Kendall Jenner & Hailey Bieber Take NAD+ to Prevent Aging—But What Is This Supplement?

People often comment that the Kardashians are aging in reverse. While we may never know all their beauty secrets—especially in terms of the full extent of exactly what they do every day to stay healthy and prevent aging—we got a glimpse into their supplement routine on an episode of Hulu's The Kardashians.

During season 1, episode 5, Kendall Jenner and Hailey Bieber cited that they often get IV treatments that include NAD+, a compound that has been shown to reduce the physical effects of aging. Although Kendall and Hailey take NAD+ intravenously, you can also get NAD+ from foods like sardines, salmon, whole cow's milk, yeast, and crimini mushrooms. In fact, the molecule itself is so large that it cannot enter cells directly.