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

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.

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 items

• All items in Pregnancy items

• All items in Breast Cancer and Vitamin D 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