The farts. Good God the protein farts. No matter what kind I use. Brand, type, vegan, non-vegan, etc. Those damn protein shake farts can kill. The are the most unnatural smelling abominations the human body can produce. There are a number or reasons to not use protein powder supplements if you can avoid it. Actual health concerns. Yet in the end, it is the farts that stop me from using them.
I have a container going stale for this exact reason. I should try mixing a little bit of it into my smoothies to use it up, but I’ve gotten away from it and just get all my protein naturally now. I think whole foods are better for long term health.