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What is MK677?

MK-677, also known as Ibutamoren or Nutrobal, is a selective agonist of the ghrelin receptor and a growth hormone secretagogue. It belongs to the class of compounds known as growth hormone secretagogues (GHSs) that stimulate the secretion of growth hormone (GH) from the pituitary gland.

MK-677 has gained attention for its potential to increase GH and insulin-like growth factor 1 (IGF-1) levels in the body, leading to benefits such as enhanced muscle growth, improved bone density, and potentially aiding in fat loss [1].

Molecular Formula: C27H36N4O5S

Molecular Weight: 528.7 g/mol

View the HPLC Certificate here.

Source: PubChem

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MK677 Benefits:

Buy MK677 Ibutamoren Capsules here – available in 10mg capsules

MK677 Mechanism of Action

MK-677, is a growth hormone secretagogue. MK-677 functions by activating the ghrelin receptor, which is located in the brain and gastrointestinal tract. This activation leads to an increase in the release of growth hormone (GH) and insulin-like growth factor 1 (IGF-1) from the pituitary gland [1].

Unlike other compounds that target androgen receptors in specific tissues like muscles and bones, MK-677’s primary role is to elevate GH and IGF-1 levels systemically. This systemic increase in GH and IGF-1 can have various effects on the body, including promoting lean muscle growth, enhancing bone density, speeding up recovery, and potentially aiding in fat loss [2].

While MK-677 may offer benefits similar to those seen with other compounds, such as improved body composition and strength gains, it does not directly interact with androgen receptors. Understanding this distinction is crucial in recognizing how MK-677 operates and its potential impact on the body’s hormonal system.

Buy MK677 online Hungary from PharmaLabGlobal offering a convenient and set dosage for your research investigations.

Buy MK677 Ibutamoren

MK677 Ibutamoren Future Clinical Applications

Hungary Scientists have discovered that MK677 can hold the following applications in the future, however much more Hungary clinical research is required to establish the safety of this sought after compound.

Increase metabolism leading to fat loss

Numerous clinical trials have demonstrated MK-677’s ability to increase metabolism and promote fat loss stems from its influence on growth hormone (GH) and insulin-like growth factor 1 (IGF-1) levels. By elevating GH and IGF-1, MK-677 can enhance lipolysis, the process of breaking down fats for energy levels. This heightened metabolic activity leads to increased energy expenditure and potentially greater fat utilization by the body. Moreover, the boost in lean muscle mass associated with MK-677 can further contribute to a higher basal metabolic rate, facilitating sustained fat loss over time [2]. 

Muscle growth

MK-677’s role in encouraging muscle growth and lean muscle mass is primarily linked to its ability to elevate natural growth hormone (GH) and insulin-like growth factor 1 (IGF-1) levels in the body. These hormones play crucial roles in muscle protein synthesis, cell proliferation, and tissue regeneration. By promoting higher GH and IGF-1 levels, MK-677 can enhance muscle recovery, increase muscle mass, endurance and improve overall muscle strength [3].

This anabolic effect could be particularly beneficial for those looking to optimize their fitness levels and muscle-building potential, especially when combined with a structured workout routine and adequate protein intake. However currently MK677 is still considered a research chemical.

Bone density

Ibutamoren potential to improve bone density lies in its ability to stimulate the release of growth hormone (GH) and insulin-like growth factor 1 (IGF-1). These hormones are essential for bone health as they promote osteoblast activity, which is responsible for bone formation [4].

By increasing GH and IGF-1 levels, MK-677 can enhance bone mineral density and strength, potentially reducing the risk of fractures and osteoporosis. Hungary Scientists believe that this mechanism of action suggests that MK-677 could be beneficial for individuals seeking to support their skeletal health, especially those at risk of bone-related conditions or looking to maintain optimal bone density as they age.

Muscle recovery

MK-677’s ability to improve muscle recovery is closely tied to its capacity to boost growth hormone (GH) and insulin-like growth factor 1 (IGF-1) levels. By increasing GH and IGF-1 concentrations, MK-677 supports faster muscle healing recovery post-exercise by enhancing protein synthesis, reducing muscle damage, and promoting cell growth [1]. Hungary Researchers have found that this accelerated recovery can lead to reduced muscle soreness, quicker recovery between workouts, and overall better muscle adaptation to training stimuli. 


By stimulating the release of Growth Hormone, MK-677 can influence various aspects of the sleep-wake cycle, including, sleep duration and REM sleep stages [5]. The GH plays a crucial role in promoting restorative sleep by enhancing sleep efficiency and duration. Additionally, the increase in GH levels induced by MK-677 may contribute to better overall sleep patterns, leading to improved sleep quality, enhanced recovery, and potentially increased daytime alertness.

