The large argument is either human growth hormone will stretch out the outer barrier of human endurance. Many researchers argue that the utmost life span is not unchangeable. With advancing equipment, such as the capacity to engineer the genes at will. They will force back the boundary to 150 years and past interventions like human growth hormone will authorize us to live long enough so that the latest interventions that will get the next leap in life span will be on board.

But even though the proof is very preliminary, there are a number of powerful indicators that human growth hormone could not only prolong the quality of life but the quantity as well. At present, the only workable way to test a life span intervention is to exercise a short lived animal species, if at all possible a mammal, which bears a number of resemblance to the human circumstances. In 1990, two scholars at North Dakota State University try to answer this argument. They gave IGF-1 infections to a party to twenty-six mice that were seventeen months old, or other that three-quarters by way of their average life span of twenty-one months. The animals were manifest manifestation of aging and members of the first colony of sixty mice had begun to pass on .

A control unit of twenty-six mice that were the same age obtained placebo infections of saline solution. After thirteen weeks, sixteen animals, or 61 percent in the control set has died, while all but two, or 97 percent, of the human growth hormone treated animal were yet alive! In other words, the vast majority of the treated animals had already lived lengthened than the life expectancy for that species.

At this place in the testing, the scholars sacrificed four animals from all group to look at their immune function. The left over mice were reserved alive untreated for an added four weeks. For the duration of this period, the control collection had entirely died out, while merely one mouse from the hormone treated group died. The scientist resumed hormone therapy for an added six weeks until they had fatigue their stock of human growth hormone and were required to finish the conduct test. Sacrificing all the animals. Only one mouse died all through this time of the research. This means that absent of the original group of 26 treated mice, just four mice died of uncontrolled causes.

This left 18 mice who were yet alive 22 weeks past therapy had begun, while the whole control group had died entirely after 16 weeks. The after-effects, say the scholars, say that long term growth hormone therapy extend the average life expectation of the hormone treated mice significantly.