Muscle Supplements: Is Human Growth Hormone (HGH) safe to take for improving athletic performance? Yes, growth hormone is safe for improving athletic performance, because of: active stimulation of the growth of different types of tissues (cartilage, bone and muscle) high safety. Observing the correct technology and dosage, it is possible to achieve high results in a short time after stopping the course, muscle volumes are preserved the secretion of natural sex hormones is not suppressed The limited data we have shows that the effects of growth hormone on the athletic performance show us that HGH increases lean body mass in the short term. New studies show evidence that HGH does increase performance, but not as much as previously thought by some.