Sermorelin Dosage Guide: Protocol, Timing, Benefits & Safety

Michael Phelps
Peptide Science Researcher & Health Journalist at PrymaLab. Focused on evidence-based peptide therapy, longevity science, and translational endocrinology.

What Is Sermorelin? The Science Behind This GHRH Analog

Sermorelin acetate is a synthetic peptide that replicates the natural activity of growth hormone-releasing hormone, the signaling molecule your hypothalamus uses to tell the pituitary gland when to produce growth hormone. Unlike recombinant human growth hormone or synthetic HGH, which floods the body with exogenous hormone, sermorelin works upstream of the pituitary, stimulating it to manufacture and secrete growth hormone through your body's own natural machinery. This distinction is essential to grasp why sermorelin dosage protocols differ so greatly from direct growth hormone replacement therapy.

Structurally, sermorelin consists of the first 29 amino acids of the naturally occurring 44-amino acid GHRH molecule. Research conducted by Prakash and Goa in 1999 established that this 29-amino acid fragment represents the shortest fully functional sequence of GHRH, meaning it retains complete biological activity at the GHRH receptor despite being roughly two-thirds shorter than the parent molecule. Its chemical formula is C₁₄₉H₂₄₆N₄₄O₄₂S, and it carries a molecular weight of 3,357.93 g/mol. In scientific literature, you will often encounter sermorelin referred to as GRF 1-29 or GHRH(1-29)NH2, which simply describes its position as the first 29 residues of the growth hormone-releasing hormone sequence.

The United States Food and Drug Administration approved sermorelin in 1997 under the brand name Geref for treating children with growth hormone deficiency and growth failure. The manufacturer, EMD Serono, later discontinued commercial production in 2008, but the FDA issued a formal finding in March 2013 confirming that the withdrawal was not related to safety or effectiveness concerns. Today, sermorelin acetate remains available through compounding pharmacies as compounded medications for off-label prescriptions, and it has become one of the most widely studied growth hormone secretagogues in age-management and sports medicine research.

How Does Sermorelin Work? Mechanism of Action Explained

Understanding how sermorelin works at the cellular level is essential for appreciating why the correct sermorelin dosage matters. When you inject sermorelin subcutaneously, the peptide travels through the bloodstream to the anterior pituitary gland, where it binds to growth hormone-releasing hormone receptors expressed on the surface of somatotropic cells. This receptor, known as GHRHR, belongs to the class B family of G-protein-coupled receptors. A 2020 study published in Nature Communications by Zhou and colleagues provided the first structural analysis of GHRHR activation, revealing the precise molecular contacts that allow GHRH analogs like sermorelin to trigger intracellular signaling cascades.

Once sermorelin engages the GHRHR, the receptor initiates a G-protein signaling pathway that increases intracellular cyclic AMP levels within the somatotroph. This cyclic AMP rise has two key downstream effects. First, it triggers the immediate release of stored growth hormone granules into the bloodstream in a pulsatile fashion. Second, and equally important, it stimulates GH gene transcription at the mRNA level, which means sermorelin does not merely deplete existing growth hormone stores but actually increases the pituitary's capacity to produce new growth hormone over time. Walker and colleagues showed in 1994 that this transcriptional effect helps preserve the GH neuroendocrine axis, which is the first hormonal system to deteriorate during aging.

The growth hormone released by the pituitary then circulates throughout the body, acting on tissues directly and stimulating the liver to produce insulin-like growth factor 1, commonly known as IGF-1. The GH-IGF-1 axis is responsible for the downstream benefits associated with sermorelin therapy, including muscle protein synthesis, lipolysis, bone remodeling, collagen production, and cellular repair. Critically, the entire process remains governed by somatostatin, the inhibitory neurohormone that provides negative feedback to prevent growth hormone levels from rising to dangerous levels. This natural safety mechanism is one of sermorelin's most significant advantages over direct growth hormone use.

