To my understanding I don’t think it matters what the source of retinol is too much as it’s going to be taken up by the liver after it enters the blood stream. I don’t think fat free dairy products have much retinol but Grant has argued that the protein in dairy products bind to retinoic acid and claims this is why rats died in these VA deficient diets as they weren’t actually deficient.@Jabuger Do you think there is a difference in hepatic absorption through butter versus fat-free dairy products?
Also retinol in certain products may degrade to retinoic acid and or anhydroretinol (which is potently toxic) so I’d say the safest source of retinol if you think it is necessary would be eggs. I’d just like to say my knowledge is limited so I wouldn’t direct your questions at me (I’m a noob).