So you can imagine my surprise when these authors randomized 152 adults, avg 68yo, 66 of whom had MCI, to nightly subcutaneous tesamorelin 1mg/d vs placebo, of whom 137 (61 w/MCI) completed the study. Various standardized measures of cognitive function were assessed at baseline and at 10 week intervals up to 30 weeks total (10 weeks after last administration). They concluded that
tesamorelin improved cognitive function compared to placebo for both those w/baseline normal cognitive function and in those w/MCI. More importantly, not only did those who completed the study as designed (per protocol) demonstrate improvement, but so did an
intention-to-treat analysis including those who didn't finish the trial. This last point is very difficult to prove but demonstrates real world applicability in that it takes into account drop outs & loss of adherence for any reason.
For those who want to try this on their own, it should be noted that while tesamorelin more than doubled IGF-1 (insulin-like growth factor-1), it was still within the "young adult normal" range. Moreover, the greater the increase in IGF-1, the greater the executive function composite change scores. Remember my grade school analogy? This is akin to tutoring a student from D- to B+ or A-.
As an added benefit, tesamorelin caused a 7.4% loss in body fat in just 5 weeks! If you'll recall, I don't use this word "caused" lightly as it implies cause & effect. But when you analyze an RCT, you're attempting to prove causation, not just association (the only conclusion possible w/observational or epidemiologic studies). Better yet, fasting glucose, HgbA1c & oral glucose tolerance tests were not affected by tesamorelin, one of the concerns regarding growth hormone. Finally, tesamorelin leads to a more physiologic pulsatile IGF-1 response as opposed to the constant response from GH.
Bottom line:
is your brain health & cognitive function worth $45.99/d? That's the average wholesale price of a single 1mg vial of tesamorelin, the entire contents (all 1mg) of which was injected subcutaneously daily for 5 months. Or could you
put that daily $46 to better use by eating higher quality foods, exercising regularly, and getting enough rest?