*15.7.2 Function*

Iron is helpful for the treatment of anemia; it may reduce fatigue and improves muscle endurance. It has an important role in strengthening the immunity system. Iron improves cognitive function [152] and reduces bruising.

### **15.8 Selenium**

Selenium is an important macromineral and essential for the human body. Selenium deficiency is common in a certain part of the world as it can be affected by pH.

### *15.8.1 Sources*

The sources of selenium are Brazil nuts, fish, ham, enriched foods, pork, beef, turkey, chicken, cottage cheese, eggs, brown rice, sunflower seeds, baked beans, mushrooms, oatmeal, spinach, milk and yogurt, lentils, cashews, and bananas.

### *15.8.2 Function*

Selenium has several health benefits, such as acts as a powerful antioxidant, may reduce the risk of certain cancers-lung [153], prostate [154], liver, colon [155], esophageal, and gastric [156]. It may protect against heart disease and prevents

mental decline. Selenium is important for maintaining thyroid health, helping to boost the immune system, and reducing asthma symptoms.

## **15.9 Zinc**

Zinc is a vital and second-most-abundant and essential mineral for the human body.

### *15.9.1 Sources*

The best sources of zinc are meat, shellfish, legumes, hemp seeds, nuts, dairy, eggs, whole grains, some vegetables, and dark chocolate.
