Where to Buy MK 677: Vendor Comparison & Research Info

MK-677, is a orally bio-active, selective agonist of the ghrelin receptor. Research shows that MK-677 increases the natural secretion of growth hormone (GH) and insulin-like growth factor 1 (IGF-1), but does not affect cortisol levels. It is being researched as a possible treatment for GH deficiency, muscle and bone wasting, appetite stimulation and Alzheimer's disease. MK-677 research in mice, appeared to prevent the onset of AD, even in genetically predisposed mice, as long as it was started before significant amyloid beta accumulation. MK-677 research has also shown exceptionally promising benefits in improving sleep quality.

MK-677 (Ibutamoren) Overview

MK-677, also known as Ibutamoren and Oratrope, is a potent, orally active, selective agonist of the ghrelin receptor. This makes it a growth hormone secretagogue and ghrelin mimetic. It is not a ghrelin analogue, however, as it is not a peptide and therefore shares no structural similarities to ghrelin. Research shows that MK-677 increases the secretion of growth hormone (GH) and insulin-like growth factor 1 (IGF-1), but does not affect cortisol levels.  This means that MK-677 activates the GH axis and therefore promotes an increase in lean body mass. It is under investigation as a treatment for growth hormone deficiency, muscle and bone wasting, and appetite stimulation. MK-677 is valued for its long half-life and excellent oral bioavailability. Research in humans shows that IGF-1 levels remain elevated for up to 24 hours after a single dose of MK-677.

MK-677 and SARMs

MK-677 is often grouped with the selective androgen receptor modulators (SARMs) because it doesn’t fit neatly into any other category. MK-677 is not a SARM, however. It also isn’t a peptide. It is best described as a complex, synthetic chemical propanamide derivative that acts as a ghrelin receptor agonist[1]. Though it is not a peptide, MK-677 best fits into the growth hormone secretagogue family of peptides if considering effects. Like GHRP-2, GHRP-6, hexarelin, and ipamorelin, MK-677 binds to the ghrelin/growth hormone secretagogue receptor and boosts GH release while maintaining normal physiologic, pulsatile patterns of GH fluctuation.

One of the benefits of MK-677 is actually the fact that it is not a SARM. SARMs tend to impact natural androgen production and thus can lower testosterone levels. This means that their administration must be carefully controlled and that the compounds should be cycled on and off to avoid suppression of natural androgen production. MK-677 does not require these precautions.

MK-677 Structure

Molecular Formula: C27H36N4O5S Molecular Weight: 528.7 g/mol PubChem CID: 9939050 CAS Number: 159634-47-6 Synonyms: MK-0677, Oratrope, Ibutamoren, L-163,191

MK-677 Research

MK-677 and Somatopause

It has been shown that without intervention, growth hormone secretion and muscle mass decline starting at mid-puberty. This ultimately leads to the frailty and loss of muscle function we see in the elderly.  The progressive decline of GH and IGF-1 with age is referred to as somatopause. On average, a male at 70 years of age will produce about 60% of the growth hormone he produced at age 18. This can lead to changes in body composition, loss of bone density, and more. Interestingly, estrogen and progesterone appear to increase GH and IGF-1 levels, thereby reducing the effects of somatopause in women as they age.

Compounds like MK-677 may offer a way of slowing or even halting the progression of somatopause. This could lead to improved muscle and bone strength in older age and may affect everything from cardiac function to brain health. Research is in its early stages, but a number of animal and human trials are showing early promise.

MK-677 and Body Composition

If somatopause is such a substantial contributor to the frailty of aging, then reversing, preventing, or slowing it could help to stave off age-related declines in bone density, muscle strength, and more. In a 2-year randomized controlled trial complete with placebo, blinding, and crossover, researchers demonstrated that once daily oral administration of MK-677 (just 25 mg) significantly increased growth hormone levels and IGF-1 levels without serious adverse effects. This resulted in an increase in body weight of approximately 2 kg compared to placebo, increased bone mineral density, no changes in strength, and no changes in fat mass. Subjects also experienced a decrease in LDL cholesterol (bad cholesterol) and modest increases in cortisol levels. Appetite increased initially, but reverted to normal after several months[2].

