i wonder how many servings of liver i could safely consume per week. This article suggests that toxicity studies on Vit A were done using synthetic forms and not those naturally occurring in food; but still suggest only two servings a week. i currently eat at least 1/2 lb beef liver and 1 lb of chicken liver a week and occassionally some pork liver.
what symptoms would i have if it were too much? could i off-set the storage of Vit A with another food?
I would wager that the retinol in supplements is largely equivalent to the retinol in liver. However, testing toxicity thresholds in populations who are deficient in several minerals as well as the other fat soluble vitamins is going to be less applicable to us than presented.
The amount that you're eating is not out of the realm of possibility for a HG or pleistocene human.
What you pretty much can't overdose on is beta-carotene, since we're so inefficient at converting to retinol (though you can turn orange).