MK-677 (Ibutamoren)

MK-677 (also Ibutamoren or MK-0677) is an oral non-peptide ghrelin receptor agonist (GHSR). It mimics the action of ghrelin - the body's hunger hormone - and triggers growth hormone (GH) release from the pituitary.

Unlike injectable GH releasers (CJC-1295, Ipamorelin), MK-677 is orally active and has a long half-life. One tablet per day is enough for stable GH pulses over 24 hours.

MK-677 activates the GHSR (Growth Hormone Secretagogue Receptor) in the hypothalamus and pituitary. That produces two main effects:

• Stronger GH pulses: the pituitary releases more growth hormone, which prompts the liver to produce IGF-1.
• Appetite increase: ghrelin is the body's hunger hormone - more appetite is the direct consequence.

Both effects together make MK-677 the classic bulking tool: more growth hormone plus more hunger plus deeper sleep.

Oral tablet, once per day. Ideally in the evening before bed.

• 1 tablet with some water.
• Before bed makes sense - GH pulses occur naturally at night and MK-677 amplifies them.
• Plus: mildly sedating, improves sleep quality.

With evening dosing the noticeable hunger comes in the morning and during the day - exactly where it's useful for bulking.

MK-677 is well researched in mid-size human studies:

• Nass et al. 2008: 25mg per day over 2 years sustainably elevated GH and IGF-1, plus moderate gains in lean mass.
• Adunsky et al. 2011: GH axis improvement and functional recovery after hip fracture.

Phase-3 trials for sarcopenia and growth disorders ran but didn't lead to approval. Currently MK-677 runs as a research compound and in off-label use.

• Appetite increase: wanted for bulking, unwanted in a cut.
• Water retention: classic GH symptom, especially in hands and face.
• Sleep depth: usually improved, some report vivid dreams in the first weeks.
• Blood sugar: can rise slightly because GH causes insulin resistance. Caution with diabetes or prediabetes.

Dry and cool, out of reach of children. Keep original container closed.