I empty a couple of probiotics capsules into the shaker before I mix my Huel. I always found protein powder with added probiotics was easier on my stomach. I’m doing the same with Hurl, but it’s probably not required.
I usually have a little Danone probiotic drink too when I get up in the morning. I don’t necessarily believe any of the hype about that specific brand’s health benefits (bifidus-whateveritis), but I do enjoy drinking a little yoghurty drink first thing. I don’t usually have much of an appetite for any kind of food first thing, and a quick shot of a little yoghurt-based drink seems to settle my stomach just right. I expect a little greek yoghurt mixed with milk or water would have exactly the same effect for me - I should really try that instead as it’d probably be cheaper/less packaging.