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Source: Harvard Women's Health Watch
Summary:
Vitamin D can be manufactured by the body when exposed to sunlight, and early humans were in the sun enough to manufacture 10,000 IU/day
People now get most of their vitamin D from dietary sources with the RDA for adults 20-50 set at 200 IU, 400 IU for people 50 to 70, and 600 for over 70s
Vitamin D is now seen as preventive of osteoporosis, along with calcium, and recent studies have shown the RDA may be insufficient
Conclusion:
As sunbathing is not recommended due to risk of skin cancer, it may be prudent for everyone to take 800 IU of Vitamin D along with the RDA of calcium
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