<prompt> Richest source of Vitamin D is -MilkEggGreen leafy ve getablesFish oil  <response>: - vitamin D is unique because it is derived both from sunlight and foods. - vitamin D is necessary for the functions of bone, kidney and intestine. - the richest source of vitamin D is cod liver oil 200-750mcg per 100g and other fish oils. Reference : Parks textbook of preventive and social medicine, 23rd edition, pg no:617 p 