Nutritional profiles of liver:
Vitamin A, copper, & iron
Duck:
Per 100 grams
11, 984 mcg Vit A RAE
5.962 mg copper
30.53 mg iron
Chicken:
Per 100 grams
3,296 mcg Vit A RAE
0.492 mg copper
8.99 mg iron
Beef:
Per 100 grams
4, 968 mcg Vit A RAE
9.755 mg copper
4.9 mg iron
Pork:
Per 100 grams
6,502 mcg Vit A RAE
0.677 mg copper
23.3 mg iron