Sermorelin vs. HGH: Why Sermorelin Is a Safer Alternative

The distinction between sermorelin and recombinant human growth hormone is not merely academic; it has profound implications for safety, efficacy, and legality. Walker's 2006 editorial in Clinical Interventions in Aging identified several key shortcomings of rhGH for growth hormone therapy and replacement therapy in aging adults. When you inject rhGH, the exogenous hormone enters the bloodstream as a single bolus, creating what endocrinologists call a "square wave" pattern of exposure. Because the hormone bypasses the pituitary entirely, the body's normal feedback mechanisms cannot regulate tissue exposure. This pharmacological profile can lead to tachyphylaxis, a phenomenon where repeated exposure diminishes the body's response, and it forces practitioners to estimate dosages based mainly on IGF-1 blood tests and subjective patient reports rather than the body's own regulatory intelligence.

Sermorelin addresses each of these limitations by working through the body's endogenous growth hormone production system. Because somatostatin provides negative feedback on the pituitary, sermorelin-induced growth hormone release is inherently self-limiting. The growth hormone secreted after a sermorelin injection is episodic and intermittent, mirroring the natural pulsatile rhythm that healthy young adults experience. This natural pattern avoids the sustained supraphysiological peaks that raise concerns about insulin resistance, fluid retention, and possible cancer risk with long-term rhGH use. Additionally, sermorelin stimulates pituitary GH gene transcription, which means it actually strengthens pituitary function over time rather than allowing it to atrophy from disuse, as can occur with exogenous growth hormone administration.

Benefits of Sermorelin Therapy: What the Research Shows

The treatment benefits of sermorelin derive from its ability to restore more youthful patterns of growth hormone secretion, which in turn activates the GH-IGF-1 axis across multiple organ systems. Decades of clinical research have documented improvements in body composition, physical performance, sleep architecture, cognitive function, and markers of metabolic health. What separates sermorelin from anecdotal wellness claims is the depth of controlled clinical evidence supporting these outcomes.

Body Composition and Muscle Mass

Growth hormone regulates skeletal muscle growth both directly and through IGF-1-mediated pathways. A randomized controlled trial by Khorram and colleagues published in the Journal of Clinical Endocrinology and Metabolism in 1997 showed that long-term sermorelin administration to age-advanced men and women significantly increased skin thickness and lean body mass. Vittone et al. reported in a 1997 study that single nightly sermorelin injections in healthy elderly men improved aerobic capacity in forearm muscle and enhanced measures of muscular strength, suggesting that even modest sermorelin dosage protocols can produce measurable functional gains.

Fat Loss and Metabolic Enhancement

Growth hormone is a potent stimulator of lipolysis, the biochemical process by which stored triglycerides in adipose tissue are broken down into free fatty acids and glycerol for energy use. The Baker et al. 2012 study, which enrolled 152 adults aged 55 to 87 in a 20-week GHRH treatment protocol, documented a 7.4 percent reduction in body fat alongside a 117 percent increase in IGF-1 levels. These findings align with the broader body of evidence showing that GHRH analogs reduce visceral adiposity, decrease triglycerides, and improve cardiovascular risk markers, as reviewed by Stanley and Grinspoon in 2015.

Sleep Quality and Recovery

The relationship between growth hormone and sleep is bidirectional. Growth hormone secretion peaks during slow-wave sleep, and adequate growth hormone levels appear to support deeper, more restorative sleep cycles. Research by Guldner et al. showed that pulsed GHRH administration to healthy older adults reduced nighttime awakenings and extended the first period of non-rapid eye movement sleep. Perras and colleagues further showed that intranasal GHRH lowered cortisol levels at sleep onset, suggesting that sermorelin may improve sleep through both hormonal and neural mechanisms. These sleep improvements contribute directly to enhanced physical recovery and athletic performance.

Cognitive Function

The GH-IGF-1 axis plays a critical role in brain structure, function, and neuroplasticity. Vitiello and colleagues reported in 2006 that GHRH treatment improved cognition in healthy older adults regardless of gender or baseline cognitive status. The larger Baker 2012 trial confirmed these findings, showing that GHRH produced significant cognitive gains in both patients with mild cognitive impairment and cognitively healthy older adults, with the most pronounced benefits observed in executive function domains such as planning, working memory, and cognitive flexibility.

What Is the Standard Sermorelin Dosage?

Finding the correct sermorelin dosing protocol depends on the individual's treatment goals, body weight, age, and baseline growth hormone status. However, several dosing ranges have been established through clinical research and prescribing practice. The standard sermorelin dosage for general health optimization and anti-aging in adults is 200 to 300 micrograms, equivalent to 0.2 to 0.3 milligrams, given as a single subcutaneous injection about 30 minutes before bedtime. This timing is deliberately chosen to coincide with the body's natural nocturnal growth hormone pulse, which occurs primarily during the first few hours of deep sleep. The sermorelin starting dose for most adults is typically 200 mcg, which a healthcare professional can then titrate upward to 300 mcg based on IGF-1 blood levels and clinical response.

