Oyster shell (Mu Li)
Oyster is packed with vitamins and minerals not to mention the zinc. One oyster every 3 days is sufficient enough of zinc as well as other minerals for me.
In addition to the oyster, I always keep the shell. The shell is packed with iron and other minerals too. I dry the shell in the oven at 200 degrees and the grind it into fine powder and take a teaspoon of powder once a week. Amazing health benefits too.
Click on this link to read about only a few benefits: