Vitamin A
Vitamin A…
Why do we need it?
What is it?
Vitamin A (retinol,
retinoic acid) is a nutrient important to vision, growth, cell division,
reproduction and immunity. Vitamin A is a
fat-soluble nutrient that plays a vital role in your body.
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How much do we need each day?
900
micrograms (mcg) for adult men700
mcg for adult womenToo
much vitamin A can be harmful. Even a single large dose — over 200,000 mcg —
can cause:NauseaVomitingVertigoBlurry
vision
If
you are or might become pregnant, talk to your doctor before taking vitamin A.
Excess use of vitamin A during pregnancy has been linked to birth defects.
What does it do?
Vitamin
A has antioxidant properties. Antioxidants are substances that might protect
your cells against the effects of free radicals — molecules produced when your
body breaks down food or is exposed to tobacco smoke and radiation. Free
radicals might play a role in heart disease, cancer and other diseases.Age-related macular degeneration. A large
clinical trial showed that people at high risk of advanced age-related macular
degeneration reduced their risk of developing the condition by 25 percent by
taking a specific combination of vitamins that included beta-carotene. It’s not
entirely clear what role beta-carotene playedAs
an oral supplement, vitamin A mainly benefits people who have a poor or limited
diet or who have a condition that increases the need for vitamin A, such as
pancreatic disease, eye disease or measles.It
supports immune function by supporting the growth and distribution of T-cells,
a type of white blood cell that protects your body from infectionVitamin
A helps with multiple aspects of the human reproductive system. Getting enough
of the vitamin in your diet helps prevent birth defects and reduces the risk of
infertility for all gendersYour
immune system is a complex collection of different cells that keep you healthy.
Vitamin A plays a critical role in helping these cells communicate and regulate
themselves effectively.
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Food Sources
Vitamin
A is found in many foods, such as spinach, dairy products and liver. Other
sources are foods rich in beta-carotene, such as green leafy vegetables,
carrots and cantaloupe. Your body converts beta-carotene into vitamin A.Preformed vitamin A — retinol and retinyl esters — occurs
exclusively in animal products, such as dairy, liver and fish, whileProvitamin
A carotenoids are abundant in plant foods like fruits, vegetables and oils
What if I have a shortage?
Early signs:
Vitamin A deficiency causes
anemia and dry eyes.
The most common symptom of vitamin A deficiency
in young children and pregnant women is an eye condition called
xerophthalmia. Xerophthalmia is the inability to see in low light, and it
can lead to blindness if it isn’t treated.
Data Sources
MAYO ClinicHealthline.comWebMD.comNationsl Institutes of Health
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