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 a necessary mineral for humans, needed for example to help form red blood cells which transport oxygen around the body. Fortunately there are plenty of good sources available for both the omnivore and the vegetarian or vegan These include liver, meat, beans, nuts, dried fruit , also whole grains and many of dark green leafy vegetables, although some such as spinach also contain substances that prevent the absorption of iron as do caffeine based drinks such as tea and coffee. On the other hand the drinking of fluids containing vitamin C aids the body in its necessary task of absorbing iron.

Vitamin A is a vitamin is needed by the retina of our 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 mainating body health, such as skin health, bone metabolism and immune function. Vitamin A is also commercially produced and administered as esters such as retinyl acetate commonly called Vitamin A acetate. Its defeciency can cause blindness. Some other problems include impaired immunity, keratosis pilaris and squamous metaplasia of the epithelium lining the upper respiratory passages and urinary bladder to a keratinized epithelium.

Vitamin C- The essential nutrient L-ascorbic acid, or rather Vitamin C, is necessary for a wide plethora of metabolic reactions in almost all living beings. In humans, Vitamin C is vital in the collagen synthesis. While most beings are able to make it internally, apes and humans cannot. Interestingly enough, while widely promoted as the best dietary source of Vitamin C, Oranges are dwarfed by the Kakadu plum, which has sixty times the amount. Prominent are rose hips, blackcurrant, red peppers, parsley, the kiwifruit, broccoli, redcurrant, several berries including strawberries and raspberries, as well as more exotic fruits and vegetables like Camu Camu, acerola, seabuckthorn, Indian gooseberry, jujube, guava and baobab. Tomatoes, while very popular Vitamin C source in the US, are very low on the Vitamin C scale.