crabsallover highlights in red, comments in blue.
Ray Kurzweil & Terry Grossman in Transcend (2009), chapter 12 pg 327.
Lab Test Vitamin D - 25 hydroxy vitamin D 25(OH)D - normal reference range for lab they use is 32-100 ng/dL
25(OH)D K & G recommend 50ng/dl. Daily multiple is 400 International Units (IU). If < 20 25(OH)D take 5000IU/day, if 21-30 take 2000 IU/day, if 31-40 take 1000IU/day. Get lab test done after 3 months then use 1000-2000IU/day to maintain levels with lab tests ongoing to prevent excess levels.
Try to expose skin to <30mins per day direct sun before 10am or after 4pm.
Note: According to UK Consensus statement (December 2010):- Levels of Vitamin D below 25nmol/L (10ng/ml) (or 1000ng/dl) are “deficient”. People at risk of low sun exposure should take a 10 microgram supplement of vitamin D a day which is the Government recommended dose. NB. Boots General A-Z has 5 microgram Vitamin D per capsule per day (100% RDA).