Vitamin A is an umbrella term for a group of fat-soluble substances concentrated in plant and animal foods. In animal foods, vitamin A is found in the form of retinol and retinyl esters.
When the Institute of Medicine announced last fall that it was changing the amount of vitamin D it recommends most adults get each day from 200 international units (IU) to 600 IU, some critics ...
The upper tolerable limit for adults is 10,000 IU for vitamin A. You get it from animal foods, fish, and dairy products. Also, beta-carotene (from orange and yellow veggies) gets converted to ...
We include products we think are useful for our readers. If you buy through links on this page, we may earn a small commission. Here’s our process. Vitamin D is essential for bone health, muscle ...
and I generally recommend 1000-2000 IU units a day if the level is less than 50nmol/L in most patients,” says Prof Grossman. “Multivitamin supplements are fine, but most of the other vitamins ...
Historically, 400 IU (10 ug) of vitamin D was recommended for better health because it closely approximated the amount of vitamin D in a teaspoonful of cod liver oil. However, 800 to 1,000 IU is ...