20-hydroxyecdysterone is just one of couple effective ecdysteroids.
There are some russian studies.done pn skateboard guys,powerlifters etc.
It showed increase in endurance, strength,size etc.
Ecdysteroids are pretty effective and one of my fav is Turkesterone. Increased my Hemoglobin after one week.
Ecdysteroids works but its expencive.
The good thing with them are they are healthy too. Not only do they increase protein synthesis,nitrogen retention, maximal oxygen uptake etc. They are adaptogens.
Honestly, if your goal is to build size and strength ArA and PA would do the same job for less money. But if you have more than enough money, adding ecdysteroids from trusted source would be a nice add .
The sad thing is,nowadays, to many brands do claim they have real ecdy..many brands are underdosed, some even dont contain ecdy at all and some use cheap raws just containing trace of ecdysteroids.
Real ecdysteroids should provide nice pumps,musclefullness,increased endurance,strength and size