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All, After bashing on the Huffington Post for their poor coverage of yesterday's fish oil protects against Alzheimer's disease study, I want to be fair. Today they've got a pretty thorough and well-researched article on vitamin D. They advocate three things I can agree with: The best way to get vitamin D is via modest sun exposure and supplements if necessary depending on your latitude/climate/lifestyle The serum vitamin D level to target is 30-50 ng/ml (75-125 nmol/L) You don't want to be too high or too low. The best way to determine how much to supplement is to get a blood test, and then titrate your supplement level to get into the 30-50 ngl/ml range by starting with these dosages: 100 IU (2.5 mcg) per day increases vitamin D blood levels 1 ng/ml (2.5 nmol/L). 500 IU (12.5 mcg) per day increases vitamin D blood levels 5 ng/ml (12.5 nmol/L). 1000 IU (25 mcg) per day increases vitamin D blood levels 10 ng/ml (25 nmol/L). 2000 IU (50 mcg) per day increases vitamin D blood levels 20 ng/ml (50 nmol/L). Thoughts on the article, and the wisdom of the approach to vitamin D it advocates? --Dean