Myeongdong Main (43 Myeongdong-gil) and Myeongdong Station (134-1 Toegye-ro)

both carry these, 10am–10pm, close to Line 4 Myeongdong Station. Vitamin C is nearby too: Daewoong Vitamin C is 30 tablets for ₩5,000 with 23,698 orders, and Dongkook Liposome Vitamin C is ₩5,000 with 10,081 orders.