Is it OK to take 4000 IU of vitamin Da day?
Christopher Ramos
Updated on April 17, 2026
All things considered, a daily vitamin D intake of 1,000–4,000 IU, or 25–100 micrograms, should be enough to ensure optimal blood levels in most people. According to the National Institutes of Health, the safe upper limit is 4,000 IU.
Is 4000 IU of vitamin too much?
Generally, it's not recommended to exceed the upper limit of safe intake, which is 4,000 IU (100 mcg) per day. Larger doses have not been linked with any additional health benefits, and may therefore be completely unnecessary.Can I take 4000 IU vitamin D daily?
Unless your doctor recommends it, avoid taking more than 4,000 IU per day, which is considered the safe upper limit.Is 5000 IU of vitamin Da day too much?
The truth is, we do need vitamin D to stay healthy, but 5000 IU (units) of vitamin D in a daily tablet is more than most people need. The recommended maximum daily limit of vitamin D in healthy people is 4000 IU. That includes intakes from food, beverages, and supplements.What happens if you take 4000 units of vitamin D?
Safety and side effectsChildren age 9 years and older, adults, and pregnant and breastfeeding women who take more than 4,000 IU a day of vitamin D might experience: Nausea and vomiting. Poor appetite and weight loss. Constipation.