MK-677 (Ibutamoren): A Tracking Guide for an Oral GH Secretagogue

MK-677, also called ibutamoren, is an orally active ghrelin-mimetic growth hormone secretagogue. It is frequently mislabeled and sold alongside SARMs, but it is not a SARM - it does not bind the androgen receptor. Instead it mimics ghrelin at the GH secretagogue receptor, prompting the pituitary to release more of the body's own growth hormone, which in turn raises IGF-1.

This is an educational tracking guide, not medical advice or a recommendation. MK-677 is an unapproved research chemical, and products sold online are frequently mislabeled or underdosed.

What it does

• Raises pulsatile GH release and downstream IGF-1
• Increases appetite, sometimes sharply, via ghrelin signaling
• Commonly causes water retention, especially early on
• Can raise fasting glucose and reduce insulin sensitivity
• Often reported to deepen sleep, though this is variable

Typical protocol shape

• Taken once daily, orally, with timing (morning vs night) chosen around appetite and sleep effects
• Doses commonly reported in research literature; this guide does not prescribe one
• Effects on body composition build slowly over weeks, not days

What to track daily

• Bodyweight, noting that early gains are largely water
• Appetite and hunger intensity
• Sleep quality and how rested you feel
• Any hand or ankle puffiness or joint stiffness

What to track weekly

• Waist measurement to separate water and fat from muscle
• Morning resting heart rate and blood pressure
• Lethargy or carb cravings that may hint at glucose changes

Bloodwork worth doing

• Fasting glucose and HbA1c - MK-677 can worsen glycemic control
• IGF-1 to confirm the compound is doing anything biologically
• Fasting insulin if you can get it

Realistic expectations

• Water weight and appetite change fast; real tissue change is slow
• It is not an androgen and will not replicate a steroid or SARM
• Elevated appetite is a double-edged effect - useful for bulking, hard for cutting

Safety notes

The most consistent real-world concerns are worsened fasting glucose and insulin sensitivity, water retention, and appetite that can be hard to manage. People with any diabetes risk, high blood pressure, or a history of cancer should be especially cautious given IGF-1 elevation. Because it is unregulated, mislabeling and contamination are genuine risks, and long-term human safety data is limited. Anyone using it should track glucose and consider periodic bloodwork.

Peptid AI is an educational and self-tracking tool. Nothing in this post is medical advice. Doses mentioned reflect what is commonly reported in research literature — they are not recommendations. Always consult a qualified physician before starting, changing, or stopping any protocol.