Nutrition supplements are products that are taken to supplement the diet and provide essential nutrients. IRON is an essential mineral that helps to transport oxygen throughout the body and is found in many foods such as red meat, poultry, fish, and legumes. Brewer's yeast is a type of yeast that is used in the production of beer and is also a source of B vitamins, minerals, and protein. It can be taken as a nutritional supplement to help with digestion and to provide additional nutrients.