even though water retention may SEEM minimal, GH does cause water retention to a certain extent no matter what. i was using matts gh going into my show and i dropped it at 3 weeks out, within 3-4 days i lost like 5lbs and tightened up significantly. i wouldnt have guessed i was holding nearly that much water from the gh, but apparently i was.

I have ran both, 6 months of Matts, and 4 months Karls. Both get the job Done, with similar side affects, however, to answer the quest specifically, Karls Samotism (hope I spelled that correctly) was hands down less water retention. Wasn't even close. That said, If I, key word "I" was going into a show, my cut will be less invasive with Karls product. This is by no means a pun toward Matts product, because I thought Matts product was very effective, however for me, and everyone is different, I held 2 times the water retention with Godtropin. Again, this is my experience, you could have a completely different reaction to both products.

I'm on matts also at 4 iu. Very minimal water retention compared to another top brand over four years ago. My hands are a little more swollen but not much. My weddin ring is a little tighter. But I have not noticed any bloating anywhere else

I'm running matts at 4iu per day. Only been on a few weeks, only thing I noticed so far is slight water retention in my ankles. Can't really see it but I can feel it when I walk in the evenings. This just started a few days ago, it's not really bad at all. Otherwise things are good