One potentially interesting application of MK-677 may be in the setting of diet induced negative nitrogen balance, which is a complicated clinical way of saying low-protein consumption. Low protein consumption can be the result of a number of things, but is most often seen in the healthcare setting as a result of disease or disability. It is particularly problematic for bed-ridden patients, such as those who have suffered trauma. The ability of MK-677 to counteract negative nitrogen balance is not just about nutrition, however[3]. Protecting protein stores in the body from depletion can lead to better clinical outcomes in everything from stroke to infection. It can even help to prolong lifespan and healthspan by protecting against the disability associated with sarcopenia (muscle loss).

Previous research has shown that simultaneously boosting GH and IGF-1 can improve nitrogen retention in the setting of parenteral nutrition[3]. This is precisely what MK-677 does with a single orally administered dose. This function alone may make MK-677 a staple of intensive care units in the near future.

Research in elderly patients has shown that daily ibutamoren can boost the GH/IGF-1 axis to levels similar to those found in healthy young adults. This occurs without serious adverse effects and results in a significant increase in lean body mass, decreases in LDL cholesterol, and no change in HDL cholesterol[5]. There is some interest then in using ibutamoren as a long-term supplement to ward off the muscle loss and body composition changes associated with aging.

Overall, MK-677 administration appears to have limited effects on body composition. Combined with exercise, however, it’s ability to increase GH and IGF-1 levels may help to improve muscle strength and density, reduce fat mass, and boost bone density. Bone density is discussed in detail in the next section.

MK-677 and Bone Density

Research in young, obese males shows that MK-677 significantly alters bone function by increasing both bone deposition and resorption[6].  Similar results are seen in elderly test subjects[7]. These findings are a classic indication of increased bone remodeling and can be either good or bad depending on the setting. Increased bone remodeling can lead to improved bone strength and resistance to fracture when paired with weight/resistance training, for instance.

In a multi-center study of elderly patients with hip fracture, research shows that MK-677 can improve gait speed and reduced numbers of falls[8]. These is thus reason to believe that the compound does, in fact, improve bone density and function, but more research is needed.

In one trial, 9 weeks of MK-677 resulted in a nearly 30% increase in serum ostocalcin and a 10% increase in bone-specific alkaline phosphatase. Both of these markers suggest increased bone deposition[5]. Individuals in these studies showed a trend toward more independent living following hip fracture. A great deal more research needs to be done, particularly as there is reason to believe that MK-677 may be synergistic with some of the growth hormone releasing hormone (GHRH) analogues and growth hormone releasing peptides (GHRPs) like sermorelin and tesamorelin.

MK-677 and Neurological Function

Research in animals has demonstrated that IGF-1 is an important component in the clearance of amyloid beta from the central nervous system. Amyloid beta plaques that result from a build-up of amyloid beta are a hallmark of Alzheimer’s disease (AD) and are indicative of disease severity. It is interesting that AD is a disease of the elderly because IGF-1 levels in the brain have been shown to decrease with age and are even lower in patients suffering from AD. The ability to raise IGF-1 levels could, therefore, provide an effective treatment or preventative for AD.

Research in elderly patients has found that MK-677 increases IGF-1 levels substantially, but does not alter the progression of AD once it has been diagnosed[9]. There is interest, however, in attempting to understand whether it can prevent AD. Unfortunately, such trials take extensive amounts of time and money. Research into the ability of MK-677 to prevent AD-like neurodegeneration in animal models actually contradicts the human study just discussed. This animal research is actually much newer and suggests that MK-677, more than a curative agent, is an excellent preventative. In this research, Mice that were genetically predisposed to developed AD but that were treated with MK-677 starting at three months of age showed reduced amyloid beta deposition and resulting decreases in neuron and synapse loss. In other words, MK-677 appeared to prevent the onset of AD, even in genetically predisposed mice, as long as it was started before significant amyloid beta accumulation[10]

Of course, the above findings are further supported by research into obesity and AD. Research in overweight mice shows that peripheral clearance of amyloid beta is impaired and that increasing IGF-1 levels helps to ameliorate this dysfunction. Unfortunately, this has almost no effect on levels of amyloid beta in the brain, suggesting that IGF-1 is not crossing the blood-brain barrier (BBB) very well.

