Amino acids are the basic building blocks of proteins and enzymes and are essential for normal healthy bodily function especially during growth and convalescence. The essential amino acids cannot be made in the body and must be included in the diet or as a supplement.

Vitamins B1, B2, B6 and nicotinamide form parts of co-enzyme systems concerned with release of energy from foodstuffs. Like the essential amino acids and minerals, they cannot be made in the body and must be included in the diet in small quantities. The B-complex vitamins are water-soluble and are not stored in the body in appreciable amounts. Consequently, regular replenishment of these vitamins is required. Their presence prevents the development of certain deficiency diseases such as beriberi, riboflavinosis and pellagra.

Iron is essential for haemoglobin formation and is needed to prevent iron-deficiency anemia. Vitamin B12 is the extrinsic factor, which together with the intrinsic factor found in gastric mucosa will prevent pernicious anemia. Liver extract contains variable amounts of Vitamin B12, folic acid and other blood-building factors.

Manganese, copper and iron are components of important enzyme systems essential for normal body functioning.