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NotThamesWater
hippy
"Unfortunately there is no agreed consensus on the daily requirements for vitamin the intake in adults and intake recommendations can be from 800 to 2000 IU/day. The UK Department of Health recommends maximum daily intake of VitD is 0.025 mg per day which is 1000IU per day although a higher intake may be recommended under supervision of a specialist for a short period of time. Recent research indicates that without the necessary sunshine exposure athletes required between 600 and 1000 IU per day."