Response to high dose vitamin D is limited by vitamin A - July 2013

Vitamin D response to > 20,000 IU/day
is limited when vitamin A > 5,000 IU

Survey response by 3,355 people to Grassroots Health

• 34% of participants report taking vitamin A as retinol or retinyl palmitate in supplements.
• Of those who take vitamin A, the average amount is 5,400 IU per day.
• Participants who take greater than 5,000 IU of vitamin A per day have a lower vitamin D dose response than participants who take 5,000 IU or less per day,
  but the difference is not statistically significant.

PDF is attached at the bottom of this page

See also VitaminDWiki

• 7 X more likely to get hip fracture if have highest level of vitamin A – Jan 2003
• 8X higher Osteoporosis risk if high level of vitamin A, vitamin D important too – Feb 2013
• Vitamin A (Cod Liver Oil) blocks vitamin D – 2008
• Vitamin D protects against lung cancer unless there is excess vitamin A – July 2012
• Vitamin D needs some vitamin A, but not too much
• Vitamin A and dioxin-like compounds in fish liver, etc may block vitamin D – July 2012
• Vitamin A Misc 200,000 IU of vitamin A twice a year is too much
• Vitamin A may thwart the ability of vitamin D to reduce risk of osteoporosis – June 2010
• All items in category Predict Vitamin D 82 items
• All items in category Vitamin A 99 items

Short url =http://is.gd/vitdvita