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Originally Posted by honeybeedreams
you are correct. Palmitate is the natural form, retinol is the supplimental form of A. both are fat soluable and build up in the fatty tissues of the body however. (both do need some conversion in the body to become usable by humans) beta carotene is from plants and is converted in the liver in to vitamin A and is water soluable and so does not build up in the body, we secrete what we don't need. people with thyriod and liver disease are not able to convert beta carotene very well and should be wary of vegetarian diets. (since it's been 5 years since i works with supplements i forgot that plamitate and retinol are different, people did always want to know which was which and i had to memorize all the different chemical names for all the different natural and synthetic forms of all the vitamins!  )
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Nope...retinol (retinal and retinoic acid) is the scientific name for natural vitamin A found in animal foods such as organ meats and properly grass fed dairy and pastured chicken eggs.
Retinyl Palmitate is synthetic and should be avoided as a supplement. Ditto Retinyl Acetate. These are the chief supplements used in research studies and again, they are synthetic.
Retinoids are synthetic, aka Accutane and cis-retinoic acid the Retin-A skin cream. Shown in studies to be seriously toxic during pregnancy.
Beta carotene is converted to vitamin A in the intestines (not the liver, it is stored in the liver)...it is converted by intestinal bacteria. Meaning there are many more conditions where people do not optimally convert it to Vitamin A: long term diarrhea, malabsorption issues, children, etc. The recent report now is a 12:1 ratio, meaning 12 units of beta carotene must be eaten to produce 1 unit of vitamin A, assuming optimal conversion.
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People eating a vegan diet are at a significant risk of vitamin A deficiency. It would take six cups of raw carrots or 20 cups of broccoli to obtain the recommended daily requirement of vitamin A per day. Simple Facts About Vitamin A
By Randall Neustaedter OMD, LAc, CCH http://www.hpakids.org/holistic-heal...bout-Vitamin-A |
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Originally Posted by honeybeedreams
one of my sources is from a paid database.. which means i can't give you a link, becuase you need to have paid to have access, but if you want to see it you can PM me. otherwise, you can do a google search for vitamin A and pregnancy and then google will show you the scholarly articles on it (as opposed to ads) and then you can judge for yourself what looks "conservative" or "poorly designed."
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Can you quote the study name and references to me please. I don't need a link, I can find on my own.
I have researched this extensively when I decided to supplement myself and DS with high vitamin cod liver oil. I looked at original research. I have never seen a toxicity study for the natural form of vitamin A.
All the studies that I have read that has shown toxicity/tetrogenicity have been the synthetic version of vitamin A.
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Originally Posted by honeybeedreams
(PS i'm not sure how CLO effects length of labor... my grandma took it everyday of her life and labored with my father for 4 days until the doctor came and yanked him out with forceps! what's scoop on CLO effecting labor length?)
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I do not know what this one particular cause could have been. Studies in animals have shown that vitamin A deficiency causes long labors and inability to push babies out.
CLO as a necessary supplement was common many years ago. My own parents ate (forced to eat as children!) liver and took CLO in orange juice every morning as a matter of course, everyone did b/c that was the prescription to be healthy. It was the Flintstones vitamins of its day.
Weston Price's research on native diets showed as a whole the common amount to ingest from foods was approx. 50,000 IU/day. Of course matched with vitamin D, which modern research has confirmed: vitamin D protects against vitamin A toxicity. Which leads us back to cod liver oil, good source of A and D.
(and by the way, A toxicity is reported at upwards of 100,000 IU/day for several weeks, pretty hard to get from foods.)
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