For the original FDA-approved pediatric indication, sermorelin dosage was calculated at approximately 30 micrograms per kilogram of body weight, given once daily subcutaneously. Adult dosing in clinical research settings has varied more widely. The landmark Corpas et al. 1992 NIH study used 0.5 to 1.0 milligrams twice daily in elderly men, which represents the higher end of research protocols. In clinical practice, most prescribers begin at the lower end of the dosing range and titrate upward based on IGF-1 blood levels, symptom response, and side effect tolerance. It is critically important to note that sermorelin dosage should always be determined by a qualified healthcare professional who can monitor hormonal markers and adjust protocols accordingly.

Sermorelin Dosage for Muscle Growth and Bodybuilding

Athletes and bodybuilders seeking sermorelin dosage for muscle growth often require higher daily amounts than the standard anti-aging protocol. The sermorelin dosage bodybuilding protocol often ranges from 500 to 1,000 micrograms, or 0.5 to 1.0 milligrams, given subcutaneously before bedtime. The sermorelin dosage for bodybuilding is structured in tiers, with beginners starting at 300 mcg to assess tolerance before moving to higher amounts. This elevated dosage aims to maximize growth hormone output, thereby enhancing muscle protein synthesis, accelerating recovery between training sessions, and supporting the connective tissue remodeling that is essential for adapting to progressive resistance training. A healthcare professional should always oversee any dosage for bodybuilding to ensure safety and proper monitoring.

The rationale for higher dosing in bodybuilding contexts is supported by the Corpas 1992 NIH study, which showed that only the high-dose protocol of 1 milligram twice daily produced statistically significant increases in mean 24-hour growth hormone level and IGF-1 levels sufficient to eliminate age-related differences between young and elderly men. However, it is essential to approach these doses with medical oversight from a healthcare professional, as individual responses vary considerably based on pituitary reserve, body composition, training status, and concurrent medications like glucocorticoids or other peptides.

Recommended Bodybuilding Cycles

Sermorelin Dosage for Weight Loss

Sermorelin for weight loss leverages growth hormone's powerful lipolytic effects. When growth hormone levels increase, the hormone directly stimulates adipose tissue to release stored fatty acids through a process called lipolysis. These liberated fatty acids are then channeled into the mitochondria for beta-oxidation, effectively shifting the body's metabolic preference away from carbohydrate storage and toward fat burning. The 2012 Baker study provides the strongest clinical evidence for this use, showing a 7.4 percent reduction in total body fat over 20 weeks of GHRH treatment in adults aged 55 to 87.

The recommended sermorelin dosage for weight loss falls within the standard anti-aging range of 200 to 300 micrograms daily, though some practitioners prescribe up to 500 micrograms for patients with significant adiposity. A sermorelin dosage calculator for weight loss can help estimate the ideal starting dose by factoring in body weight, body fat percentage, and metabolic goals. However, any sermorelin dosage for weight loss should be confirmed with a healthcare professional before beginning therapy. The key to sermorelin's weight loss effects is consistency over time rather than aggressive dosing. Most patients begin to notice visible fat reduction between months two and three of treatment, with continued improvement through months four to six. Combining sermorelin therapy with regular exercise, especially resistance training, and a protein-adequate diet amplifies the body composition benefits by simultaneously building lean mass and reducing fat mass.

The mechanism by which sermorelin for weight loss operates is particularly interesting from a metabolic standpoint. Growth hormone does not simply reduce caloric intake or suppress appetite. Instead, it fundamentally alters substrate utilization, directing the body to preferentially oxidize fatty acids rather than storing them. This metabolic shift means that patients using sermorelin for weight loss often notice changes in body composition even before the scale shows significant weight reduction, because they are simultaneously losing fat mass while preserving or gaining lean muscle tissue. Stanley and Grinspoon highlighted in their 2015 review that GHRH treatment reduced visceral adiposity, decreased triglycerides, and lowered cardiovascular risk markers, making sermorelin for weight loss a potentially valuable component of comprehensive metabolic health programs.

