Many population studies have found that people with higher levels of vitamin E in their bodies have a lower risk of heart disease. So researchers investigated whether taking vitamin E supplements might help prevent heart disease. But the results have not shown that vitamin E helps.
One of the largest studies, the Heart Outcomes Prevention Evaluation (HOPE) trial, found that taking 400 IU of vitamin E (d-alpha-tocopherol) daily did not lower the number of heart attacks, strokes, or deaths from heart disease among men and women who already had heart disease or were at high risk for it.
What about otherwise healthy people who were at low risk for heart disease? Two large trials also found no protection from vitamin E. In one -- the Physicians' Health Study II -- vitamin E was associated with a higher risk of stroke. This study generated a lot of controversy and is still being debated today.
One large clinical study suggested that vitamin E from foods -- not supplements -- may reduce the risk of death from stroke in postmenopausal women.
Population studies (observing large groups of people over time) suggest that eating foods high in vitamin E and other antioxidants may help prevent cancer. And studies have shown that people with cancer often have lower levels of vitamin E. Researchers wondered if antioxidants like vitamin E can help prevent cancer. But evidence about vitamin E supplements has not backed this up.
Several large clinical studies found that women who take vitamin E supplements do not have a lower risk of developing breast cancer. And one large study found that men who took 400 IU of vitamin E every other day for 8 years did not have a lower risk of overall cancer than those who took placebo.
Vitamin E also does not seem to protect against colorectal cancer in women or people with diabetes. There is some evidence that taking vitamin E along with vitamin A and vitamin C or as part of a multivitamin may offer some protection to people who had colorectal adenomas. Colorectal adenomas are considered to be a forerunner to colon cancer.
Vitamin E does not seem to protect against lung cancer or pancreatic cancer.
The evidence about vitamin E and prostate cancer is mixed. Some population studies suggest that people who take more vitamin E have a lower risk of prostate cancer. But some find the opposite: One study found that men who took a multivitamin more than 7 times per week along with a separate vitamin E supplement had an higher risk of prostate cancer. And another study of 35,000 men found that those who took a vitamin E supplement had a 17 percent increase in the risk of developing prostate cancer than those who took placebo.
One clinical trial found that taking a combination of 30 mg vitamin E (alpha-tocopherol), 120 mg vitamin C, 6 mg beta-carotene, 100 mcg selenium, and 20 mg zinc did not lower the overall risk of prostate cancer, but it might reduce the risk in men whose PSA levels were normal. High PSA levels can indicate prostate cancer.
Another large study of 29,133 smokers found that those taking 50 mg daily of vitamin E (dl-alpha-tocopherol, or synthetic vitamin E) had a lower risk of prostate cancer and deaths caused by prostate cancer.
Researchers note that taking antioxidant supplements may not work as well as eating antioxidant foods. Many experts believe getting antioxidants from foods may be the best way to protect against cancer.
Also, there is only limited evidence that taking large doses of vitamin E if you have been diagnosed with cancer may help your treatment. One study of 108 people taking the chemotherapy therapy drug cisplatin found that taking a vitamin E supplement during and as long as 3 months after treatment reduced nerve damage that can happen when taking cisplatin. However, some doctors worry that large doses of antioxidants from supplements could interfere with chemotherapy medications. If you are undergoing chemotherapy, talk to your doctor before taking vitamin E or any supplement.
This condition involves an allergic type reaction to the UV rays of the sun. An 8-day clinical study comparing treatment with vitamins C and E to placebo found that people who took the vitamins became significantly less sensitive to the sun. Another clinical study, lasting for 50 days, also showed a protective effect of the vitamin C and E combination.
Evidence is mixed as to whether vitamin E can help prevent or treat Alzheimer's disease. Some researchers believe that antioxidants may help prevent Alzheimer's disease. One study in 2010 found that people who had levels of all the forms of vitamin E -- not just d-alpha-tocopherol, the kind usually found in supplements -- were less likely to develop Alzheimer's. But another study found that people who had early symptoms of Alzheimer's and took vitamin E supplements went on to develop the disease at the same rate as those who took placebo.
In one study with positive results, 341 people with Alzheimer's disease took either 2,000 IU of vitamin E (dl-alpha-tocopherol), the drug selegiline, or placebo. Those who were given vitamin E took about 200 days longer for the disease to progress to severe than those who took placebo. However, selegiline worked even better.
Vitamin E (400 IU) combined with other antioxidants -- including zinc (80 mg), beta-carotene (15mg), and vitamin C (500 mg) -- seems to protect against developing macular degeneration (AMD). AMD is the leading cause of legal blindness in people over 55 in the United States. People with advanced AMD seemed to get the biggest benefit. Researchers don't know whether this combination of nutrients helps prevent AMD or helps people with less advanced AMD.
Vitamins E and C may also help treat uveitis. Uveitis is inflammation of the uvea, the middle layer of the eye between the sclera (white outer coat of the eye) and the retina. A clinical study of 130 people with uveitis found that those who took these vitamins had clearer vision than those who took placebo.
A few studies have found that vitamin E may help relieve menstrual pain or dysmenorrhea. In one study, taking 500 IU of vitamin E for 2 days before and 3 days after their period started had less pain than those who took placebo.
A few studies also suggest that vitamin E supplements may help reduce PMS symptoms, including anxiety, craving, and depression.
People with diabetes tend to have low levels of antioxidants, which has led some researchers to theorize that this might explain why they're at increased risk for conditions such as heart disease.
