There's a difference between human growth hormone (HGH) and peptides like Sermorelin. Growth hormone production starts to decline in our 20s and declines by 15% every decade. As all the major hormones L Carnitine 3000 Rebel Fit Nutrition Role of carnitine in disease Nutrition & Metabolism Springer Nature Link Carnitine supplements fat burning energy metabolism L Carnitine Supplements Nature's Best Ipamorelin Sovereign Health Performance