I wanted to get me some but the price was just a little bit to high at the time...
GPLC can be very beneficial. It is in APS.
I've used Glycocarn in AEN's presurge before. That was some good stuff. I can't comment on it alone but I plan to try some stand alone eventually. Go to the glycocarn website and they have all the products including it, and you can use that list to search around for those products.
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