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When retinyl palimitate is taken orally, how much is absorbed? I've read that it is anywhere from 10-50%, and that's quite a large range.
A 100k IU dose of retinyl palmitate is equivalent to how many IU of retinol being used by the body?
I believe it would be 55,000 iu retinol in 100,000 iu retinyl palmitate. If you buy the powder, you'll have to further convert mg to iu. I have personally tried this with another brand of supposedly USP retinyl palmitate, that apparently wasn't what it claimed to be, since I couldn't get it to dissolve in oil. It should dissolve in oil or alcohol, I think.
After trying, I think it is more trouble than it is worth. I just bought a bottle of health natura, 15,000 iu per drop, 1430 drops per bottle. Should last a while, and I feel better about the quality, but haven't been taking it long enough to comment on effectiveness. Good luck if you want to try.