Sermorelin Dosage for Anti-Aging and Longevity

The anti-aging application of sermorelin is grounded in the well-documented decline of growth hormone secretion during the aging process. Research by Hersch and Merriam published in Clinical Interventions in Aging in 2008 reviewed the extensive evidence showing that daily GH secretion decreases from about 150 micrograms per kilogram per day during puberty to only about 25 micrograms per kilogram per day by age 55. Russell-Aulet and colleagues identified the specific mechanism in 2001, showing that age-related growth hormone decline is caused by a selective reduction in hypothalamic GHRH pulse amplitude rather than pituitary failure. This finding is particularly encouraging for sermorelin therapy because it means the aging pituitary retains the capacity to respond to GHRH stimulation if provided with adequate signaling input.

For anti-aging, healthy aging, and longevity purposes, the standard sermorelin dosage of 200 to 300 micrograms once daily before bedtime is widely recommended. The sermorelin starting dose for anti-aging is typically 200 mcg, which a healthcare professional can adjust upward to 300 mcg based on follow-up lab work. This dosage has been shown in multiple clinical studies to restore more youthful patterns of growth hormone and IGF-1 secretion. Villalobos et al. showed in 1997 that sustained GHRH stimulation promotes pituitary recrudescence, essentially rejuvenating pituitary function and slowing the cascade of hormone decline that accompanies aging. Walker emphasized in 2006 that this preservation of the GH neuroendocrine axis represents sermorelin's most important advantage for long-term anti-aging therapy, as it addresses the root cause of hormone decline rather than simply replacing the downstream hormone.

The anti-aging benefits of sermorelin extend beyond simple growth hormone restoration. Because sermorelin stimulates GH gene transcription at the pituitary level, chronic treatment may help maintain the structural integrity and functional capacity of somatotroph cells that would otherwise atrophy during the aging process. This pituitary preservation effect creates a virtuous cycle: healthier somatotrophs produce more growth hormone in response to each GHRH pulse, which in turn supports downstream tissue maintenance through the GH-IGF-1 axis. Patients using sermorelin for anti-aging often commit to treatment cycles of three to six months, followed by reassessment of IGF-1 levels and clinical symptoms before deciding on continuation or cycling protocols. Many anti-aging practitioners recommend periodic sermorelin cycles rather than continuous indefinite use, though the optimal long-term protocol has not been established through rigorous controlled trials.

Sermorelin Dosage Chart: Complete Protocol Reference

The following sermorelin dosage chart provides a comprehensive reference for the most common clinical protocols. All dosages should be confirmed with a prescribing healthcare professional, as individual needs vary based on age, body weight, baseline hormonal status, and treatment objectives.

Administration Guidelines

Sermorelin is given via subcutaneous injection using an insulin syringe. Reconstitution requires sterile bacteriostatic water, and the reconstituted solution must be refrigerated and stored at 2 to 8 degrees Celsius in a refrigerator. Do not freeze. Injection sites should be rotated among the abdomen, lateral thigh, deltoid, and hip to prevent injection-site reactions and lipodystrophy. Each injection should be administered at a different anatomical location than the previous day. Most practitioners recommend administering the injection on an empty stomach by fasting for at least 90 minutes before the bedtime injection, as elevated blood sugar and insulin can blunt the growth hormone response to sermorelin.

What Does Sermorelin Before and After Look Like?

Understanding the sermorelin before and after timeline helps set realistic expectations for therapy outcomes. Sermorelin does not produce overnight transformations. Instead, the peptide gradually restores growth hormone secretion patterns over weeks and months, with benefits accumulating progressively as the GH-IGF-1 axis is reactivated. The timeline below is based on clinical research data and aggregated practitioner findings across thousands of patients.

Sermorelin Before and After Timeline

It is important to recognize that individual sermorelin before and after results vary considerably based on baseline hormone levels, age, diet, exercise habits, sleep quality, and overall health status. Patients with more significant growth hormone deficiency at baseline tend to experience more dramatic improvements. Blood work monitoring of IGF-1 levels at baseline, 6 weeks, and 12 weeks provides objective confirmation that the chosen sermorelin dosage is producing the desired physiological response.

What Are the Side Effects of Sermorelin?

