Taking Vitamin C has become fashionable in Nanjing, capital of Jiangsu Province, where citizens consume 30 million yuan (US$3.62 million) worth of the vitamin every year. The supplement is appealing to those who feel they cannot easily have a balanced diet. However, too much consumption can cause harm. Experts recommend taking one 100mg vitamin per day for adults, but many pills contain 10 times that amount, said a pharmacist affiliated with a Nanjing hospital.