Micronutrients

Vitamin A is composed of potassium, magnesium, sodium and iron. It helps your vision improve, which might not seem so important now but helps in age. The recommended intake is 900 grams for boys and 700 for girls. Some healthy food sources are carrot juice, sweet potatoes or spinach.
Vitamin B or Vitamin B12 as commonly referred to, is composed of potassium, magnesium, sodium and iron and cobalamin. If not taken it can cause fatigue, but if taken helps the nervous system and brain. The recommended intake is 2.4 micrograms for all teenagers. This vitamin can be found in clams, liver or tuna fish.
Vitamin C is probably one of the most recommended vitamins to take and is composed of the same potassium, magnesium, sodium and iron. It can cause scurvy if not taken. Some sources for this vitamin are fruits (oranges are

 high in vitamin C) or leafy vegetables. Some examples are bean sprouts, green peppers and basically many major plant sources.


Sources/ Links-
http://www.whatdoesvitamincdo.org/
http://thevitaminsource.net/what-does-vitamin-b12-do-for-the-body/
http://ods.od.nih.gov/factsheets/VitaminA-HealthProfessional/#h3
http://michaelmorales.info/tag/examples-of-micronutrients