Vitamin D is a fat soluble vitamin. It is required for bone health, muscle function, immunity regulation, cardiovascular function and has anti-inflammatory properties. It is available in fatty fish (salmon, sardines, mackerel), cod liver oil (excellent), egg yolk (modest), fortified foods (milk, cereals), cheese (mild) and sunlight. Deficiency is common in population especially urban areas and malnourished areas. It's deficiency leads to poor absorption of calcium from gut with poor mineralisation of bones resulting in weaker bones. Other symptoms include muscle fatigue, weakness, poor immunity, chronic pain especially back pain and loss of hair.