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Common Forms: alpha-tocopherol, beta-tocopherol, D-alpha-tocopherol,
delta-tocopherol, gamma-tocopherol
Vitamin E is a fat-soluble vitamin present in many foods, especially certain
fats and oils. It is one of a number of nutrients called antioxidants. Some
other well known antioxidants include vitamin C and beta-carotene. Antioxidants
are nutrients that block some of the damage caused by toxic by-products released
when the body transforms food into energy or fights off infection. The build up
of these by-products over time is largely responsible for the aging process and
can contribute to the development of various health conditions such as heart
disease, cancer, and a host of inflammatory conditions like arthritis.
Antioxidants provide some protection against these conditions and also help
reduce the damage to the body caused by toxic chemicals and pollutants.
Vitamin E deficiency can be seen in people unable to absorb fat properly.
Such conditions include pancreatitis (inflammation of the pancreas), cystic
fibrosis, and biliary diseases (illnesses of the gallbladder and biliary ducts).
Symptoms of deficiency include muscle weakness, loss of muscle mass, abnormal
eye movements, impaired vision, and unsteady gait. Eventually, kidney and liver
function may be compromised. In addition, severe vitamin E deficiency can be
associated with serial miscarriages and premature delivery in pregnant women.
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Heart disease
Vitamin E helps prevent arteries from clogging by blocking the conversion of
cholesterol into the waxy fat deposits called plaque that stick to blood vessel
walls. Vitamin E also thins the blood, allowing for blood to flow more easily
through arteries even when plaque is present. Studies in the last 10 years have
reported beneficial results from use of vitamin E supplements as part of a
prevention strategy for heart disease and other types of cardiovascular disease.
A large, important study of postmenopausal women, for example, suggested that
vitamin E from foods may reduce the risk of death from stroke in postmenopausal
women. The study results do not, however, support any need for supplementation
with vitamin E or other antioxidant vitamins as part of a preventive strategy.
There is some evidence for the use of supplemental vitamin E as a treatment
for atherosclerosis. For example, a 2-year study of men with a history of stroke
compared aspirin with and without vitamin E and found that vitamin E with
aspirin significantly reduced the tendency of plaque to stick to vessel walls
and decreased the risk of stroke.
Still, when looked at collectively, results of studies have been mixed and a
lot more evidence is needed to know if there are benefits to supplementing with
vitamin E, whether for prevention or for treatment of cardiovascular disease.
Four large, well-designed trials are currently in progress and should help
resolve this question.
Cancer
While no firm conclusions can be drawn about vitamin E's ability to protect
against cancer, it has been noted that people with cancer often have lower
levels of vitamin E. Plus, population based trials (observing groups of people
over long periods of time) suggest that diets rich in antioxidants, including
vitamin E, may be connected to a reduced risk of certain types of cancer, such
as colon cancer. Supplementation with vitamin E, though, does not appear to
improve risk of cancer.
Laboratory studies have generally shown that vitamin E inhibits the growth of
some cancers in test tubes and animals, particularly hormone responsive cancers
such as breast and prostate. There is reason to believe, therefore, that, for
these types of cancers at least, supplementation may prove beneficial for both
prevention and treatment. .
Despite the encouraging results from test tube and animal studies, however,
research on people has been much less promising. A large, important study called
the Iowa Women's Health Study, for example, involving nearly 35,000 women,
looked at the dietary intake of antioxidants and occurrence of breast cancer
after menopause. They found little evidence that vitamin E has a protective
effect. More research is needed before coming to any firm conclusions about
whether added vitamin E has an impact on cancer and, if so, which forms of the
vitamin are most effective for treatment and what optimal dosing would be.
Researchers have also pointed to the fact that the body's antioxidant defense
system is complex, which suggests that focusing on one vitamin in isolation may
not be the best approach. This may be why dietary forms of antioxidants, since
they are generally taken together from foods, may be the best way to try to
stave off cancer.
Photodermatitis
This condition involves an allergic type reaction to the UV rays of the sun.
An 8-day study comparing treatment with vitamins C and E to no treatment found
that the vitamin group became significantly less sensitive to the sun. Another
study, lasting for 50 days, also showed a protective effect of the combination
of vitamins C and E to UV rays.
Osteoarthritisis
A few studies suggest that vitamin E may be helpful in both the treatment
(pain relief, increased joint mobility) and prevention (at least in men) of
osteoarthritis. In a study comparing vitamin E with diclofenac, a non-steroidal
anti-inflammatory drug (NSAID) used to treat osteoarthritis, the two were found
to be equally effective.
Vitamin E for Alzheimer's Disease
There are several reasons why vitamin E might help treat
Alzheimer's Disease.
The fat soluble vitamin readily enters the brain and exerts its antioxidative
properties. Oxidative stress is believed to contribute to the development of
Alzheimer's Disease; therefore, again, it makes at least theoretical sense that
antioxidants, like vitamin E, help prevent this condition. In fact, studies have
suggested that vitamin E supplementation improves cognitive performance in
healthy individuals and in those with dementia from causes other than
Alzheimer's (for example, multiple strokes). In addition, vitamin E, together
with vitamin C may prevent the development of Alzheimer's Disease.
