Month: October 2025

Most adults need 600–800 International Units (IU), or 15–20 micrograms (mcg), of vitamin D per day to support bone and immune health. The exact amount depends on your age, overall health, and how much sunlight you get. The safe upper limit for adults is 4,000 IU (100 mcg) per day—going above this may cause harm and should only be done on a doctor’s advice. Make sure to talk with your …