Vitamin D overdose?

vitamin d process imageI have been studying and applying nutrition for over 30 years now, and I have experimented with countless nutrients, to the point where I know their effects if I take too much. Based on the recommendations of Dr. Joseph Mercola and others of taking 5,000 IU of vitamin D per day, I recently OD’ed and had a miserable two weeks until the stuff finally left my body.

What happens to me when I take too much vitamin A or D is that I develop a “cold” during which time I have to blow my nose umpteen times a day, running through boxes of tissues, over a period of at least two weeks, depending on how long I’ve been taking the vitamin. Over the decades, I have done this experiment on a number of occasions with vitamin A, taking “only” the recommended daily allowance of about 5,000 IU.  The same thing happens over and over again – out come the tissues, with the red, raw nose and so on. The very same unpleasant experience occurred with vitamin D at the level of 5,000 IU per day.

I broach this subject because I am willing to bet that there are others out there who have the same experience but who aren’t recognizing the cause. I would hate to see anyone suffering from this awful syndrome but continuing to take those amounts of vits. A and D. I would be very surprised, in fact, if there aren’t many people currently experiencing problems with too much vitamin D, because of all the recent push for supplementation.

As  emphasized by Dr. Mercola  – for whom I have tremendous respect – the best source of vit. D is sunlight, and I personally can attest that supplementing can be tricky. The fact that Mercola discusses how sunlight can destroy “excessive” amounts of vitamin D in your bloodstream means that there can be excessive amounts, obviously.

Moreover, I am certain from experience that taking handfuls of supplements causes hyperacidity, another subject I may broach in the future.

As they say, everything in moderation.

How Much Vitamin D Do You Really Need to Take?


  1. Mankind cannot live without Vitamin….

    You got your Mojo back ?

    In this environment, Milk thistle ( helps liver break down toxins) is a MUST, as well as Hawthorn Berry ( Helps the heart with oxygen circulation ).

    I gave the herb Ginger to one of my relatives for indigestion and he said it cleared it up in 20 minutes. Must have unclogged his gallbladder.

    Too bad our culture doesn’t do more to teach people about herbs.

    L’chaim Tovah

    1. Use of herbs
      We’ve been listening to the weekly Podcast Skeptics Guide to the Universe. Dr. Steve Novella, a neurology specialist from Yale University runs the podcast along with family and friends. Together they talk about trends in medicine and science. According to Steve, the use of herbs does little more than drain your budget. Perhaps it was the placebo affect that kicked in during the 20 minute period and not the ginger. At any rate, check out the podcast for update scientific information. They share the news and have fun doing it-

      You can find them on Itunes! Enjoy!

  2. According to NIH, upper levels for RDA for D is 20
    The most likely cause of vitamin D overdose is from an excessive intake of supplements. The body does not have a mechanism to shutdown the absorption of large amounts of vitamin D from supplemental vitamin preparations. As such, it builds up to toxic levels, causing Hypervitaminosis D. Such incidents are most closely associated with prescription supplements of vitamin D.

    People most vulnerable to an overdose are often those who suffer from rickets or some other disease or condition that is caused by vitamin D deficiency. In this case, pharmacological doses are prescribed for therapeutic purposes.

    How Much is Too Much?
    Vitamin D overdose typically happens over a period of time rather than from a single large dose. This is because, unlike most other essential nutrients we consume, the body does not excrete excess vitamin D. Instead, it is stored in the body’s fat cells where it can accumulate to toxic levels over time.

    According to the National Institutes of Health, the Upper Intake Levels (ULs) for the vitamin D are as follows:

    Birth to 12 months of age: 25 micrograms (1,000 IU)
    One year of age or older: 50 micrograms (2,000 IU)
    Studies have also shown that, taken over long periods of time, consumption of vitamin D in amounts above the UL will result in toxicity. For children under the age of 12 months, a sustained intake of 1,000 micrograms (40,000 IU) a day will produce toxicity in just one to four months. For adults, 2,500 micrograms (100,000 IU) a day may result in toxicity in a few months.

  3. I have a little trouble keeping my vitamin A dosage low, because at present I’m on the skin medication Roaccutane (I think it’s just called Accutane in the US). It has worked wonders on my skin and it’s almost over, but the side-effects are very far reaching! For example, mood issues is one of the strong effects to the point that one can be in a fantastic mood and some little thing will just throw you off the handle and (often in my case) into tears. It also dries your skin out like crazy, etc, etc,.

    But in the end, the side effects are worth it! My skin was hell one year ago!

    I take Vit D + Calcium supplement every day, not only for my bones but it’s also been found that such a combination lessens the chance of getting cancer by 70% (something around that number).

  4. Look through

    By the way, they are not recommending that you take that much Vitamin A it supposedly interfere with vitamin D uptake or something. It’s better to take beta carotene (and other carotenes) instead of real Vitamin A.

    You also are supposed to watch your calcium and magnesium intake as well. They all work together.

    NIH is the last place I’d go for accurate information.

    Most vitamin D scientists feel that 2,000 IU should be the minimal. 10,000 IU should be UL. There is NO actual well designed study showing 10,000 IU a day is too much over extended period of time. After all, our skin can produce 10,000-20,000 IU just being outside in the sun during the summer at midday. Light skinned people needs 20-30 minutes to generate that amount. Dark skinned people need much longer to generate that amount of vitamin D from the sun. That’s why they’re having all kinds of health problems esp from northern states.

  5. Fascinating Vit. D info
    Thanks for that – I take a lot of vit D and have had episodes of cold like symptoms with associated reactions almost like allergies. I will have to perform an experiment on this…

    BTW – have you ever researched the history of “wheat” and it’s effects on people’s health? Wheat has a whole sorted history of genetic manipulation (sort of a Wheat Conspiracy) and is a source of many health issues. Dr. William Davis

    And thank you for your beautiful writings on on religion. I say beautiful because there’s nothing more beautiful than truth and freedom from the control of these mind virus.

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