Cognitive health

By increasing growth hormone levels and IGF-1 concentrations, MK-677 may help boost cognitive processes such as memory, learning, and focus. Furthermore, the potential benefits of improved sleep quality and overall well-being associated with MK-677 use can indirectly contribute to better cognitive function [6]. 

MK677 FAQ's

Is MK677 legal Hungary? 

MK-677 (Ibutamoren) is available research purposes. However, it’s essential to note that regulations regarding the sale and use of MK-677 may vary by country and region. It’s advisable to consult local Hungary laws and regulations or seek professional advice before purchasing or using MK-677 to ensure compliance with legal requirements.

Does MK677 increase appetite?

Yes, MK-677 (Ibutamoren) is known to increase appetite as one of its primary effects. This increase in appetite is a common side effect reported by individuals using MK-677. The compound works by stimulating the release of growth hormone and IGF-1, which can lead to heightened hunger levels. It’s important for individuals considering researching MK-677 to be aware of this potential side effect and to adjust their diet and eating habits accordingly to manage any increase in appetite that may occur.

Does MK677 require a PCT?

Unlike some compounds that may suppress natural testosterone production and require a Post Cycle Therapy (PCT) to restore hormone levels post-cycle, MK-677 typically does not require a PCT.

Since MK-677 does not directly impact testosterone levels in the same way as other compounds, users generally do not experience significant hormonal disruptions that necessitate a PCT phase. 

What are the side effects of MK677?

Although MK677 is a very popular choice it does not come without the possible adverse effects of increased appetite, water retention, fatigue and insulin sensitivity.

Scientific Research

[1] Lee J, Kwon A, Chae HW, Lee WJ, Kim TH, Kim HS. Effect of the Orally Active Growth Hormone Secretagogue MK-677 on Somatic Growth in Rats. Yonsei Med J. 2018 Dec;59(10):1174-1180.

[2] Svensson J, Lönn L, Jansson JO, Murphy G, Wyss D, Krupa D, Cerchio K, Polvino W, Gertz B, Boseaus I, Sjöström L, Bengtsson BA. Two-month treatment of obese subjects with the oral growth hormone (GH) secretagogue MK-677 increases GH secretion, fat-free mass, and energy expenditure. J Clin Endocrinol Metab. 1998 Feb;83(2):362-9.

[3] Nass R, Pezzoli SS, Oliveri MC, Patrie JT, Harrell FE Jr, Clasey JL, Heymsfield SB, Bach MA, Vance ML, Thorner MO. Effects of an oral ghrelin mimetic on body composition and clinical outcomes in healthy older adults: a randomized trial. Ann Intern Med. 2008 Nov 4;149(9):601-11.

[4] Murphy MG, Weiss S, McClung M, Schnitzer T, Cerchio K, Connor J, Krupa D, Gertz BJ; MK-677/Alendronate Study Group. Effect of alendronate and MK-677 (a growth hormone secretagogue), individually and in combination, on markers of bone turnover and bone mineral density in postmenopausal osteoporotic women. J Clin Endocrinol Metab. 2001 Mar;86(3):1116-25.

[5] Copinschi G, Leproult R, Van Onderbergen A, Caufriez A, Cole KY, Schilling LM, Mendel CM, De Lepeleire I, Bolognese JA, Van Cauter E. Prolonged oral treatment with MK-677, a novel growth hormone secretagogue, improves sleep quality in man. Neuroendocrinology. 1997 Oct;66(4):278-86.

[6] Tian J, Wang T, Wang Q, Guo L, Du H. MK0677, a Ghrelin Mimetic, Improves Neurogenesis but Fails to Prevent Hippocampal Lesions in a Mouse Model of Alzheimer’s Disease Pathology. J Alzheimers Dis. 2019;72(2):467-478. 

Further Reading:

Can Females take MK-677?

Explore the safety, effectiveness, and considerations for women considering using MK-677, a growth hormone secretagogue. Delving into the science behind MK-677 and its potential benefits for muscle growth, fat loss, and overall wellness, the blog addresses common queries regarding its impact on female physiology.

Which Peptides Increase Libido?

An exploration of the most popular peptides known for their potential libido-enhancing effects. Through an insightful analysis of various peptides such as PT-141 and Kisspeptin, discover how they may positively influence sexual desire and performance. 

Explore more about sexual enhancement with Peptides

Unveiling the Potential of MK-677

This blog explores how MK-677 works to stimulate the release of growth hormone, leading to potential advantages such as increased muscle mass, improved bone density, and enhanced fat metabolism. 

Read about this powerful research compound here.

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