So the lesson here is, don’t try to make “bulletproof” coffee with cold/iced coffee. First 2 attempts (1 with a regular blender, and 1 with a hand blender) failed with my cold brew. Use hot coffee. As to its efficacy… I can’t tell if it’s real, placebo, or the result of downing a cup of coffee, but I do feel a little more alert and wired. I don’t necessarily crash too hard going about my day-to-day and drinking regular coffee, so I can’t comment on that. Jury’s still out… will continue testing.