Peptides went from niche bodybuilding compounds to mainstream wellness culture in under five years. The appeal makes sense on the surface, naturally occurring, targeted mechanisms, marketed as smarter than traditional pharmaceuticals. What What is the difference between HGH and HGH peptide therapy? Growth Hormone and IGF 1 Actions in the Brain and Neuropsychiatric Diseases Physiology American Physiological Society Growth Hormone Blood Level an overview ScienceDirect Topics Mechanisms of Disease: metabolic effects of growth hormone and insulin like growth factor 1 Nature Reviews Endocrinology Human conditions of insulin like growth factor I (IGF I) deficiency Journal of Translational Medicine Springer Nature Link