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Story summary
- The United Kingdom (U.K.) recommends adults and children over four take 10 micrograms (400 IU) of vitamin D daily from October through March due to limited sunlight.
- Vitamin D is crucial for bone, muscle, and immune function, and aging reduces skin production from sunlight.
- Oily fish and fortified cereals provide some vitamin D, but diet alone often falls short.
- Over-supplementation can be harmful, so seek medical guidance for higher doses.
