Hexarelin Capsules exert their effects by mimicking the action of ghrelin, precisely triggering the pulsatile release of growth hormone from the pituitary gland. Unlike direct exogenous hormone supplementation, it is less likely to cause endogenous suppression, and does not readily induce rapid desensitization after repeated administration, offering a longer duration of action than most GHRP peptides. The oral formulation avoids the inconvenience of injection, and its bioavailability is optimized through formulation design, making it suitable for daily rhythmic use.
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Hexarelin COA
I. Molecular Basis of Hexarelin in Immune Function Regulation
The immunomodulatory effect of .Hexarelin Capsules is not achieved through direct action on immune cells, but via dual pathways: endocrine axis regulation and direct receptor-mediated signaling.
On one hand, Hexarelin significantly promotes the physiological pulsatile secretion of endogenous growth hormone (GH) and insulin-like growth factor-1 (IGF-1). The GH/IGF-1 axis is a critical hub connecting the endocrine and immune systems, regulating multiple processes including thymic development, lymphocyte proliferation and differentiation, and cytokine secretion.Unlike exogenous GH supplementation, Hexarelin achieves physiological release through receptor agonism, avoiding drastic fluctuations in hormone levels, resulting in milder immune regulation closer to the physiological rhythm.
On the other hand, Hexarelin can directly bind to the growth hormone secretagogue receptor GHSR‑1a expressed on the surface of immune cells. Studies have confirmed that GHSR‑1a is expressed on monocytes, macrophages, T lymphocytes, and other immune cells, providing a structural basis for Hexarelin to directly regulate immune cell function.By activating downstream signaling pathways, Hexarelin directly modulates inflammatory factor release, oxidative stress levels, and apoptosis, enabling precise regulation of immune responses.
II. Regulatory Effects on Immune Organs and Immune Cells
(1) Protecting Thymic Structure and Function, Delaying Immune Senescence
The thymus is the core organ for T‑cell maturation and a key marker of immune senescence. With aging, stress injury, or disease, the thymus undergoes atrophy and fatty infiltration, leading to reduced naive T‑cell output and weakened host defense and immune surveillance.The product mitigate thymic atrophy, maintain thymic epithelial cell function, promote T‑cell proliferation and positive selection, and enhance adaptive immune reserve through the GH/IGF‑1 axis and direct receptor interactions.For the elderly, individuals under chronic stress, and postoperative patients, its thymoprotective effect helps delay immune senescence and strengthen overall immune resilience.
(2) Regulating Lymphocyte Quantity and Function
Hexarelin increases peripheral blood lymphocyte count, promotes the proliferation and activation of CD4+ and CD8+ T cells, and enhances specific immune responses.It also moderately stimulates B‑cell proliferation and antibody secretion, helping to improve humoral immunity and enhance the body's ability to clear pathogens.Unlike immune stimulants, Hexarelin does not non‑specifically activate immunity; it promotes recovery under immunocompromised conditions and buffers excessive immune activation, exhibiting dual‑directional immune homeostasis regulation.
(3) Modulating Macrophages and Innate Immune Responses
Macrophages are the core effector cells of innate immunity, with functions including phagocytosis, antigen presentation, and inflammatory mediator secretion.Hexarelin Capsules inhibits excessive macrophage activation via GHSR‑1a, reducing the excessive release of pro‑inflammatory factors such as TNF‑α, IL‑6, and IL‑1β, while enhancing macrophage phagocytic efficiency to promote the removal of damaged cells and pathogens.This profile of "anti‑inflammation + enhanced phagocytosis" gives it important value in inflammatory injury caused by overactivated innate immunity.
III. Applications in Inflammatory and Stress‑Related Immune Regulation
Inhibiting Excessive Inflammation and Maintaining Immune Balance
Excessive inflammation is a common pathological basis of infection, trauma, metabolic disorders, and autoimmune abnormalities.The product reduce pro‑inflammatory cytokine storms and alleviate tissue inflammatory infiltration and injury by inhibiting inflammatory signaling pathways such as NF‑κB.Its mechanism is biased toward immune calibration rather than simple immunosuppression; thus, it suppresses pathological inflammation without significantly impairing host defense, distinguishing it from traditional immunosuppressants.
Improving Immune Suppression Under Stress Conditions
Long‑term mental stress, high‑intensity exercise, surgical trauma, radiotherapy, and chemotherapy can induce stress‑related immune suppression, characterized by lymphopenia, reduced phagocytic function, and elevated infection risk.Hexarelin alleviates excessive stress responses by regulating the hypothalamic‑pituitary‑adrenal axis, reduces the immunosuppressive effect of excessive cortisol secretion, and directly enhances immune cell viability, maintaining stable immune function under stress.
IV. Preclinical and Potential Application Scenarios
In preclinical studies, Hexarelin has shown stable immunomodulatory effects in models of age‑related immune decline, chronic low‑grade inflammation, post‑traumatic immune disorders, and post‑radiochemotherapy immune injury.It improves immune cell ratios, reduces chronic inflammatory markers, and enhances anti‑infective capacity and tissue repair.
The oral advantage of Hexarelin Capsules makes it suitable for long‑term, regular use as an adjuvant intervention for individuals with immunodeficiency, immune senescence, and chronic inflammation.Compared with exogenous cytokines, immunoglobulins, and other interventions, Hexarelin mainly acts through endogenous regulation, with higher safety, better tolerability, and a lower risk of immune imbalance.
