Acromegaly patients, who suffer from natural growth hormone levels of up to 100 times higher than normal, have lower stamina towards physical activity than people with regular levels.  When the patients are treated and their growth hormone levels decrease, their stamina improves.  This knowledge is part of the evidence behind the new belief that athletes who use supplemental HGH to raise their levels far above average could actually decrease their exercise tolerance, and thus hurt their athletic performance.  Further backing was provided in a study done by the Danish Institute of Sports Medicine. They found cyclists of good health and endurance “were unable to complete accustomed cycling tasks after administration of exogenous hGH” and concluded that HGH can inhibit recuperation from exercise.  Participants have also been found to have lower stamina after HGH treatment along with higher rates of fatigue. 
As you might have known by now that the bad effects of anabolic steroids cannot be paralleled by the growth hormone supplements. Where long term use of steroids can lead to male impotency and/or infections within genitals, growth hormone supplements have no such effects. Both HGH and steroid are used for muscular growth but after achieving the desired function, it’s really hard to quit using steroids. As far as HGH is concerned, it has no addictive properties because the growth hormone supplements are made from natural sources. So if you are taking HGH products, you don’t have the risk of filling your body with chemicals.