luke wilson said:Quick question. I got my batch of vitamin a (retinaol acetate) and looks like I got one on the higher end of the spectrum - 25000iu. Apparently you can take to much of this stuff (which is bad) and having to little (bad also) so need to strike a balance. However, now that I have the supplements and don't want to throw them away, if I were to take lets say 2 a week, spaced out... is that ok? or maybe I should do 1 a week?
_http://www.whfoods.com/genpage.php?tname=nutrient&dbid=106
Here are some numbers to provide you with a concrete example. When chronic vitamin A toxicity occurs, it typically involves many months of daily intake of vitamin A in retinoid form in amounts exceeding 14,000 IU (4,200 mcg RE) in children and 25,000 IU (7,500 mcg RE) in adults. Let's compare that amount to the largest amounts found in food. At 135 mcg RE of retinol per cup, cow's milk is the animal food on our WHFoods list that ranks highest in retinol content. As you can see, an adult would have to consume over 55 times this amount every day over a period of several months in order to reach the toxicity level described above.
While vitamin A toxicity can be a problem for our health, it comes from improper use of retinoid-containing supplements, not from our diet. Most causes of vitamin A toxicity are due to accidental ingestion of supplemental doses exceeding 660,000 IU (200,000 mcg retinol equivalents) and 330,000 IU (100,000 mcg retinol equivalents) by adults and children, respectively.
I think 1 a week would be more than safe but the supplements would literally last years...
You can't overdose on dietary vitamin A because it is coming mainly from the precursor beta carotene which is converted only as necessary. Why risk overdose on synthetics when something is so readily available in a safer form? Obvious choices are things like carrots, red peppers and sweet potatoes but if intolerances/keto adaptation don't permit them then liver is a good source.
edit - remembered the form found in liver is not the precursor and can be overdosed, so might not be SO easy as I first thought