletal muscle area.
Improving the Repair Microenvironment
Following muscle injury, local inflammatory responses (e.g., elevated TNF-α and IL-6) inhibit the proliferation and differentiation of satellite cells (muscle stem cells). GHRP-2, by elevating GH levels, inhibits NF-κB pathway activation, reduces pro-inflammatory factor release, and promotes anti-inflammatory factors (e.g., IL-10). Preclinical studies show GHRP-2 treatment reduces inflammatory infiltration area by 40% and increases satellite cell activation rate by 25% in rat muscle injuries.
Improving Energy Metabolism
Muscle regeneration relies on mitochondrial energy supply, yet aging or injury leads to mitochondrial morphological abnormalities and functional decline. A Stanford University team discovered that inhibiting 15-PGDH (prostaglandin E2 degrading enzyme) restores mitochondrial morphology and function in aged mouse muscles. GHRP-2, by elevating GH levels, indirectly upregulates PGE2 levels, triggering mitochondrial biogenesis. Transmission electron microscopy revealed that GHRP-2 treatment increased intermuscular mitochondrial density by 30% in aged mice, restoring their morphology to compact, spherical forms resembling those in young mice.
Enhancing Athletic Performance
Animal Studies: In a Yanan pig model, intramuscular injection of 20 μg/kg GHRP-2 every other day increased daily weight gain by 4.78% throughout the entire period, reduced the feed-to-weight ratio by 6.77%, and improved apparent protein utilization by 13.64%. This finding indirectly supports GHRP-2's role in promoting muscle synthesis.
Human Trials: Clinical studies indicate GHRP-2 treatment increased subjects' grip strength by 15%, squat weight by 10%, and reduced body fat percentage by 5%-7%. This mechanism is closely linked to IGF-1's role in promoting lipolysis and regulating glucose metabolism. For instance, in endurance athletes, GHRP-2 prolongs exercise duration by enhancing fat oxidation while reducing muscle glycogen depletion.
Accelerated Post-Exercise Muscle Repair
Exercise-induced microdamage to muscles causes sarcolemmal rupture in myofibers, triggering localized inflammation and oxidative stress. GHRP-2 shortens the repair cycle through the following pathways:
Activating satellite cells: Satellite cells are skeletal muscle stem cells whose activation depends on Pax7 gene expression. GHRP-2 enhances mTOR pathway activity, upregulates ribosomal protein S6 kinase (S6K1) expression, and accelerates myosin synthesis. Simultaneously, it inhibits myostatin (MSTN), relieving its suppression of satellite cells. For example, in C2C12 myoblasts stimulated by GHRP-2, Myogenin expression increased threefold, and myotube formation efficiency improved by 50%.
Anti-inflammatory and antioxidant effects: GHRP-2 reduces levels of pro-inflammatory factors such as TNF-α and IL-6 by inhibiting the NF-κB pathway. Simultaneously, it upregulates SOD and GPx activity, reducing ROS accumulation and protecting myocyte membrane integrity. In an arthritis rat model, 8 consecutive days of GHRP-2 treatment significantly reduced serum IL-6 levels and decreased nitrite/nitrate release from peritoneal macrophages.
Long-term high-intensity training often leads to decreased bone density and joint wear. GHRP-2 increases bone density by 8%-10% in elderly patients through promoting bone formation and inhibiting bone resorption, thereby reducing fracture risk. Its anti-inflammatory effects also alleviate exercise-induced joint pain, enhancing training continuity. For instance, in marathon runners, GHRP-2 treatment increased knee cartilage thickness by 12% and reduced post-exercise joint swelling incidence by 40%.
Improve bone density and joint health
GHRP-2 indirectly improves bone density and joint health by promoting the secretion of growth hormone (GH) and insulin-like growth factor-1 (IGF-1). The specific mechanisms are as follows:
Mechanism for Improving Bone Density
Promoting GH Secretion: GHRP-2 mimics the activity of endogenous ghrelin to stimulate anterior pituitary cells to release GH. GH is a key hormone regulating bone metabolism, promoting bone formation while inhibiting bone resorption, thereby contributing to increased bone density.
Upregulating IGF-1 Expression: GH triggers liver production of IGF-1, a core growth factor for muscle regeneration that is also vital for skeletal health. IGF-1 promotes proliferation and differentiation of osteoblasts while enhancing bone matrix formation, thereby supporting bone density improvement.
