It appears that zinc and magnesium improves the immune system. The minerals have been in the news as some believe that immune boosting supplements can reduce the severity of Covid.
Zinc has made headlines in other areas.
In 1982, the United States government and Canada replaced the copper penny with a copper coated slab of zinc. When the copper coating gets damaged the zinc will leach out.
People can get mildly sick from zinc toxicity when swallowing pennies. Animals like dogs can get extremely sick. The penny is now a little bit toxic.
The little metal weights used to balance the tires on cars are also often made of zinc. They used to be made of lead; so I guess zinc weight is an improvement.
One often finds the weights by the road side.