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Human growth hormone has been known to improve physical capacity of individuals by stimulating collagen synthesis in the skeletal muscle and tendons, increasing muscle strength and improving exercise performance as a result.
In the International Journal of Endocrinology, 14 healthy men at the ages of 50 to 70 were randomized into two groups for a study. Seven subjects were administered HGH therapy with seven placebo subjects, and they were re-evaluated after six months.
After six months, there was a significant increase in the leg press responsiveness muscles in the growth hormone group.