MK-677 and Sleep

MK-677 has more robust effects on sleep than any of the GHRPs. Research in young adults shows that MK-677 increases stage 4 sleep duration by 50% and increase REM sleep by 20%. In older adults, the results are even more profound, with REM sleep increasing by as much as 50% and REM latency decreasing substantially[11].

Stage 4 sleep is generally considered to be the most restful stage of sleep and critical to preserving waking brain function. Stage 4 is also when most serious tissue repair and wound healing takes place. In children, it may be associated with growth and development. Prolonging this stage of sleep could be beneficial to muscle recovery, brain function, and development.

REM sleep isn’t clearly understood, but we know that babies spend half their sleep time in REM and that this number declines with age. REM may be critical in the consolidation and reinforcement of memories, but no one really knows. The ability to prolong REM in animal models could make MK-677 a important tool for understanding the functions of sleep better than we ever have before.

MK-677 and Heart Health

It has long been known that aging leads to impairment of stem cell function. Endothelial progenitor cells (EPCs) are stem cells important in the regeneration of blood vessels. A decline in EPCs has been thought to be a risk factor for the development of atherosclerosis, which can lead to high blood pressure and heart attack among other problems. Research in mice shows that increased GH levels can help to reverse the age-related decline in EPCs and may therefore be useful in preventing heart disease[12], [13].

Further supporting the importance of GH in cardiac health is that fact the nitric oxide levels decline with age. Nitric oxide (NO) is an important regulator of blood vessel health and is critical in controlling blood pressure. GH treatment has been shown to increase NO synthase expression and thus NO levels in mice.[14] This could ultimately be an effective way to regulate blood pressure and reduce risk of a number of cardiac diseases, kidney disease, and even stroke.

MK-677 Summary

MK-677 is a non-peptide ghrelin/growth hormone secretagogue agonist that has been shown to raise GH and IGF-1 levels in both animal and human testing. The compound has gone through several human clinical trials and is generally considered to be safe and relatively free of side effects, though it has not yet been approved for human use outside of clinical trials.

Research in both animals and humans shows that MK-677 may have important benefits for appetite, body composition, muscle strength, cardiac health, and neurologic function. Studies have shown that MK-677 may have particular benefit in promoting vascular health and helping to stave off some of the most prevalent diseases in industrial societies (e.g. atherosclerosis, Alzheimer’s disease, etc.).

MK-677 also appears to have profound and beneficial effects on sleep quality. It may not only provide an effect means of improving sleep quality and probing the finer details of the sleep cycle, but it’s ability to improve sleep may help to explain some of its neurological benefits. More research needs to take place in this arena, but MK-677 shows exceptionally promising benefits in improving sleep quality.

Interestingly, research seems to suggest that the greatest benefits of MK-667 are derived when it is taken for long periods of time as a preventative. Research may help to shed light on this particular phenomenon and set the stage for MK-677 and similar developments to act as preventatives for some of the most devastating diseases associated with age.

Article Author

The above literature was researched, edited and organized by Dr. E. Logan, M.D. Dr. E. Logan holds a doctorate degree from Case Western Reserve University School of Medicine and a B.S. in molecular biology.

Scientific Journal Author

Ralf M Nass, MD attended medical school at University of Bochum, Germany, and completed my residency and fellowship at University of Munich, Germany and University of Virginia (neuroendocrinology). He specialized in Endocrinology with focus on diabetes mellitus (inpatient and outpatient), thyroid disease, pituitary disease, and PCOS. In my life outside of work, I enjoy the outdoors, hiking and sports.

