The USADA should ban vitamin D

Should USADA ban vitamin D and zinc? Martial Arts website

USADA = US Anti-Doping Agency

Vitamin D and Zinc give too much performance enhancement

No detail, just a discussion forum

• “Both of these have been shown scientifically to promote elevated testosterone levels. So do you think USADA should check for abnormally high vitamin D and Zinc levels? It's possible those testing positive for high T are really just taking a lot of Vitamin D and Zinc.”

  Search Google for usada "vitamin d" 48,000 items as of July 2017

• One athlete was taking 83X the minimum recommended dose

  • 83 X 600 = 50,000 IU
  • 50,000 IU daily is OK for a few weeks without cofactor adjustment
  • 50,000 IU daily is OK for many months if adjust cofactors

See also VitaminDWiki

• Overview Sports and vitamin D

• Athletic performance and recovery benefits of Vitamin D (4000-5000 IU and Vitamin K) – Aug 2015

• 5,000 IU vitamin D helped UK professional athletes in the winter – Oct 2012

• Vitamin D supplementation improves muscle strength in healthy adults – meta-analysis of 6 RCT Aug 2014

• Elite Athletes do well with weekly 35,000 IU of Vitamin D – RCT Feb 2017

• Fast twitch muscles increased by Vitamin D in athletes and seniors (reduce falling) – Oct 2016

• NHL discovers Vitamin D – their ideal is 40-120 ng – 2016

• Recent increase in Vitamin D levels in Elite Irish Athletes – Aug 2016

• Vitamin D increased muscle strength by 1% to 19% (varied with dose and duration) – review June 2016

• Most Olympic-class Dutch athletes nudged Vitamin D levels above 30 nanograms with 2200 IU daily – RCT July 2016

• Fastest US High School sprinters are both at the school taking lots of vitamin D (Matthews) May 2016

• Increased Testosterone and Erectile function, decreased weight with Vitamin D – March 2017

• Testosterone 14% higher in those with high vitamin D – Aug 2016

• Olympic Athletes and vitamin D - clippings 2009-10

  • Vitamin D/UV has been used in the Olympics since late 1930's

• Elite Athletes Try a New Training Tactic: More Vitamin D - WSJ Jan 2016

• The Importance of Vitamin D for Athletes - 2015

  • Nice charts