Menopause
According to a review article on alternatives to hormone replacement therapy
(HRT) for women with breast cancer, vitamin E is the most effective option for
the reduction of hot flashes for this group of women. Presumably, this would be
true for other women not taking HRT because they cannot or prefer not to.
Vitamin E also helps reduce other long term risks associated with menopause such
as Alzheimer's, macular degeneration (see Eye health below), and cardiovascular
disease.
Eye Health
Because of it's antioxidant action, vitamin E may help to protect against
cataracts (clouding of the lens of the eye) and age related macular degeneration
(ARMD, a progressive deterioration in the retina, the back part, of the eye).
Both of these eye disorders tend to occur as people age. These conditions
seriously compromise eyesight and ARMD is the number one cause of blindness in
the United States. In order to minimize risk of ARMD, research reviews advocate
diets high in vitamins C and E and carotenoids, especially spinach, kale, and
collard greens. Taking supplements as a preventive measure, as opposed to
getting vitamin E from food sources, remains controversial.
Uveitis is another eye disorder for which the antioxidant vitamins C and E
may be helpful. A study of 130 patients with uveitis compared treatment with
oral vitamins C and E to placebo and found that those who took the vitamins had
significantly better visual clarity than those in the placebo group. Uveitis is
inflammation of the uvea, the middle layer of the eye between the sclera (white
outer coat of the eye) and the retina (the back of the eye). The uvea contains
many of the blood vessels that nourish the eye. Inflammation of this area,
therefore, can affect the cornea, the retina, the sclera, and other important
parts of the eye. Uveitis occurs in acute and chronic forms.
Diabetes
People with diabetes tend to have low levels of antioxidants. This may
explain, in part, their increased risk for conditions such as cardiovascular
disease. Vitamin E supplements and other antioxidants may help reduce the risk
of heart disease and other complications in people with diabetes. In particular,
antioxidants have been shown to help control blood sugar levels, to lower
cholesterol levels in those with type 2 diabetes, and to protect against the
complications of retinopathy (eye damage) and nephropathy (kidney damage) in
those with type 1 diabetes.
Vitamin E may also play a role in the prevention of diabetes. In one study,
944 men who did not have diabetes at were followed for 4 years. Low levels of
vitamin E was associated with an increased risk of becoming diabetic in that
time course.
Pancreatitis
Oxidative stress plays a role in pancreatitis (inflammation of the pancreas).
In fact, those with pancreatitis have low levels of vitamin E and other
antioxidants. This may be due to lack of absorption of fat soluble vitamins
(such as vitamin E) because the enzymes from the pancreas required to absorb fat
are not functioning properly. Or, this may be due to poor intake because those
with pancreatitis are not eating due to pain and need for bowel rest. Some
experts relay that taking vitamin E and other antioxidants may help to reduce
the pain and inflammation associated with pancreatitis.
Other
Vitamin E, along with other standard treatments, may also be beneficial for
the following:
- Slowing the aging of cells and tissues
- Protecting from frostbite and other cold-induced injuries
- Diminishing the negative effects of environmental pollutants
- Improving anemia
- Speeding wound and burn healing
- Reducing scarring
- Lowering blood pressure
- Slowing progression of Parkinson's disease
- Easing premenstrual discomfort, especially breast tenderness
- Treating lupus
- Replacing necessary nutrients in those with inflammatory bowel disease,
such as ulcerative colitis
- Avoiding miscarriage (also called spontaneous abortion), which may be
associated with very low levels of this nutrient
- Helping weight gain and relieving oxidative stress in those with HIV or
AIDS
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The richest source of vitamin E is wheat germ. Other foods that contain a
significant amount of vitamin E include liver, eggs, nuts (almonds, hazelnuts,
and walnuts); sunflower seeds; corn-oil margarine; mayonnaise; cold-pressed
vegetable oils, including olive, corn, safflower, soybean, cottonseed, and
canola; dark green leafy vegetables like spinach and kale; greens (beet,
collard, mustard, turnip) sweet potatoes; avocado, asparagus and yams.
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Vitamin E refers to a family of eight related fat soluble compounds, the
tocopherols and tocotrienols (in four different forms, alpha, beta, delta and
gamma) Dosages are usually listed in international units (IUs). There are both
natural and synthetic forms of vitamin E. Health care providers usually
recommend natural vitamin E (d-alpha-tocopherol) or natural mixed tocopherols.
The synthetic form is called dl-alpha-tocopherol.
Some clinicians prefer mixed tocopherols because it most closely represents
whole foods.
Most vitamin E supplements are fat-soluble. However, water soluble E is
available for people who have trouble absorbing fat, such as people with
pancreatic insufficiency and cystic fibrosis.
Vitamin E is available in softgels, tablets, capsules, and topical oils.
Doses for oral vitamin E generally range from 50 IU to 1,000 IU.
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How to Take Vitamin E
Based on clinical trials, the recommended dose for disease prevention and
treatment for adults is 400 to 800 IU/day. As with all supplements, it is
important to check with a healthcare provider before giving vitamin E to a
child.
