I’ve tried my fair share of supplements and vitamins over the years, usually with the same result: a burst of good intentions, a few days of remembering to take them, then the inevitable slide as the bottles end up pushed to the back of the cupboard and forgetting to take them with me on one of my many trips. Most don’t make enough of a difference to notice, and I lose interest. Heights turned out to be different. Within a couple of weeks, I could feel the change — and that’s what’s kept using them every single day. The first thing I noticed was energy. Not the buzzy, short-lived kick you get from sugary drinks, Red Bull or Coffee (I can't stand it but I know people swear by it!),…