Calcium, a mineral vital to the human body, Calcium is necessary for many bodily functions, such as muscle contraction, and proper heart function.

Iron is one of the most commonly available chemical elements which are used in the form of metal. When in the presence of oxygen and moisture, iron gets oxidized very easily. Therefore it is never available on the surface of earth. Iron is a metal whose properties can be changed by mixing it with the various other metals. Humans need iron as a daily dietary substance. There are a number of supplements available in market which provides the daily required dose of iron. But the best way to consume iron is by eating the food that is rich in iron. Fish, poultry, beans, lentils, leafy vegetables are some of food items that are a good source of iron. Although, research shows that it is easier to digest the iron found in meat and meat products than the vegetables.

Vitamin A is needed by the retina of the eye in the form of a specific metabolite(the light-absorbing molecule retinal). This molecule is absolutely necessary for both scotopic and color vision. It also palys an important role in the health or our skin, bone metabolism, immune function. It is also commercially produced and administered as esters such as retinyl acetate commonly called Vitamin A acetate. Its defeciency can cause blindness. Other problems include impaired immunity, hypokeratosis (white lumps at hair follicles), keratosis pilaris and squamous metaplasia of the epithelium lining the upper respiratory passages and urinary bladder to a keratinized epithelium.

Vitamin C or ascorbic acid, is also known as the antiscorbitic vitamin because it prevents the nutritional disease Scurvy. Its most active form is L-ascorbic acid and L-dehydroascorbic acid. Vitamin C is known for building up the body’s defenses against infection. However, there is more to this vitamin than just being an immunity-builder. It is essential to normal functioning of all cellular units including ribosomes and mitochondria. This is because it is a primary requirement in the formation and maintenance of the “binder” that holds cells as well as the cellular fluid inside. Furthermore, this water-soluble vitamin is necessary in the conversion of folic acid into its active form, folinic acid, necessary for the formation of red blood cells. It also speeds up wound and fracture healing, is involved in metabolism of some essential amino acids, plays a role in the production of steroid hormones for stress response and promotes the absorption of iron for the body to use. It is also an antioxidant vitamin that protects normal cells from the damage of oxidative free radicals.