Peter Attia· MD
But that is it can be difficult because you could have a person on a ketogenic calorie deprived diet model who has an IGF-1 that is on the low end of the reference range be manually administering growth hormone and be using a higher dose than would otherwise be necessary to get to high normal optimal function put in quotation marks. Um, so it that's the best proxy we have as far as I'm aware is that serum biioarker IGF-1