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Cancer Risk Elevated levels of insulin-like growth factor-1 (IGF-1), which is the downstream effect of GH activity, have also raised theoretical concerns about an increased risk of cancer: According to Roberts, IGF-1 promotes cellular proliferation and inhibits apoptosis, two mechanisms that may contribute to the development of cancer cells in predisposed individuals (22)

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Substances that are absorbed through the buccal route go directly into the systemic circulation and this eliminates disadvantages imposed by oral intake, such as the decreased ability of GSH to pass through the gastrointestinal tract as an intact molecule