2000 IU of vitamin D- doctors trained that it was too much, but it is often too little

Most doctors limit their vitamin D prescriptions to 2,000 IU
The doctors training (incorrectly) told them that any more than 2,000 IU could be toxic

At least one Randomize Controlled Trial had to stop the 2,000 IU leg
because 2000 IU was not providing the healthful outcome that the 4,000 IU leg provided.

See VitaminDWiki

• Myth for 50 years: 2000 IU of vitamin D is toxic - still taught as fact in 2010
  The fact was that 2,000 IU of vitamin D per KILOGRAM was toxic if cofactors not balanced
• Proof that Vitamin D Works 82 Health conditions treated/prevented with Vitamin D as of May 2018
  Most of the proofs used 2000+ IU of vitamin D
• Earlier list of proofs sorted by daily average dose
  35 of the proofs used 2,000 or more IU of vitamin D
• Vitamin D needs in 2004:1000 IU, 10 years later same author says 3,500 IU
• One pill every two weeks gives you all the vitamin D most adults need 3,600 IU daily average
• 400 iu of vitamin D is like 24 seconds of sun in a swimsuit in Los Angeles
• Is 50 ng of vitamin D too high, just right, or not enough
  very few people can achieve the 50ng level with 2,000 IU of vitamin D
• 1000 IU per kg Vitamin D for autoimmune diseases – Coimbra Aug 2013
  close to but < 2,000 IU/kg
• Overview Toxicity of vitamin D
  Have marked up the graph for 100 kg adult: 2,000 IU/kg would be toxic in about 2 weeks
  Note that 2,000 IU is lower than the bottom of the graph

• 17 reasons why are doctors reluctant to accept vitamin D
• Do not expect your doctor to know about vitamin D
• Why doctors are so reluctant to try new things like vitamin D
• 2000 IU of vitamin D- doctors trained that it was too much, but it is often too little
• Doctors: If you pick one vitamin, make it D (99 cent ebook) – Jan 2016
• Do not expect a doctor to recommend a pill which will eliminate his job (vitamin D)
• Doctors rarely (15 prcnt) talked about Vitamin D and with very little ambiguity (96 prcnt)– Aug 2016

Country Surveys

• Doctors have a lot to learn about Vitamin D (Polish doctors in this case) – July 2021
• Doctors not consistent on prescribing Vitamin D (Pakistan in this case) July 2018
• UK people and doctors still clueless about vitamin D – Survey Oct 2014
• UK survey of vitamin D knowledge of midwives - 2011
• Vitamin D survey of general practitioners in New Zealand – June 2013
• Dutch doctors still have a lot to learn about Vitamin D – survey Dec 2018

Controversies and Consensus

• Minimum National Vitamin D recommendations range from 200 to 4,000 IU – July 2021
• Controversies and consensus in Vitamin D – 3rd Conference Sept 2019
• Vitamin D supplementation guidelines (adults – 50,000 IU per week) – Feb 2017
• Seniors need at least 4,000 IU vitamin D, no test needed – Consensus Jan 2014