Ralf M Nass, MD is being referenced as one of the leading scientists involved in the research and development of VIP. In no way is this doctor/scientist endorsing or advocating the purchase, sale, or use of this product for any reason. There is no affiliation or relationship, implied or otherwise, between Peptide review and this doctor. The purpose of citing the doctor is to acknowledge, recognize, and credit the exhaustive research and development efforts conducted by the scientists studying this peptide. Barbara B. Kahn is listed in [2] and [6] under the referenced citations.

MK-677, commonly known as Ibutamoren or Oratrope, is a non-peptide growth hormone secretagogue that has attracted significant research interest due to its ability to stimulate the ghrelin receptor and increase endogenous growth hormone (GH) and insulin-like growth factor-1 (IGF-1) production. Unlike peptide-based growth hormone secretagogues, MK-677 is orally active and demonstrates a relatively long half-life, making it a commonly studied compound in aging, metabolism, sleep, muscle biology, and endocrine research.

As demand for MK-677 research products continues to grow, researchers must carefully compare suppliers based on purity, analytical testing, pricing, product documentation, and vendor reputation.

This MK-677 Vendor Price Comparison Guide helps researchers evaluate suppliers using objective criteria including:

• Product Pricing

• Cost Per Milligram

• Product Purity

• Third-Party Testing

• Certificate of Analysis (COA)

• Vendor Reputation

• Customer Reviews

• Shipping Performance

• Product Availability

• Overall Value

Whether you're looking for the lowest-priced MK-677 vendor, the highest-purity supplier, or vendors offering transparent quality control documentation, this guide can help simplify your research sourcing decisions.

Explore MK-677 Vendors by Criteria

Most Popular MK-677 Vendors

Compare suppliers frequently chosen by research institutions, laboratories, and research chemical buyers.

Highest Reviewed MK-677 Vendors

Discover suppliers with strong customer feedback and positive marketplace reputations.

Lowest Price MK-677 Vendors

Identify vendors offering competitive pricing and attractive cost-per-milligram value.

Highest Purity MK-677 Vendors

Review suppliers providing extensive purity testing and analytical verification.

Best Value MK-677 Vendors

Compare overall value based on quality, testing standards, pricing, shipping reliability, and customer support.

Fastest Shipping MK-677 Vendors

Evaluate fulfillment speed, delivery performance, and packaging quality.

Newly Listed MK-677 Vendors

Explore recently added suppliers offering MK-677 research compounds.

What Is MK-677 (Ibutamoren)?

Overview

MK-677, also known as Ibutamoren, is an orally active, non-peptide compound that functions as a selective agonist of the ghrelin receptor.

Researchers have investigated MK-677 because of its ability to stimulate the body's natural secretion of:

• Growth Hormone (GH)

• Insulin-Like Growth Factor-1 (IGF-1)

Unlike exogenous growth hormone administration, MK-677 stimulates endogenous hormone release while preserving natural pulsatile secretion patterns.

MK-677 Is Not a Peptide

Understanding MK-677 Classification

Although often discussed alongside peptides and growth hormone secretagogues, MK-677 is not technically a peptide.

MK-677 is classified as a:

• Non-peptide growth hormone secretagogue

• Ghrelin receptor agonist

• Synthetic small-molecule compound

Its biological effects are often compared to certain GHRPs because both influence growth hormone secretion pathways.

Molecular Characteristics

Chemical Information

Researchers evaluating MK-677 products should review the following specifications:

Compound Name

MK-677

Common Names

• Ibutamoren

• Oratrope

• L-163,191

Molecular Formula

C27H36N4O5S

Molecular Weight

528.7 g/mol

CAS Number

159634-47-6

PubChem CID

9939050

Research Classification

Growth Hormone Secretagogue

Compound Type

Non-Peptide Ghrelin Receptor Agonist

Why Researchers Compare MK-677 Vendors

Product quality and analytical verification can vary significantly between suppliers.

