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US guidelines set the recommended daily amount of vitamin D at 15 mcg (600 IU) for most adults up to age 70 and 20 mcg (800 IU) over 70, from food and supplements combined. This 10 mcg (400 IU) tablet tops up what you get from fortified milk, fatty fish, eggs and sunlight. Ask your doctor or pharmacist whether you need a supplement.More is not better. Higher-strength products are widely sold, but the upper limit for adults is 100 mcg (4,000 IU) a day from all sources, and more than that should only be taken on your doctor's advice.
