What it is: A growth hormone secretagogue (not a SARM) that drastically increases GH and IGF-1 in humans.
Research snapshot: There is human clinical research showing increases in GH/IGF-1 and changes in body composition markers, but outcomes vary and side effects are common.
Mechanism:
- Mimics ghrelin signaling → increases GH pulses → raises IGF-1
- Often increases hunger and can change water balance
What users report (common):
- Increased appetite (very common)
- Better sleep quality (some), vivid dreams (some)
- “Fuller” look / scale weight increases (often water + glycogen)
- Improved recovery perception
Common issues / risks reported:
- Water retention / edema
- Lethargy in some
- Increased appetite can wreck fat loss
- Glucose/insulin markers can worsen in susceptible people (a big one)
- Blood pressure can creep via water retention
Reality check: MK-677 is popular because it “feels” like something is happening (hunger + water + sleep). But the long-term win depends on whether you manage the tradeoffs.
Did MK-677 help sleep/recovery—or did appetite and water retention outweigh the upside?