I can't really find any hydrolyzed collagen in the U.S. that is at and around 2000 kDa. Great Lakes says theirs is 2000 to 5000 kDa. Sports Research says about the same for theirs. I think BulkSupplements claimed 1000. I've been getting Great Lakes. btw I can tell the glycine in that works as far as sleep quality goes.
I did post in several occasions on this forums about collagen, my posts were always based on the conclusions of my researches about the topic leaded to.
As you may notice in my last post I included a citation from examine.com about collagen and its link (.https://examine.com/...pe-ii-collagen/ ), I invite whom is interested in collagens to read what examine.com says about, there are relatively new studies on the subject that seems to change what previously thought.
Surprisingly enough collagen, and hyaluronic acid as well, are known from quite a long time but not well researched at all, only very recently researchers started focusing more in dept on those and their mechanisms, it is a quite new field still in its infancy, I would say.
I am not going here to write about what emerges since examine and other papers do explain it much better than I possibly could.
Worth reading is the Biocell patent too, I know...patents are a pain in the neck...but this one is well wort the effort because it is quite informative about collagens and their behaviors according to latest researches (or so):
http://www.freepaten...om/8563045.html
By the way to give a try at Biocell collagen isn't going to break any bank account and may be interesting:
https://www.vitamins...ie-caps/vs-2519
Undenatured CII (UC-II®) is worth a try too, Nowfoods carries it, for example.
I would definitely drop hydrolized collagen (type 1 and 3) in favor of the above (collagen type 2) to see if practice confirms the research, which according to reviews on Amazon seems to be the case.