Jeffrey J. Rock, better known as Gavin Kane in the bodybuilding world, was recently sentenced to 5 years probation and 15 months community and home confinement for his role in the Internet distribution of Jintropin human growth hormone in the United States. Jeffrey Rock operated as an internet HGH source using the alias Propeptides. He marketed human growth hormone to bodybuilders through Gavin Kane Enterprises and RockHard Physique and related websites, GavinKane.com and Propeptides.com.

Jeffrey Rock aka Propeptides was one of the major players involved in the distribution of Jintropin brand human growth hormone in the United States; he worked directly with GeneScience Pharmaceuticals in China to import/smuggle and distribute HGH to bodybuilders in the U.S. Rock was indicted on six charges including one count of smuggling human growth hormone into the United States, two counts of distribution of growth hormone and three counts of money laundering. Rock faced a total of 60 years in prison and $1.5 million in fines. He faced 20 years in prison for the single count of smuggling HGH alone under federal sentencing guidelines.

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