Response to high dose vitamin D is limited by vitamin A

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 items

• All items in category Vitamin A items

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