How long does it take for nutropin (human growth hormone) to work?

For what purpose?: Hgh, which is what Nutropin (human growth hormone) is, immediately raises igf-1 levels, which is synthesized primarily in the liver. For short statured children, you will see growth in height within a month. For adults legitamely using it, beneifts accrue within months, ie. Increased bone density, thicker skin, etc. I do not know how quickly .It works when taken for athletic or anti-aging purposes. No studies.