I used Sust twice ... and swore I would NEVER EVER EVER EVER EVER touch that shit again ... let alone even CONSIDERING running a clean Test Prop. No matter what PIP method I tried, how I massaged it, how hot or cold treatment protocol I followed, I could not get rid of the 'You've just been kicked by a mule on juice' muscle pain. Hate the shit ... won't touch it again ... ever. Sure, it has benefits being short estered, but unfortunately, my body cannot handle the ester ... at all.