FAQ - Hypervitaminosis A
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Hypervitaminosis D?

I have bone pain and the dr. is testing me for Hypervitaminosis D. How long would I have had to have increased levels of Vitamin D to have bone pain associated with increased vitamin D?

You would have to take an overdose for many months at a time in order to have hypervitaminosis D.  (+ info)

Can I get vitamin A toxicity from vitamin pills?

So, I've started taking centrums to get my daily vitamins, but lately I think I've been getting a little too much beta-carotene. My pretty yellow-orange fingers can attest to it. So, anyway, I know beta-carotene can be flushed out by the kidneys since it's water soluble, but 70% of the vitamin A in the pill is not beta-carotene, which means it's probably retinol or some other variety of fat-soluble Vitamin A. The bottle lists 90% daily value per pill. I'm wondering if I might be getting too much fat soluble vitamin A and if I could get Hypervitaminosis A from taking the pills. I'd rather not have to stop taking them, so if someone could tell me if it's safe or not that would be great.

The only way you could have a problem is if you do not follow the directions on the label. You should never take more than what the label states. I would suggest talking to a doctor about the yellow-orange fingers.  (+ info)

Can hypervitaminosis D occur from prolonged sunlight exposure if the person has extremely light skin?

Keep in mind we are talking about past peoples who did not have sunscreen yet, nor knew about fortifying diets with vitamins and minerals. In a human variation class, I was told by the professor that people with light skin can develop hypervitaminosis D in equatorial climates from too much sunlight exposure, if they do not use sunscreen and are out in the light for long periods of time each day (for instance people in the past). Is this possible? I know that rickets can theoretically occur in very dark-skinned people in northern climates without fortified diets more easily that light-skinned people without fortified diets (light skin allows for vitamin D production from sunlight).

Does anyone know about this happening? Or potentially happening? Do you have any sources for more information on this subject? All I can find is hypervitaminosis D due to over-dosing on supplements over long periods of time.

I have Sarcoidosis, which caused my Hypervitaminosis-D. I have never read or heard of overexposure to the sun causing the ailment, but I suppose it might be possible. I know it can be caused by my disease as well as by lymphoma, tuberculosis, and misuse of prescription vitamins - but I don't know about sun exposure. The sun increases the physical symptoms - for instance, I am fine in my home protected from any exposure at all, but even as little as 5 minutes outside some days can be enough for me to become very ill. You may want to ck out the sites I've used to help me learn about and deal with the Hypervitaminosis-D. Even if your Hyper-D isn't caused by Sarc like mine is, something may help. You will also see that there are good people like Dr. Trevor Marshall that you can email, and one of them might have some answers for you. I've listed the sites under sources. My best wishes to you...  (+ info)

Am I going to face problems due to excess intake of vitamin A?

As vitamin A is good for skin I decided to take it everyday and took 3 capsules/day for 6 days. Now I am not sure whether it is going to cause any problem to me or not. Because I read that over dosage of vitamin A is not good for health and can cause Hypervitaminosis and also other problems. As the article in the link says the daily tolerable intake for 19+ years: 3000 µg or 10,000 IU. but the capsule contains Vitamin A IP (as palmitate) 25000IU equivalent to retinol 7.5 mg). And I have exceeded the limit for 6 days constantly. What am I supposed to do. Please help me.


Los signos y síntomas de toxicidad o hipervitaminosis (exceso de vitamina A) pueden ser:
Anorexia, pérdida de peso, vómitos y nausea, visión borrosa, irritabilidad, hepatomegalia, alopecia, jaquecas, insomnio, debilidad, poca fuerza muscular amenorrea (cese del periodo menstrual), hidrocefalia e hipertensión craneana en niños.

Un signo carente de peligrosidad es la hipercarotenosis. El consumo excesivo de verduras puede producirlo. El exceso de carotenos se deposita debajo de la piel dando un color amarillento en palma de las manos.
Los beta carotenos son considerados seguros generalmente ya que no están asociados con efectos adversos. Su conversión a vitamina A disminuye cuando los depósitos de ésta en el organismo son suficientes. Solo pueden producir hipercarotenosis, la cual no es considerada peligrosa para la salud. Cuando se disminuye esta ingesta excesiva, el color de la piel se normaliza.

