A helpful tip for anyone finding it slimy, I drink mine from a to go cold cup with a lid through a straw. Since the mix is modestly thick this is a little like drinking a milkshake but not too difficult and I’ve never experienced a slimy feel drinking it this way.
I also use water filtered through a Pur filter pitcher and am sure to shake it thoroughly in the two stages based on the instructions, first after half water and the mix in pitcher, and then second, after filling water to the top. No blender used and always refrigerated for at least 2-3 hours but preferably overnight.
My first sips were from the cup before using the straw and there was no slime factor whatsoever and especially not a trail from my mouth to the cup. And there has also never been a slimy trail from the straw.
The experience others are having does sound a bit nasty but it makes me think something more preparation related is possibly the cause as I have not experienced this issue. Hope this info is helpful to others.