I work in a high demand, long hour job that requires acute mental focus. You guessed it, anesthesia. This is my drink of choice, no sugar, I’m no wired, but I’m focused and can do anything. 200 mg of caffeine is perfect, and I’m not guzzling bitter coffee all day to add up to it. I’m also someone who enjoys the taste of citrus and NOS nails it. I love the regular, but the zero is good too so I can keep my sugar intake down.