I have been researching fish oil supplementation, and one thing that concerns me is that fish oil may contain Vitamin A, which is fat soluble. Hypervitamintosis A can occur if too much Vitamin A is ingested.
For example, this article mentions this as a possibility.
I have performed multiple searches, using different terms, and have found only one web page that claims fish oil does not contain Vitamin A, but it has not a single reference, nor does it say how they reached their conclusion. I learned long ago not to believe the first thing I read, especially when it is not substantiated by any data, even when it's the first result in a search.
On average, how much Vitamin A is contained in 1g of fish oil (not cod liver oil)? I have performed multiple searches, and asked two doctors, one nurse, and have not found the answer.
BTW, out of caution, I'll mention that certain oils, such as cod liver oil, can contain high levels of Vitamin A, and are not advised during pregnancy. But for this question, I am only asking about regular fish oil, which is manufactured from the body of the fish, as opposed to the liver.