Vendor differences may include:

• Purity percentages

• Manufacturing standards

• Batch consistency

• Analytical verification

• Storage procedures

• Third-party testing

• Shipping methods

• Customer service quality

Selecting a supplier based solely on price may overlook important quality indicators.

How We Compare MK-677 Vendors

Third-Party Laboratory Testing

Independent laboratory verification remains one of the strongest indicators of supplier reliability.

Researchers should prioritize vendors that provide:

• Third-party purity testing

• Identity verification

• Batch-specific reports

• Analytical documentation

Certificate of Analysis (COA)

A COA should include:

• Product identity

• Purity results

• Lot Number

• Testing date

• Analytical methodology

Product Purity

Purity is one of the most important factors when sourcing MK-677 for research.

Higher-purity products may provide improved consistency across experimental applications.

Cost Per Milligram

Comparing only bottle prices can be misleading.

Cost Per Milligram Formula

Product Price ÷ Total Milligrams = Cost Per Milligram

This provides a more accurate comparison of value among suppliers.

Customer Reviews

Customer feedback can provide insight regarding:

• Product consistency

• Shipping speed

• Packaging quality

• Support responsiveness

• Overall purchasing experience

Vendor Reputation

Established vendors often demonstrate:

• Long-term industry presence

• Reliable quality-control procedures

• Transparent testing standards

• Consistent inventory availability

Current Research & Evidence

Growth Hormone Research

MK-677 is primarily investigated for its ability to stimulate endogenous growth hormone production through activation of the ghrelin receptor.

Research has demonstrated increases in growth hormone and IGF-1 levels in both animal and human studies.

Somatopause Research

Researchers have investigated MK-677 within the context of age-related declines in growth hormone production, often referred to as somatopause.

Research interest focuses on understanding how growth hormone signaling changes with age and impacts body composition and metabolic function.

Lean Body Mass Research

Experimental studies have examined relationships between MK-677, GH signaling, and changes in lean body mass.

Researchers continue evaluating mechanisms that influence:

• Muscle biology

• Protein metabolism

• Nitrogen balance

• Body composition

Appetite Research

Because MK-677 activates ghrelin receptors, researchers have extensively studied its effects on appetite signaling and feeding behaviors.

Research continues to investigate how ghrelin-mediated pathways influence metabolism and energy regulation.

Key Findings on MK-677 Research

Growth Hormone & IGF-1 Elevation

One of the most consistent findings in MK-677 research is its ability to increase circulating levels of growth hormone and IGF-1.

Researchers often use MK-677 as a tool to investigate endocrine signaling and hormone regulation pathways.

Sleep Quality Research

MK-677 has generated substantial research interest because of its relationship with sleep architecture.

Studies have examined:

• REM sleep

• Deep sleep stages

• Growth hormone secretion during sleep

• Recovery-related biological processes

Its impact on sleep remains one of the most frequently discussed areas of MK-677 research.

Body Composition Research

Research has evaluated the relationship between growth hormone signaling and:

• Lean tissue maintenance

• Bone metabolism

• Protein utilization

• Body composition changes

MK-677 continues to be studied as a tool for examining these biological pathways.

Bone Health Research

Experimental investigations have explored relationships between MK-677 and markers associated with bone remodeling and skeletal biology.

Areas of interest include:

• Bone turnover

• Bone mineral metabolism

• Skeletal maintenance pathways

Neurological Research

Researchers have investigated the relationship between IGF-1 signaling and neurological function.

Studies involving MK-677 have examined:

• Cognitive biology

• Neurodegenerative research

• Amyloid-beta pathways

• Age-related neurological changes

Cardiovascular & Vascular Research

Research has explored the relationship between growth hormone signaling and:

• Endothelial biology

• Vascular repair mechanisms

• Nitric oxide pathways

• Cardiovascular aging processes

Product Quality & Analytical Testing

Why Testing Matters

Research-grade MK-677 should undergo analytical verification to confirm:

• Identity

• Purity

• Stability

• Potency

• Batch consistency

Common Testing Methods

High-Performance Liquid Chromatography (HPLC)

Used to evaluate compound purity and identify impurities.