Inhibition of Bone Resorption: GHRP-2 may indirectly suppress osteoclast activity by regulating levels of related hormones and cytokines, thereby reducing bone resorption and helping maintain or increase bone density.
Mechanisms for Improving Joint Health
Promotion of Cartilage Repair: By stimulating GH and IGF-1 secretion, GHRP-2 may aid in the proliferation and differentiation of chondrocytes, promoting cartilage repair and regeneration. This is crucial for joint health, as cartilage serves as the protective layer on joint surfaces, reducing friction and cushioning impacts.
Anti-inflammatory Effects: GHRP-2 exhibits anti-inflammatory properties, reducing inflammatory responses within joints and alleviating joint swelling and pain. This is particularly significant for individuals with joint disorders such as arthritis.
Enhanced Muscle Strength: GHRP-2 promotes muscle growth and strength gains, thereby helping stabilize joints and reduce the risk of joint injury. Stronger muscles provide better support and protection for joints.
Considerations in Practical Application
Individual Variability: Responses to GHRP-2 may vary among individuals. Some studies indicate that its effects on promoting GH secretion and improving bone density may differ based on factors like age, gender, and overall health status.
Dosage Regimen: The administration protocol for GHRP-2 (including dosage, frequency, and duration) may influence its efficacy. An inappropriate regimen could lead to side effects or suboptimal results.
Safety: While GHRP-2 shows potential for improving bone density and joint health, its safety profile requires further evaluation. Long-term use may carry potential risks, such as blood sugar fluctuations and elevated cortisol levels.
Common Side Effects
GHRP-2 functions by stimulating growth hormone (GH) secretion, but its side effects warrant attention, particularly as risks may escalate with prolonged or improper use. Common side effects include:
Injection Site Reactions
Redness, swelling, pain, itching, or induration. These typically subside by rotating injection sites (e.g., switching from the abdomen to the thigh).
Water and Sodium Retention
Manifesting as lower limb edema, potentially accompanied by elevated blood pressure. Blood pressure monitoring is essential; adjust dosage or combine with diuretics as needed.
Blood glucose fluctuations
Reduced insulin sensitivity leading to elevated blood sugar, potentially causing headaches. Diabetic patients require strict blood glucose monitoring and adjustment of hypoglycemic medication dosages.
Hormonal abnormalities
Elevated prolactin: May cause gynecomastia (especially when combined with steroids).
Elevated cortisol: Observed only at extremely high doses, potentially triggering anxiety, insomnia, or metabolic disorders.
Neurovascular Symptoms
Numbness, tingling, or carpal tunnel syndrome in hands/feet, typically alleviated by reducing dosage.
Increased Appetite
Though weaker than GHRP-6, some users experience heightened hunger and require dietary control to prevent weight gain.
Allergic Reactions
Rare but severe, including rash, breathing difficulties, or anaphylactic shock. Immediately discontinue use and seek medical attention.
Frequently Asked Questions
Where to inject GHRP-2?
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The right administration point selection makes a difference: A good choice of area leads to HGH being absorbed better with less pain. Common spots under the skin include the stomach, thighs, arms, or butt area. Muscle sites include the shoulder, thigh, or hips.
Does GHRP-2 make you hungry?
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These are the first data to demonstrate that peripheral administration of GHRP-2 increases food intake in humans. The effect of GHRP-2 is robust and elicited an increase of food intake in all subjects tested. Subjects reported being hungrier while receiving GHRP-2.
How long does GHRP-2 stay in your system?
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GHRP-2, GHRP-2 free acid and GHRP-2 (1-3) free acid were detected in urine up to 47 h after administration. GHRP-6 was mostly excreted unchanged and detected in urine 23 h after administration, its metabolites were detectable for 12 h only.
What is the difference between Ghrp 6 and GHRP-2?
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These results indicated that GHRP-2 acts on ovine pituitary somatotrophs to increase cAMP concentration in a manner similar to that of GRF; this occurs even during the blockade of Ca2+ influx. GHRP-6 caused GH release without an increase in intracellular cAMP levels.
What is the half-life of GHRP-2?
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In each man, three types of pulsatile-peptide infusions were performed during continuous intravenous saline (30 ml/h) and again during continuous intravenous GHRP-2 (1 μg·kg−1·h−1) infusion. GHRP-2 has a long elimination half-life of 26–39 min (27).
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