Second time making fuel and left shake (Huel+ milk) in fridge after blending. It was in a cup with an opening for sipping. I took it to work and noticed the shake was very hard. First time I did this I used a closed lid with no issue.
Has anyone else had similar issues?
I haven’t had the issue you had, but I’ve noticed any leftover dregs in the bottom of the shaker turn to concrete if I don’t close the lid, so I would definitely keep it in an airtight container until I’m ready to drink it.
Does this mean we’ll all turn into stone? 
Medusa is that you?
Don’t worry. For many people it seems that Huel turns into the opposite of concrete after it passes through their bodies.
Yes there’s plenty of concrete evidence of that.
My reputation precedes me