Not yet investigated
What we have so far
Growth hormone's actual messenger. High is associated with cancer, low with frailty and cognitive decline, and the optimum is somewhere nobody has pinned down.
This star is on the map because the show intends to take the question apart properly — the trials, how it is actually tested, whether the thing sold is the thing studied. That work is not done yet, and nothing here should be read as a conclusion. When the investigation is published it will appear on this page.