Shape Magazine recommends a max of 1,000 IU of vitamin D (wrong) - Dec 2014

 

How to Pick the Best Vitamin D Supplement

But getting too much vitamin D can also be harmful, says Cooperman. Your safest bet, he says, is to get your vitamin D levels tested before choosing a dose. Until you can, avoid taking more than 1,000 IU per day and beware of signs of vitamin D toxicity, like nausea and weakness.

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See also VitaminDwiki

• No vitamin D test needed before supplementing (typically) – April 2014
• 50,000 IU monthly safe to take without any vitamin D testing – RCT Dec 2013
• No longer debating vitamin D supplementation, now debating need for testing first – April 2013
• Oil-based Vitamin D3 has the worst bioavailability – April 2014
• Overview Obesity and Vitamin D
• Dieters lost 5 more pounds if achieved more than 32 ng of vitamin D – RCT March 2014
• Those low on vitamin D were 2.4X more likely to gain weight – June 2013
• Third study found that Infants needed 1600 IU of vitamin D – JAMA RCT May 2013 and adults need more than infants
• Overview Women and Vitamin D
• All items in category Fertility and Sperm 142 items
• All items in Pregnancy 922 items
• All items in Breast Cancer and Vitamin D 259 items
• Overview Toxicity of vitamin D has a chart which summarizes published toxicity studies

• Thus the following are safe:
  2 million IU daily for 1 week,
  200,000 IU daily for 1.5 weeks,
  150,000 IU daily for 2 weeks,
  85,000 IU daily for 4 weeks,
  50,000 IU daily for 5 weeks