RDA stands for recommended daily allowance of vitamin D. usually we need labels to know that but these can be misleading also. Vitamin D is the most important substance in that regard and also has most misleading RDA also.

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What exactly is the Daily Value?

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The daily value is the recommended intake for a particular nutrient and generally calculated on the basis of 2000 calorie diet. For vitamins and minerals the daily need is based on the standard of recommended daily allowance or RDA. RDA vitamin D means the daily amount of vitamin D that should be taken to avoid deficiency.

Are Daily Values Important?

The one thing is proved that they are derived in a confusing way. However if some one eats well whole nutrients based food like meat, fish, fruit, vegetables. RDA vitamin D is less important for that person. These values are a lot more useful who are using supplements.

Why Daily Values are a Flawed Standard?

The primary out coming of daily values is that they are based on RDA's often these RDA's are not more than the level that we need to avoid deficiency. So this is misleading as this will be much less than the regular need of our body's optimal performance.

The Misleading RDA for Vitamin D

Robert Heaney MD is a researcher who served as a member of food and nutrition board for a decade to built RDA for vitamin D. according to him it is built to avoid the rickets in the body. This is misleading as the vitamin D deficiency can cause several other problems before getting extreme enough to cause rickets. And the level is same till today 200 IU for all people till 50 years although it is increased to 400 IU for people between 50 to 70 and 600 IU for people more than 70. But these values are still very low. According to the studies it is found that today human is far beyond the shining health. In fact the most of scientist believe that 80% of people in world are suffering from vitamin D deficiency.

In contrast to this 200 IU RDA vitamin D, new researches have shown that people who don't get enough sun exposure would also benefit from any dose between 1000 IU to 5000 IU daily. In some cases where vitamin D deficiency is present much higher dose are also used. It can sound like an extreme amount but in reality 1000 IU means 0.025 milligram of vitamin D.

What Is RDA for Vitamin D?

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