Mass Spectrometry (MS)

Used to verify molecular identity and molecular weight.

Identity Testing

Confirms that the product matches expected specifications.

Stability Testing

Evaluates compound integrity during storage.

Batch Consistency Testing

Measures consistency across production lots.

Understanding MK-677 Pricing

Several factors influence pricing among vendors.

Product Purity

Higher-purity products often command premium pricing.

Analytical Verification

Comprehensive testing programs increase supplier costs but improve transparency.

Manufacturing Standards

Strict quality-control procedures may contribute to higher prices.

Product Format

Pricing may vary depending on:

• Capsules

• Tablets

• Solutions

• Powder formulations

Brand Reputation

Established suppliers frequently charge more due to proven reliability and customer trust.

MK-677 Vendor Evaluation Checklist

Quality Standards

✅ Third-party testing available

✅ Certificate of Analysis provided

✅ Identity verification documented

✅ Purity information disclosed

✅ Batch-specific testing available

Vendor Reliability

✅ Positive customer reviews

✅ Responsive customer support

✅ Transparent business information

✅ Reliable inventory availability

Purchasing Experience

✅ Secure checkout process

✅ Shipping tracking available

✅ Clear refund policy

✅ Consistent order fulfillment

Red Flags When Comparing MK-677 Vendors

Testing Concerns

❌ No third-party testing

❌ Missing COAs

❌ Outdated laboratory reports

❌ Unverified purity claims

Transparency Issues

❌ Hidden product specifications

❌ Missing batch numbers

❌ Limited analytical documentation

❌ No company contact information

Service Concerns

❌ Frequent stock shortages

❌ Poor customer communication

❌ Consistently negative reviews

❌ Unclear shipping policies

How to Choose the Best MK-677 Vendor

Prioritize Testing Transparency

Choose suppliers that provide third-party testing, batch data, and Certificates of Analysis.

Compare Overall Value

Evaluate purity, testing standards, and customer support alongside price.

Review Documentation

Verify identity testing, purity reports, and batch-specific laboratory documentation.

Consider Vendor Reputation

Established suppliers with strong customer reviews often provide more reliable experiences.

Match Product Format to Research Needs

Different formulations may be better suited to specific laboratory applications and study designs.

Frequently Asked Questions

What is MK-677?

MK-677 (Ibutamoren) is a non-peptide growth hormone secretagogue that acts as a selective ghrelin receptor agonist.

Is MK-677 a peptide?

No. MK-677 is not a peptide. It is a synthetic small-molecule compound.

Why compare MK-677 vendors?

Supplier quality, testing standards, product purity, pricing, and documentation can vary substantially between vendors.

What should I review before purchasing?

Researchers should evaluate:

• COA availability

• Product purity

• Identity verification

• Third-party testing

• Vendor reputation

• Customer reviews

Why is third-party testing important?

Independent testing helps verify product identity, purity, and consistency.

Is the lowest-priced supplier always the best choice?

Not necessarily. Product quality and testing transparency are often more important than price alone.

How often should vendor comparisons be updated?

Pricing, product availability, testing documentation, and vendor policies frequently change and should be reviewed regularly.

Final Thoughts

MK-677 remains one of the most widely researched growth hormone secretagogues due to its oral bioavailability, long duration of action, and ability to elevate growth hormone and IGF-1 levels through endogenous signaling pathways. Researchers continue investigating its potential role in studies involving aging, sleep, metabolism, body composition, bone biology, endocrine regulation, and neurological function.

When comparing MK-677 vendors, researchers should prioritize laboratory testing, transparency, purity documentation, supplier reputation, and overall value. A structured comparison process can help identify suppliers that best align with specific research requirements.