____________________ has/have sometimes yielded dramatic results in slowing or reversing the aging process,but with some unpleasant side effects including growth of excess hair,liver damage,and abnormal growth of facial bones.

Question

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Regular use of growth hormone has been shown to have significant effects on the aging process, including increased lean body mass and improved skin elasticity. However, it can also lead to negative side effects such as excessive hair growth, liver damage, and abnormal growth of facial bones. DHEA supplements, antioxidant supplements, and calorie restriction have not been shown to have such dramatic effects on slowing or reversing the aging process.

____________________ Has/have Sometimes Yielded Dramatic Results in Slowing or Reversing