-15%MK-677 (Ibutamoren) Capsules
12.5mg per capsule · 60 capsules · GH Secretagogue · Limitless Life Nootropics
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PeptideDeck
≥98% Purity
Third-party verified
60 Capsules
12.5mg each
GMP Compliant
USA manufactured
GH Secretagogue
Non-peptide compound
About MK-677 (Ibutamoren)
MK-677 (Ibutamoren) is a potent, orally active non-peptide growth hormone secretagogue. It mimics the action of ghrelin by binding to the growth hormone secretagogue receptor (GHSR) in the brain, stimulating pulsatile release of growth hormone from the pituitary gland. Unlike exogenous GH administration, MK-677 preserves the natural pulsatile pattern of GH secretion and does not suppress endogenous production. It also significantly increases IGF-1 levels, which persist throughout the dosing period.
Product Specifications
Recommended Dosage
Based on clinical studies and community protocols. Not medical advice.
Note: Common side effects include increased appetite, temporary water retention, mild initial lethargy, and potential blood sugar elevation. Monitoring fasting glucose is recommended.
Key Benefits
Growth Hormone & IGF-1 Elevation
MK-677 mimics ghrelin and binds to the GHSR (growth hormone secretagogue receptor), stimulating pulsatile GH release from the pituitary gland. Studies show sustained increases in serum GH and IGF-1 levels without suppressing natural GH production.
Muscle Mass & Body Composition
MK-677 can increase lean body mass and improve body composition. In clinical trials with elderly subjects, ibutamoren reversed diet-induced catabolism and improved nitrogen balance.
Sleep Quality Improvement
MK-677 increases the duration of REM sleep and stage IV (deep) sleep by up to 50%. Better sleep architecture contributes to enhanced recovery, mood, and overall well-being.
Bone Mineral Density
Long-term use of MK-677 increases bone turnover markers and bone mineral density, particularly beneficial for older adults. Enhanced osteoblast activity supports stronger, healthier bones.
Recovery & Wound Healing
Through elevated GH and IGF-1 signaling, MK-677 accelerates tissue repair, reduces recovery time, and supports connective tissue health — ideal for athletes and active individuals.
How MK-677 Works
MK-677 (Ibutamoren) functions as a ghrelin mimetic — it binds to the growth hormone secretagogue receptor (GHSR) in the hypothalamus and pituitary gland, the same receptor that the endogenous hunger hormone ghrelin activates. This binding triggers a cascade that stimulates pulsatile growth hormone release from somatotroph cells in the anterior pituitary.
Importantly, MK-677 increases GH and IGF-1 without significantly affecting cortisol levels. Unlike exogenous GH injections, ibutamoren preserves the natural episodic secretion pattern of growth hormone, including the critical nocturnal GH surge during deep sleep. This pulsatile pattern is believed to be more physiologically favorable than the flat, supraphysiologic levels produced by GH injections.
MK-677 also activates the GH axis through a second mechanism: it mildly suppresses somatostatin (the hormone that inhibits GH release), further amplifying the GH response. The result is a robust, sustained increase in both GH and IGF-1 that can persist for months of continuous administration without significant desensitization of the GH axis.
Frequently Asked Questions
What is MK-677 (Ibutamoren)?
MK-677, also known as Ibutamoren or Nutrobal, is a non-peptide growth hormone secretagogue that mimics the action of ghrelin. It binds to the GHSR (growth hormone secretagogue receptor) in the brain, stimulating pulsatile release of growth hormone from the pituitary gland and increasing IGF-1 levels.
Is MK-677 a SARM?
No. MK-677 is not a selective androgen receptor modulator (SARM). It is a growth hormone secretagogue — it works on the ghrelin receptor, not the androgen receptor. It does not affect testosterone, estrogen, or other sex hormones directly.
Does MK-677 suppress natural testosterone?
No. Unlike anabolic compounds, MK-677 does not suppress the hypothalamic-pituitary-gonadal (HPG) axis. It specifically targets the GH/IGF-1 axis through the ghrelin receptor, so no post-cycle therapy (PCT) is needed for testosterone recovery.
Should I take MK-677 in the morning or at night?
Most people take MK-677 before bed. This timing aligns with the body's natural nocturnal GH pulse and can enhance sleep quality. Taking it at night also helps manage the appetite increase, since you'll be asleep during peak hunger effects.
Does MK-677 affect blood sugar levels?
Some studies have noted mild, transient increases in fasting blood glucose and insulin resistance, particularly in the first few weeks. These effects tend to stabilize over time but should be monitored. Individuals with pre-existing insulin sensitivity concerns should consult a healthcare professional.