Amount of Vitamin D in Onions, raw natural

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There is IU amount of Vitamin D in amount of Onions, raw natural

VITAMIN D
Vitamin D is different to other nutrients as our body is able to make it with the help of the sunshine.

Technically speaking if we would spend enough time in the sun, we would not require vitamin D from food, however there are factors that limit sun exposure, whether it is time of the year, time of the day, cloths we ware, too much indoors activities, applying sunscreens and even pollution can interfere with the synthesis of vitamin D and food source is important.

The two most important forms of vitamin D are animal sourced D3 called cholecalciferol (most common in supplements) and plant sourced D2 called ergocalciferol. The most significant role of vitamin D is in the bone growth, as it helps with absorbency of calcium. It is also important in immune system function, nervous system, muscles and skin. Recently it has been shown to be beneficial in the treatment of autoimmune diseases, such as multiple sclerosis and fibromyalgia. Deficiency of vitamin D are closely linked to rickets, osteoporosis, osteomalacia and in elderly it leads to bone fractures. The most significant sources of vitamin D beside sunshine are fortified butter and milk, fish liver oils, eggs, sprouted seeds, beef.

Determine, under different quantities, how much of Vitamin D nutrient can be found in Onions, raw natural. Calculate and convert the amounts.