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At least 5,000 IU Vitamin D to get to optimal 50 ng - LEF Nov 2013

When trying to purchase another Vitamin D test at Life Extension Foundation I got the following pleasant message

Life Extension’s research has found that if a person is not taking at least 5000IU of vitamin D a day they will likely be below an optimal blood value of 50ng/mL.
Life Extension suggests most people take this amount for at least 1 month before doing their vitamin D blood test.
Please see our January 2010 magazine article "Startling Findings About Vitamin D Levels in Life Extension Members" for more details.

See also VitaminDWiki


How much to supplement Grassroots Jan 2013

Most people in this study needed > 4800 IU to get to 50 ng X 2.5 = 125 nmol

see wikipage: http://www.vitamindwiki.com/tiki-index.php?page_id=2681

A few of the variables as to how much vitamin D is needed

IU of vitamin D to add vs X

USANA agreed with LEF a few years ago (last chart)

Dose response chart Winter 2010: see wiki page for details and link:http://www.vitamindwiki.com/tiki-index.php?page_id=1197

Be sure to adjust cofactors when having an optimum level of vitamin D

At a minimum: Reduce Calcium to 500 and increase Magnesum to 500
see wikipagehttp://www.vitamindwiki.com/tiki-index.php?page_id=1936