LIVER
Liver has great nutritional value. It acts as a blood filter to remove and process the nutrients the blood has absorbed from the intestines, and also to remove toxins. It is for this latter reason that it is best to eat liver from relatively young animals. Older animals livers will have built up quantities of undesirable chemicals, medicines, hormones, etc.
Polar bear liver contains such a high concentration of vitamin A that it is toxic.
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