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Report Debunks Tainted Deer Antler Spray Theory

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IGF-1: Why MLB Players Should Be Worried

I know what you’re thinking. What is IGF-1? Insulin-like growth factor (IGF-1) is a hormone that all humans produce.  It is made when the pituitary gland produces growth hormone (GH). The GH is then delivered to the liver where it is transformed into IGF-1.