2400 IU of Vitamin D is need to get most above 30 nanograms – Sept 2017

Dietary Vitamin D Intake for the Elderly Population: Update on the Recommended Dietary Allowance for Vitamin D

Endocrinology and Metabolism Clinics of North America, online 29 September 2017, https://doi.org/10.1016/j.ecl.2017.07.003
Lynette M. Smith, PhD a, , J. Christopher Gallagher, MD: jcg at creighton.edu

No free abstract
VitaminDWiki bought the study
The following is a subset of one of their tables

The table is their analysis of data from 2 randomized controlled trials in a 1,000 different ways

The RDA gets most individuals above a vitamin D level

• “RDA is the average daily dietary intake level estimated to meet the nutrient requirements of nearly all healthy persons in a life stage and gender, that is, it meets the needs of 97.5% of individuals”

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See also VitaminDWiki

• Much more than 2,000 IU of vitamin D is needed daily (Middle East studies agree) – meta-analysis Nov 2016
• Vitamin D needs in 2004:1000 IU, 10 years later same author says 3,500 IU Dr. Hollick
• Even taking as much as 4200 IU vitamin D 43 percent had less than 30 ng in blood – RCT Jan 2013
• Vitamin D Recommendations around the world - IU and ng
• Vitamin D supplementation guidelines (adults – 50,000 IU per week) – Feb 2017
• 50,000 IU of vitamin D every two weeks – Jordan conclusion - RCT July 2017
  Every two weeks = 3,600 IU daily
• 6,000 IU needed for many to achieve 40 ng of Vitamin D - Feb 2017
• Best Vitamin D- 40 to 52 ng, achieved with 4000 – 6000 IU daily – Heaney Oct 2014
• Is 50 ng of vitamin D too high, just right, or not enough
• All items in category How Much Vitamin D 345 items
• Review of vitamin D recommendations around the world – April 2017 has the following
  
  Red = severe deficiency, must be corrected
  Orange = mild deficiency, should be corrected
  Green = sufficient, no more is needed
  (Optimal is not shown)