The best advice I can give is to stick with it for a few days… Your taste buds will get used to the sweetener. That said, it is very sweet.
Over time, you can move to a mix of Vanilla and U/U. A 50/50 split between the two works very well. I’m now using two-thirds U/U plus one-third Vanilla, and that’s perfect for me, though I expect most people would prefer 50/50.
EDIT: Further to the above comment from @nykampmp - adding unsweetened flavours does help. Coffee granules, cinnamon, ginger and cocoa are all very good flavours, either individually or mixed in various combinations, and they offset some of the sucralose sweetness
Just bear in mind, anything you add will have calories (a large banana has around 120 kcal) - so if you’re doing Huel for weight management, take that into account. 5g unsweetened cocoa only adds around 20 kcal.
Try cinnamon powder, if you get the chance. It works really well with vanilla Huel
Most people would probably agree that the sweetness of these kinds of products go light years beyond just making them palatable from solely a “taste” standpoint. So there’s gotta be some ulterior motive. In my opinion.
I hope I don’t come across as one of those fancy schmancy armchair nutritionist wannabes. But from my layman’s understanding of some of the literature, my theory is that manufacturers of these powdered food products are banking on the brain’s and the gut’s primal reaction to sweetness — which typically is to make you feel “satiated” [a.k.a., no longer hungry], basically.