Daily intakes of dietary Vitamin E are listed below. (Note: 1 mg vitamin E
equals 1.5 IU.)
Pediatric
- Newborn to 6 months: 6 IU
- Infants 6 months to 1 year: 9 IU
- Children 1 to 3 years: 9 IU
- Children 4 to 8 years: 10.5 IU
- Children 9 to 13 years: 16.5 IU
- Adolescents 14 to 18 years: 22.5 IU
Adult
- Older than 18 years: 22.5 IU
- Pregnant females: 22.5 IU
- Breastfeeding females: 28.5 IU
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Because of the potential for side effects and interactions with medications,
dietary supplements should be taken only under the supervision of a
knowledgeable healthcare provider.
Vitamin E should be taken together with another antioxidant called selenium.
The Tolerable Upper Intake Limit (UL) for alpha-tocopherol is set at 1000 mg
(1500 IU). Doses higher than this can cause nausea, gas, diarrhea, heart
palpitations, and increase the tendency to bleed.
It is especially important that those who have high blood pressure or who are
taking blood-thinners such as warfarin check with a healthcare provider before
taking vitamin E supplements.
There is some concern that a diet rich in fish oil taken for many months may
induce a deficiency of vitamin E. People who eat a diet high in fish or who take
fish oil supplements may want to consider taking vitamin E supplements.
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If you are currently being treated with any of the following medications, you
should not use vitamin E supplements without first talking to your healthcare
provider.
Vitamin E inhibits the uptake by cells of the antidepressant desimpramine,
which belongs to a class of drugs known as tricyclics. Other members of that
class include imipramine and
nortriptyline.
Vitamin E and Antipsychotic Medications
Vitamin E can inhibit the uptake by cells of the
antipsychotic medication
called chlorpromazine, which belongs to a class of drugs known as phenothiazines.
AspirinA study evaluating the effects of vitamin E and aspirin suggests that
the combination appears to be safe and may benefit patients at risk for stroke.
AZT
Vitamin E may protect against toxicity and side effects from AZT, a
medication used to treat HIV and AIDS.
Beta Blockers for high blood pressure
Vitamin E inhibits the uptake by cells of propranolol, a member of a class of
medications called beta blockers used for high blood pressure. Other
beta-blockers include atenolol and metoprolol.
Birth Control Medications
Vitamin E may provide antioxidant benefits to women taking birth control
medications.
Chloroquine
Vitamin E can inhibit the uptake into cells of chloroquine, a medication used
to treat malaria.
Cholesterol-lowering Medications
Cholesterol-lowering medications such as colestipol and cholestyramine,
called bile-acid sequestrants, decrease the absorption of vitamin E. Gemfibrozil,
a different type of cholesterol-lowering medication called a fibric acid
derivative, may also reduce vitamin E levels. A third class of medications used
to lower cholesterol levels known as statins (such as atorvastatin, pravastatin,
and lovastatin), may reduce the antioxidant activity of vitamin E. On the other
hand, the combination of vitamin E supplements with statins may help protect
blood vessels from dysfunction.
Cyclosporine
Vitamin E may interact with cyclosporine, a medication used to treat cancer,
reducing the effectiveness of both the supplement and the medication. However,
there appears to be some controversy regarding the nature of this interaction;
another study suggests that the combination of vitamin E and cyclosporine may
actually increase the effects of the medication. More research is needed to
determine the safety of this combination.
Hormone Replacement Therapy
Vitamin E supplements may benefit women taking hormone replacement therapy by
improving lipid profiles.
Mebendazole
Simultaneous supplementation with vitamins A, C, E, and selenium
significantly reduced the effectiveness of this vermifuge (treatment to
eradicate intestinal worms) in a study.
Tamoxifen
Tamoxifen, a hormonal treatment for breast cancer, increases blood levels of
triglycerides, increasing one's chances of developing high cholesterol. In a
study of 54 women with breast cancer, vitamins C and E, taken along with the
tamoxifen, counteracted this by decreasing low density cholesterol and
triglyceride levels while increasing high density cholesterol. The antioxidants
also enhanced the anti-cancer action of the tamoxifen.
Warfarin
Taking vitamin E at the same time as warfarin, a blood-thinning medication,
increases the risk of abnormal bleeding, especially in vitamin K-deficient
individuals.
Weight Loss Products
Orlistat, a medication used for weight loss and olestra, a substance added to
certain food products, are both intended to bind to fat and prevent the
absorption of fat and the associated calories. Because of their effects on fat,
orlistat and olestra may also prevent the absorption of fat-soluble vitamins
such as vitamin E. Given this concern and possibility, the Food and Drug
Administration (FDA) now requires that vitamin E and other fat soluble vitamins
(namely, A, D, and K) be added to food products containing olestra. How well
vitamin E from such food products is absorbed and used by the body is not clear.
In addition, physicians who prescribe orlistat may add a multivitamin with fat
soluble vitamins to the regimen.
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Reviewed: 01/2006
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