Either the GHK-CU isn't suitable for your biochemistry, your protocol needs adjustment, or an external factor is interfering
Mount Sinai Health Library
Connective Tissue Benefits BPC-157 is widely studied for its ability to heal and regenerate connective tissues, including tendons, ligaments, muscles, and bones, making it popular in sports medicine and injury recovery
Dose response: metabolically healthy individuals have a distinct experience Even after adjusting for weight-based dose exposure, retatrutides receptor engagement produces a different effect depending on the body it lands in
Why GHK-Cu Is Everywhere Right Now In 2025, GHK-Cu has been reframed by both dermatology professionals and beauty editors as a next-generation skin-support ingredient, especially for people who want visible skin support for collagen production, wound healing, and even scalp care without irritation