Which of the following statements about human growth hormone (HGH) is true?

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HGH levels begin declining by age 30. Studies have not shown HGH to be an effective treatment for Alzheimer's disease, although it has been used to treat this disease. In addition, injecting growth hormone appears to boost lean body mass and improve physical function, but it has not been proven to positively affect these items. There is evidence that this hormone supplement is more harmful than beneficial. Two studies have associated HGH with increased mortality rates.

Which of the Following Statements About Human Growth Hormone (HGH)