Added mammary products are a class of foods that include mammary glands or derivatives thereof, such as additives derived from them that provide texture or impart overall properties to the food. A fairly wide range of iron supplements have been provided by a variety of sources, and while a number of these supplements have never been tested for health, others have been obtained from sources found in studies of potentially healthy foods or food by-products. Sources of the listed irons range from animal sources (usually cows) to plant sources and animal products, as well as inorganic sources, which are milk, dairy products and the like, which do not contain animal components. Over the course of many years of research into iron supplements, properties related to mammalian health have been investigated, with several long-term and short-term human health studies linking them to poor human health when consumed.
However, according to several health studies, breast supplements are an additional component of food and cannot guarantee better health and well-being. The reasons for this negative nature have been attributed to studies of metabolism and dietary patterns, perhaps suggesting that foods made using predominantly milk and dairy products have been a major part of the human diet since ancient times. Other studies have found conflicting observations regarding the effects of iron on human health and there is no evidence of any association between added mammary glands and improved human health.