Sermorelin has a well-established safety profile supported by decades of clinical use and research. The Mayo Clinic drug monograph, based on Micromedex data, categorizes sermorelin side effects by frequency. The most commonly reported adverse effect is localized pain, redness, or swelling at the injection site, which typically resolves within 15 to 30 minutes and tends to diminish with continued use as patients refine their injection technique and rotation pattern.

Less frequent side effects, classified as rare in the clinical literature, include headache, dizziness, facial flushing, transient sleepiness, and difficulty sitting still. These effects are generally mild, self-limiting, and do not typically require treatment discontinuation. The favorable side effect profile of sermorelin is directly attributable to its mechanism of action: because the pituitary's growth hormone release remains governed by somatostatin negative feedback, the body can self-regulate hormone output even if the administered sermorelin dosage is on the higher end of protocols. If any side effects persist or worsen, consult a healthcare professional promptly.

Sermorelin Long-Term Side Effects and Safety Profile

Concerns about sermorelin long-term side effects are understandable given that the peptide modulates a powerful hormonal axis. However, the available evidence is reassuring. The Corpas 1992 NIH study, which used doses of up to 1 milligram twice daily, reported no adverse changes in fasting glucose, urinary C-peptide, blood pressure, or comprehensive chemistry and hematology panels. The FDA's 2013 Federal Register finding explicitly confirmed that Geref was not withdrawn from the market due to safety or effectiveness concerns, further supporting sermorelin's long-term safety record.

The theoretical concern with any growth hormone-stimulating therapy is the potential to promote proliferation of pre-existing malignancies, since GH and IGF-1 have mitogenic properties. However, this risk is substantially lower with sermorelin compared to direct rhGH use—or the use of glucocorticoids—because the somatostatin feedback loop prevents sustained supraphysiological hormone levels. Walker noted in 2006 that all cancer-related concerns with GHRT were speculative and would require large-scale, long-term studies to confirm or refute. As a precaution, sermorelin is generally contraindicated in patients with active malignancies. Other long-term considerations include the potential interaction with thyroid function, as hypothyroidism can blunt the pituitary's response to GHRH stimulation, and patients should have thyroid status assessed by a healthcare professional before starting therapy.

Sermorelin Tablets vs. Injections: Delivery Methods Compared

The question of sermorelin tablets versus injections reflects growing demand for needle-free peptide delivery. Traditional subcutaneous injection remains the gold standard for sermorelin administration because it provides reliable absorption and rapid bioavailability directly into the bloodstream. Peptides like sermorelin are inherently vulnerable to enzymatic degradation in the gastrointestinal tract, which has historically limited oral delivery options.

However, advances in pharmaceutical technology have created new possibilities. Liposomal delivery systems encapsulate the sermorelin peptide within lipid vesicles that protect it from digestive enzymes and facilitate absorption through the intestinal mucosa. Some compounding pharmacies now offer sublingual sermorelin tablets or troches that dissolve under the tongue for partial absorption through the oral mucosa, bypassing first-pass hepatic metabolism. Nasal spray formulations have also been studied, with Wilton et al. showing in 1993 that intranasal GHRH stimulates growth hormone secretion, although with lower bioavailability than injection.

Tesamorelin vs. Sermorelin: How Do They Compare?

Both tesamorelin and sermorelin are GHRH analogs that target the same receptor on pituitary somatotrophs, but they differ in structure, pharmacokinetics, FDA approval status, and primary clinical applications. Tesamorelin is a modified version of the full 44-amino acid GHRH molecule with a trans-3-hexenoic acid modification that enhances its stability and extends its half-life to approximately 30 minutes, compared to sermorelin's 10 to 20 minutes. Falutz and colleagues published a landmark trial in the New England Journal of Medicine in 2007 showing that tesamorelin significantly reduced visceral adipose tissue in HIV patients with abdominal fat accumulation, leading to its FDA approval under the brand name Egrifta for HIV-associated lipodystrophy.

In the context of anti-aging and bodybuilding, the choice between tesamorelin vs sermorelin often depends on availability, cost, and treatment objectives. Sermorelin is more widely accessible through compounding pharmacies and generally less expensive because it is a shorter peptide. Tesamorelin may offer advantages for patients primarily targeting visceral fat reduction due to its stronger evidence base in this area. Both peptides preserve somatostatin feedback and stimulate natural GH secretion, so their safety profiles are comparable. When evaluating tesamorelin vs sermorelin for general growth hormone optimization, many practitioners favor sermorelin because of its longer track record, broader availability, and lower cost, reserving tesamorelin for cases where visceral adiposity is the primary treatment target. Some clinicians use both peptides sequentially, starting with sermorelin for initial GH axis restoration and transitioning to tesamorelin if visceral fat reduction remains insufficient after three to six months of sermorelin therapy.

