Mr. William says drinking celery juice can lead to clearer skin and weight loss, and help eliminate migraines and gout. Of course, these claims are not backed up by science. But that has not prevented many celebrities from publicly endorsing the “Medical Medium,” including Sylvester Stallone, Pharrell Williams, Robert DeNiro, Novak Djokovic and Gwyneth Paltrow.

In New York City, juice is a hallowed symbol of status. Expensive juicers are the mark of a high-tech, high-end, “clean-eating” kitchen , and juice bars are a feature of some of the city’s more exclusive gyms. The Museum of Modern Art recently displayed Josh Kline’s “Skittles,” an installation of 15 smoothies intended to encapsulate different experiences of New York City (“condo,” “night life,” “Williamsburg”) with deliberately absurd ingredients like yoga mats and octopus ink.

In juices and otherwise, celery has never been so hot. “We’ve seen celery sales in produce triple in growth from the previous year,” Masud Alam, the Northeast Regional Produce Coordinator at Whole Foods Market, wrote in an email.

Michael Karsch, the C.E.O. of Juice Press, tracked the rise of celery juice on social media and on Google Trends and, less than a year ago, responded by offering 12 ounces of organic and cold-pressed celery juice for $7 . “Within a few days, it was our third best selling beverage, which is astonishing for a one-ingredient offering,” said Mr. Karsch, a reluctant convert. “I have been historically unimpressed by celery. It’s not vibrant. It’s got a ton of water and a ton of a fiber. But was in the store this morning and had a celery juice this morning. Something about it that made me feel like I was doing something good for myself.”

The problem was that he couldn’t keep up with demand. “Three months ago where we couldn’t provide enough celery juice for about 4 days,” he said. They’ve experienced similar shortages before.