What is the ideal IGF-1 range?
For fat loss (and to maximize other benefits tbh) you want to push the dose as high as possible.
That’s limited by 2 factors.
How tolerable are sides.
And IGF-1 Z score.
The Z score is really more important than the raw IGF-1 number.
Z is calculated based on your sex / age and that labs particular testing method.
Z score 0 is the mean for your demographic.
Z score 2 is the physiological limit. Doctors treating adults for GH deficiency keep it below 2.
Z score up to 3 is still safe long term.
Above 3 you start to risk acromegaly symptoms over the long term.
So you can start at 2iu, check IGF-1 z score, and if sides are tolerable, and Z below 3, you have room to safely increase dose if you want.
You can see how the same IGF-1 300 is a different Z at different ages (do NOT calculate using this chart, only the lab can provide precise Z score), Above 2 docs would reduce dose. Real risk from what studies show begins above 3.
2iu could result in IGF-1 500 in one person, and 8iu might only hit IGF-1 150 in another.
That’s why IGF-1(really Z score) not IU is what to base your dose on.
IGF-1 regulates cell growth, that’s where essentially all the risk of permanent damage is. Endocrinologists used to calculate rHGH dose as “x weight=x IUs” now it’s “start low and increase IUs based on IGF-1 / Z score”. Most would aim for a Z around 1, to be conservative. For max PED like benefits, while staying safe(ish) we”re looking for high 2.x
Roughly Z score 6 for 5 years. Enlarged organs, jaw, hands, feet etc. ON JUST 2IU