Se han establecido niveles de ingesta máximas tolerables (tolerable upper intake levels: UL) para prevenir el riego de toxicidad con vitamina A. Los efectos adversos se incrementan a ingestas mayores al nivel máximo tolerable.
Estos niveles no son aplicables en personas que padecen de malnutrición y que reciben periódicamente vitamina A ni tampoco en individuos que son tratados con vitamina A para tratar diversas enfermedades como la retinitis pigmentosa


What is Recommended Dietary Allowance?

I'm looking at Wikipedia's pages on RDA, Vitamin, and Vitamin A. The RDA page says RDA is 3000 times AI for Vitamin A, and the upper limit is 10000 IU. On the other hand, Vitamin A page says that RDA is 900 AI for males 19-70 y.o. and that upper limit is 3000 micrograms just like the page on Vitamins in general, which is inconsistent with the RDA page. Which is correct?

Further down on the Vitamin A page, there are listed food sources of Vitamin A. It says that in 100 grams of liver there is 722% RDA (6500 micrograms) of Vitamin A, and according to a table above that, that's WAY above the Upper Limit. Now, 100 grams of liver is a very small amount of liver and when I eat liver I eat more like 200-300 grams which means that I'm taking up to 19500 micrograms of Vitamin A, not to mention I'm also having salads at the same meal, as well as other meals during the day. So, either I'm suffering a severe case of Hypervitaminosis A (actually Hypervitaminosis in general), or something's wrong there.

So, my question is what on Earth is this RDA table supposed to mean? If going above UL means toxicity and the vitamin levels in foods really are correct then I'm intoxicated with all listed vitamins! But perhaps I'm misunderstanding something here. Can someone please explain?

As a bonus question for those who want the best answer, explain and/or give reference which explains the IU unit (what is it).

Davion2308, I don't know how you can hope to have answered my question when you haven't addressed any of them whatsoever. Instead you invented the question of your own and answered that. NO, I'm not worried about my intake of Vitamin A, or any other vitamin for that matter. I don't know if that strikes you as odd, but I'd simply like to understand RDA.

First, wikipedia is a terrible resource that can be unfounded when it comes to specific information like USDA factoids. Instead, go to the USDA government website and take a look at what they have to say.

If you're really worried about not getting enough Vitamin A, take a daily supplement. That'll get you over the age. And if you're worried about toxicity with vitamins, worry no longer. Generally, the body will flush any and all extra vitamins out with your urine. It uses the max it needs and the rest is excreted. The only overdosage you can get is with iron. That one can do damage when you have a high volume in your system.

I hope I answered your question.  (+ info)

Do i take too much vitamin A?

Ok so i started taking vitamin A for it's beneficial effects on eyesight and skin. However i also take one men's multivitamin with 3500 iu per day, 2 kirkland fish oil concentrate capsules/day, and a 5000 iu vitamin A/day. The men's vitamin and vitamin A tablet have a total of 8500 iu/day which is under the recommended 10000 iu/day which i'm not worried about, however they say that fish oil concentrates can contain vitamin A especially when it is made from the liver of the fish. What i'm worried about is that it doesn't say how much vitamin A is in the fish oil capsule, which there may be none, but i'm wondering if anyone knows. The fish oil capsule ingredients are: fish oil concentrate, gelatin, glycerin, water, tocopherol and contains: fish (anchovy, sardine) and soy. I'm a guy by the way and my eyesight and skin isn't that great so thats why i take it, but i'm a bit worried that i could get hypervitaminosis a, especially since vitamin a is fat soluble if i do get it it would be hard to get down to healthy levels of vitamin a. I also heard that soy contains estrogen which isn't ideal for a guy to take. But my main question is do you think i'm taking too much vitamin A/day? the link for the kind of fish oil i'm taking: http://www.costco.com/Browse/Product.aspx?Prodid=11072245
Thank you!
oh and i take the vitamins because i'm in college now and my meals are not quite so balanced and wholesome anymore, i have to eat the college food they provide while its a bit cheaper (however still irrationally expensive!) but it still sucks. It's not very convenient for me to make my own food as i have to travel 2 stories down to use a public kitchenette that others most likely are in line to use.

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