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The first time I heard mention of NAD (pronounced “nad” not “N-A-D” by its evangelists) it was from the mouth of Joe Rogan. Ergo, I eye-rolled and moved on with my life. But then it started popping up in my social feeds. It was being used as a verb (excuse me, you’re what-ing?) on podcasts that I actually like, and it was being name-dropped (or, ahem, NAD-dropped) by humans whose opinions I value. At a skin care event in New York, makeup artist and newly minted, sleep-deprived mom of two Jessi Butterfield shared that she had started taking it after hearing whispers of its brain fog-lifting abilities from some of her male grooming clients who used it for performance. “I feel like the NAD has helped me regain a little more mental clarity and my overall energy level has definitely improved compared to after my first kid,” she told me. My interest was piqued.