Chemical Structure

Mechanism of Action

Mk-677 (Ibutamoren) is a growth hormone secretagogue that mimics the action of ghrelin, the "hunger hormone." By binding to ghrelin receptors, it stimulates the release of growth hormone and IGF-1 from the pituitary gland without affecting cortisol levels. This promotes muscle growth, fat metabolism, and potentially other health benefits.

Class of Compound

Selective agonist

Street Names

Nutrobal, L-163,191


  • Increased Growth Hormone
  • Increased Apetite.

Side Effects and Dangers

  • Water Retention and Edemae
  • Muscle and Joint Pain
  • Increased Appetite
  • Elevated Blood Sugar Levels
  • Lethargy or Fatigue
  • Nausea
  • Potential Increase in Tumor Growth

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