V. Safety and Application Characteristics
Hexarelin demonstrates favorable safety within the recommended dosage range. It does not directly damage immune organs or cause excessive immune activation or severe immunosuppression.Its action is mild and centered on homeostatic regulation, making it suitable for long‑term immune function maintenance.Since it does not directly supplement antibodies or exogenous immune cells, its effects are characterized by progressive improvement, focusing on the repair and remodeling of the internal immune environment.
I. Identification Method of the Active Ingredient
The identification test is used to confirm the presence of Hexarelin in the preparation and eliminate interference from impurities. Two complementary methods are commonly used to ensure accuracy.
The first is Ultraviolet Spectrophotometry. An appropriate amount of the capsule contents is taken and dissolved in anhydrous ethanol to prepare a solution containing 0.3 mg per mL. The solution is measured by spectrophotometry, showing a maximum absorption at 248 nm, consistent with the absorption spectrum of the reference solution, allowing rapid preliminary identification of the active ingredient.
The second is High Performance Liquid Chromatography (HPLC). In the chromatogram recorded under the assay procedure, the retention time of the test solution peak is consistent with that of the Hexarelin reference standard, further confirming the purity of the active ingredient and avoiding interference from structurally similar impurities.
II. Assay Method (High Performance Liquid Chromatography)
High Performance Liquid Chromatography (HPLC) is the core method for the assay of Hexarelin Capsules. It has the advantages of strong specificity, high sensitivity and good reproducibility, meeting the requirements for pharmaceutical quality control.
Chromatographic conditions:Octadecylsilane-bonded silica gel is used as the filler; the mobile phase consists of an acetonitrile‑water system (the ratio can be adjusted according to separation performance); the detection wavelength is set at 248 nm, matching the maximum absorption wavelength of the active ingredient.
System suitability requirements:The theoretical plate number calculated by the Hexarelin peak is not less than 1500; the tailing factor is controlled within 0.95–1.05; the resolution is greater than 1.5.
Procedure:An accurately weighed quantity of the capsule contents is dissolved in the mobile phase and quantitatively diluted to prepare a solution containing 0.2 mg per mL. Exactly 20 μL is injected into the HPLC system and the chromatogram is recorded. Separately, Hexarelin reference standard, previously dried at 70 °C for 2 hours, is assayed in the same manner. The content is calculated from the peak areas by the external standard method to ensure accurate results with errors within acceptable limits.
III. Related Substances Test Method
Related substances mainly include synthetic intermediates, degradation products and trace impurities of Hexarelin. The HPLC method is employed to ensure the safety of the preparation.
Chromatographic conditions are generally consistent with those used in the assay, with appropriate adjustments to the mobile phase ratio to improve impurity separation. The principal component self-dilution control method is used: an appropriate volume of the test solution is quantitatively diluted with the mobile phase to prepare a control solution. Both solutions are injected into the chromatograph and the chromatograms are recorded.
Limits:The area of any individual impurity peak in the test solution is not greater than 0.5% of the area of the principal peak in the control solution; the total impurity peak area is not greater than 1.0% of the principal peak area in the control solution, thereby effectively controlling impurity levels.
Thin-layer chromatography (TLC) can be used as a supplementary test, complementing HPLC to comprehensively detect impurities and ensure the preparation meets purity standards.
I. Chemical Stability
Chemical stability refers to the stability of the chemical structure of Hexarelin, the active ingredient in it, with the core objective of preventing degradation, oxidation, or conversion of the active ingredient into impurities. As a hexapeptide compound, Hexarelin is prone to hydrolysis of its peptide bonds under acidic/alkaline conditions and high temperatures, leading to a decrease in active ingredient content and the formation of degradation impurities, which impair the purity of the preparation.
Its chemical stability is optimal under neutral conditions, whereas acidic or alkaline environments accelerate peptide bond cleavage. In addition, Hexarelin is sensitive to oxidation and readily undergoes oxidation upon exposure to oxygen, forming oxidative impurities. Therefore, appropriate antioxidants are added during manufacturing to inhibit oxidative degradation and ensure the stability of the active ingredient.
II. Physical Stability
Physical stability mainly concerns the physical state of the capsule dosage form and its contents, ensuring no significant changes in appearance and compliance with disintegration time requirements.
The contents of this product are white or off-white powder with good physical stability; under appropriate conditions, no moisture absorption, caking, discoloration, or other abnormalities occur. The capsule shell is made of pharmaceutical-grade gelatin, which must be protected from high temperature and high humidity to prevent softening, deformation, rupture, and subsequent leakage or moisture-induced deterioration of the contents.
Meanwhile, the disintegration time must remain stable. Abnormal physical conditions can lead to delayed disintegration, affecting gastrointestinal absorption of the active ingredient and reducing therapeutic efficacy.
III. Storage and Environmental Stability
Storage conditions are critical factors affecting the stability of it, with temperature, humidity, and light as the three key controlled parameters.
The recommended storage conditions are sealed, light-protected, in a cool and dry place, at a temperature of 10–30 °C and relative humidity ≤ 60%. High temperatures (above 30 °C) accelerate degradation of the active ingredient; high humidity causes moisture absorption and caking of the capsule contents; and strong light induces photodegradation of the active ingredient, all of which shorten the shelf life.
Under the specified storage conditions, the shelf life of this product is 24 months. After opening, the capsules should be kept tightly sealed and used as soon as possible to avoid reduced stability due to moisture absorption or contamination. During transportation, violent shaking and high-temperature exposure should be avoided to ensure the stability of the preparation.
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