Ipamorelin vs. Sermorelin: Which Is Better?

The comparison between ipamorelin and sermorelin is highly relevant because these peptides stimulate growth hormone through entirely different receptor systems, making them complementary rather than redundant. Sermorelin acts on the GHRH receptor, directly mimicking the hypothalamic signal that tells the pituitary to release growth hormone. Ipamorelin, by contrast, is a pentapeptide growth hormone secretagogue that activates the ghrelin receptor, also known as GHS-R1a. Svensson and colleagues published the definitive study of ipamorelin in the Journal of Clinical Endocrinology and Metabolism in 2000, noting that it stimulates growth hormone release with remarkable selectivity, avoiding the cortisol and prolactin elevations seen with earlier ghrelin mimetics like GHRP-6.

The practical differences between ipamorelin vs sermorelin include half-life, receptor target, and stacking potential. Ipamorelin has a substantially longer half-life of approximately two hours compared to sermorelin's 10 to 20 minutes, meaning it provides a more sustained growth hormone release signal. Many practitioners prescribe both peptides together in what is sometimes called a growth hormone peptide stack, reasoning that simultaneous activation of both the GHRH receptor and the ghrelin receptor produces a combined growth hormone response greater than either peptide alone. While this combination approach is increasingly common in clinical practice, definitive controlled trials comparing the combination to monotherapy remain limited.

Is Sermorelin FDA-Approved? Legal Status Explained

The regulatory history of sermorelin is often misunderstood, and clarity on this topic is essential for both practitioners and patients. Sermorelin acetate received FDA approval in 1997 under New Drug Application 020443 for the treatment of idiopathic growth hormone deficiency in children. It was marketed by EMD Serono under the brand names Geref and Geref Diagnostic. In 2008, the manufacturer made a business decision to discontinue production, choosing to focus on other products in its portfolio. This discontinuation was not precipitated by any safety signal, adverse event report, or regulatory enforcement action.

On March 4, 2013, the FDA published a formal finding in the Federal Register (Docket No. FDA-2012-P-1071) confirming that Geref sermorelin acetate injection was not withdrawn from sale for reasons of safety or effectiveness. This finding is significant because it allows compounding pharmacies to legally produce sermorelin for individual patient prescriptions under the provisions of Section 503A and 503B of the Federal Food, Drug, and Cosmetic Act. Unlike recombinant human growth hormone or synthetic HGH, which is restricted by the Code of Federal Regulations to treatment of AIDS wasting or diagnosed growth hormone deficiency, sermorelin can be prescribed off-label by licensed physicians without federal legal restrictions.

Buying Sermorelin Safely: Quality and Sourcing Guide

Purchasing sermorelin requires a prescription from a licensed healthcare professional, and the peptide should be obtained exclusively from licensed compounding pharmacies that adhere to United States Pharmacopeia standards. Because sermorelin is no longer commercially manufactured as a branded product, all currently available sermorelin is compounded, which means quality can vary significantly between sources. Patients should verify that their compounding pharmacy holds current state licensure, is registered with the FDA as a 503A or 503B facility, and provides certificates of analysis documenting peptide purity and potency.

Third-party testing through independent laboratories is an additional quality marker that distinguishes reputable suppliers. Certificates of analysis should confirm peptide identity through methods such as high-performance liquid chromatography and mass spectrometry, with purity levels of 98 percent or higher. Patients should also verify that the pharmacy uses proper lyophilization techniques to create a stable lyophilized powder and provides clear reconstitution instructions with bacteriostatic water. Avoid purchasing sermorelin from overseas suppliers, online marketplaces, or sources that do not require a prescription, as these products may contain impurities, an incorrect concentration, or no active peptide at all.

Key Takeaways

References and Clinical Sources

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11. Ipamorelin, a new growth-hormone-releasing peptide, induces longitudinal bone growth in rats" P B Johansen. PMID: 10373343 DOI: 10.1054/ghir.1999.9998
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