Deer Antler Velvet Extract Tasty Lozenge 82.5 ng** New Zealand Sourced IGF-1 (Insulin-Like Growth Factor) is a small polypeptide that plays a critical role in the proper regulation of adult cellular growth in almost all tissue types.* NOW® IGF-1 is extracted from New Zealand deer antler velvet. Competitive athletes who are regularly tested should check with their sanctioning body for the status of this supplement. ** \"ng\" is the abbreviation for nanograms (1 billionth of a gram) Natural color variation may occur in this product.