IGF-1 (Insulin Growth Factor-1) is a compound produced primarily in the liver through a conversion of HGH (Human Growth Hormone). HGH is secreted by the pituitary gland & is essential for growth & optimum immune system function*. This dietary supplement will be a promising addition to the nutrition regimen of fitness enthusiasts. NOW continues to offer cutting edge nutritional supplements from around the world. Sorbitol is safe for people, but harmful to dogs. Do not feed to pets. As a dietary supplement, take 1 lozenge 1 to 2 times daily. Chew lozenge, or allow lozenge to slowly dissolve & swallow. Consider taking this product in combination with NOW® Arginine Power Super Stack, Branched Chain Amino Acids & Tribulus. Fructose, Sorbitol, Cellulose, Stearic Acid (vegetable source), Citric Acid, Natural Flavors & Natural Beet Powder.