Vitamin E supplements and other antioxidants may help reduce the risk of heart disease and other complications in people with diabetes. Research shows that antioxidants may help control blood sugar levels and lower cholesterol levels in people with type 2 diabetes while protecting against the complications of eye damage (retinopathy) and kidney damage (nephropathy) in those with type 1 diabetes. One study found that people with type 2 diabetes who took 400 IU of vitamin E daily reduced their risk of heart attack and of dying from heart disease.
However, not all studies have found that taking vitamin E supplements helps people with diabetes. If you have diabetes, ask your doctor whether a vitamin E supplement would be right for you.
Some studies suggest that taking vitamin E along with vitamin C may help prevent pre-eclampsia in women who are at high risk. Women with pre-eclampsia have high blood pressure and too much protein in the urine. Pre-eclampsia is a common cause of premature births. Not all studies agree, however.
Some small studies have suggested that vitamin E supplements may help treat tardive dyskinesia -- involuntary, repetitive movements that are a side effect of taking some medications for a long time. However, not all studies have found that vitamin E can help. The largest study found that taking 1,600 IU of vitamin E daily for at least one year was no better at reducing tardive dyskinesia symptoms than placebo. If you want to try vitamin E for tardive dyskinesia, ask your doctor about it.
One study suggests that taking vitamin E along with standard medications for rheumatoid arthritis may help reduce pain -- but not inflammation -- better than standard medications alone.
If you are being treated with any of the following medications, you should not use vitamin E supplements without first talking to your health care provider:
Antidepressant medications -- Vitamin E interferes with the absorption of the antidepressant desipramine (Norpramin). Desipramine belongs to a class of drugs known as tricyclics. Other tricyclics include imipramine (Tofranil) and nortriptyline (Pamelor).
Antipsychotic medications -- Vitamin E can interfere with the body’s absorption of the antipsychotic medication called chlorpromazine (Thorazine). Chlorpromazine belongs to a class of drugs known as phenothiazines.
Aspirin -- Because vitamin E can increase the risk of bleeding, people who take aspirin should talk to their doctor before taking vitamin E supplements.
AZT -- Vitamin E may protect against toxicity and side effects from AZT, a medication used to treat HIV and AIDS.
Beta-blockers -- This type of medication is used to treat high blood pressure. Vitamin E interferes with the body’s absorption of propranolol (Inderal), a kind of beta-blocker. Other beta-blockers include:
- Acebutolol (Sectral)
- Atenolol (Tenormin)
- Bisoprolol (Zebeta)
- Carteolol (Cartrol)
- Metoprolol (Toprol XL)
- Nadolol (Corgard)
- Propranolol (Inderal)
Bile acid sequestrants -- These medications, used to lower cholesterol, may reduce how much vitamin E your body absorbs. These medications include
- Cholestyramine (Questran, Prevalite)
- Cholestipol (Colestid)
Statins -- Taking a combination of antioxidants, including vitamins E and C, selenium, and beta-carotene, along with niacin and simvastatin (Zocor) seems to keep niacin and Zocor from raising “good” HDL cholesterol. Researchers don't know whether vitamin E alone would have the same effect, or whether it would happen with other statins. Ask your doctor before taking vitamin E if you also take a statin. Statins include:
- Lovastatin (Mevacor)
- Simvastatin (Zocor)
- Pravastatin (Pravachol)
- Atorvastatin (Lipitor)
- Fluvastatin (Lescol)
- Rosuvastatin (Crestor)
Gemfibrozil -- This medication, used to lower cholesterol, may also reduce vitamin E levels.
Cyclosporine -- Vitamin E may interact with cyclosporine, a medication used to treat cancer, making both vitamin E and cyclosporine less effective. However, another study suggests that the combination of vitamin E and cyclosporine may actually make cyclosporine work better. Ask your doctor before taking vitamin E if you take cyclosporine.
Chemotherapy drugs -- Some doctors worry that antioxidants like vitamin E may reduce the effectiveness of chemotherapy drugs, including chlorambucil, busulfan, doxorubicine, carmustine, thiopeta, and cyclophosphamideradicals. However, other researchers think that antioxidants may make chemotherapy work better. Talk to your oncologist before taking vitamin E or any supplement.
Tamoxifen -- Tamoxifen, a treatment for breast cancer, boosts blood levels of triglycerides, increasing the risk of developing high cholesterol. In a study of 54 women with breast cancer, vitamins C and E, taken along with tamoxifen, reduced this side effect. These vitamins reduced "bad" low LDL cholesterol and triglyceride levels while raising "good" HDL cholesterol. Vitamins C and E also made the anti-cancer action of the tamoxifen stronger.
Warfarin (Coumadin) -- Taking vitamin E at the same time as other blood-thinners can increase the risk of bleeding.
Orlistat (Alli) -- This medication is used for weight loss. It stops your body from absorbing some fat and calories. It may also prevent the absorption of fat-soluble vitamins such as vitamin E. Doctors who prescribe orlistat may add a multivitamin with fat-soluble vitamins.
Vitamin E may also interact with:
- Calcium channel blockers, including
- Nifedipine (Procardia)
- Amlodipine (Norvasc)
- Verapamil (Calan, Isoptin)
- Diltiazem (Cardizem)
- Felodipine (Plendil)
- Nisoldipine (Sular)
- Bepridil (Vascor)
- Cisapride (Propulsid)
- Fluoxetine (Prozac)
- Fexofenadine (Allegra)
- Omeprazole (Prilosec).
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