On last night’s premiere of Real Housewives of Beverly Hills, Lisa Rinna traded her infamous “bag of pills” for an IV of vitamins instead. Rinna and her daughters, Delilah and Amelia, chat about the fact that they’re getting sick, and Rinna says she has a vitamin drip coming for the three of them. Delilah excitedly sighs that she loves vitamin drips, because “you feel so good after.” Rinna agrees: “Aren’t they great? Because we need it. We’re busy.” Sure enough, Ehsan Ali, MD, a primary care physician and “concierge doctor” in Beverly Hills, makes a house call to administer IVs in bed. “This will make me not sick anymore, right?” Delilah asks. “It’s, like, water with all the different minerals, vitamin B12 and vitamin C,” Dr. Ali says. Then he explains it’s going to help her feel better because “we’re hydrating you.” So, what exactly is a vitamin drip?