Spinach is rich in vitamin C, carotene, protein, and minerals such as iron, calcium and phosphorus. And pig liver is rich in vitamin A and trace elements iron, zinc, copper, phosphorus, is an indispensable raw material for blood production.
There are two types of iron that we come into contact with on a daily basis and are food-derived, heme iron from animal foods and non-heme iron from plant foods.
Heme iron from animal food is not affected by oxalic acid, phytic acid and phosphoric acid when it is absorbed by the body, so the absorption rate is higher than non-heme iron from plant food. So if you want to supplement your iron, choose more animal foods.