What Is vitamin E:
Scientists identified vitamin E about 80 years ago, but only in the past few decades has its power as an antioxidant been revealed and fully appreciated. Initially, there was great interest and excitement regarding what this vitamin could do for a number of ailments, particularly heart disease. Well-designed studies completed recently, however, have found that the effect may be a less beneficial than once thought.
One point on which most sources agree is that vitamin E-rich foods are the optimal way to ensure adequate levels of this nutrient in the body. Wheat germ, almonds, peanuts, vegetable oils (safflower, corn, soybeans), green leafy vegetables, and walnuts are just a few prime sources. Given that many of these foods are also high in fat and calories, however, it's also worth considering a vitamin E supplement of 400 IU daily.
When summoned from the body's fatty tissue where it's stored, vitamin E--and it's antioxidant powers--go into action, protecting cells by deactivating or destroying the potentially damaging oxygen molecules called free radicals. Vitamin E also helps in the formation of red blood cells and facilitates the use of the trace mineral selenium and vitamins A and K.
Vitamin E is actually an umbrella term for a group of compounds called tocopherols and tocotrienols. Until recently, most vitamin E products contained only tocopherols (alpha-, beta-, delta-, and gamma-tocopherols), with alpha-tocopherol recognized as the body's predominant and most potent form.
But this thinking is changing as researchers also are identifying heart-healthy powers in the tocotrienols. Manufacturers now offer combination products, although tocotrienols are still easiest to find in single supplement form. To realize vitamin E's full health benefits, however, you really need both tocopherols and tocotrienols.
Health Benefits of vitamin E:
As a key antioxidant, vitamin E appears to play a modest but notable role in protecting the body from many chronic disorders. It may even slow the aging process and guard against damage from secondhand smoke and other pollutants. According to test-tube studies, the tocotrienols (alpha-tocotrienol, specifically) appear to be the most powerful of the vitamin E antioxidants. Circulatory disorders, skin and joint problems, diabetes-related nerve complications, high cholesterol, endometriosis, immune-system function, and memory are also believed to benefit from vitamin E. To date, however, research has been more intriguing than definitive.
The healing powers of regular vitamin E supplements (that is, those containing tocopherols only) are often merged with those of vitamin C, a sister antioxidant that actually increases the effectiveness of vitamin E. This combination holds some promise for preventing and possibly easing complications of such disorders as congestive heart failure, alcoholism, cancer, HIV infection, lupus, multiple sclerosis and nail problems.
On the other hand, a number of disappointing or ambiguous clinical trial results were published in the late 1990s and early 2000s. A large study on Parkinson's disease, a neurologic condition, for example, indicated that taking vitamin E neither helped nor hurt its symptoms.
Specifically, vitamin E may help to:
Prevent or delay heart disease and related complications. Vitamin E's ability to protect against cardiovascular disease has been intensively studied and was initially thought to be very promising. The vitamin appears to prevent the oxidation of LDL ("bad") cholesterol, the first step in the development of atherosclerosis, a buildup of plaque in the arteries that inhibits normal circulation.
Additionally, vitamin E is believed to help prevent the formation of blood clots and to minimize the inflammatory process involved in heart disease development. Still a matter of debate, however, is whether an antioxidant such as vitamin E (including both tocopherols and tocotrienols) can prevent strokes, which aren't directly related to atherosclerosis.
Studies designed to answer the question as to whether vitamin E can actually prevent heart disease in people who are currently healthy (with no heart disease) are generating confusing and conflicting results. In two large studies at the Harvard School of Public Health, vitamin E supplements lowered the risk of heart disease in both women and men by about 40%. Other positive lifestyle factors may partially account for this apparent benefit, however, leaving the true contribution of the supplements in question.
In 2003, a major study published in the American Heart Association's journal, Circulation, indicated that vitamin E showed no benefit for preventing heart attacks. The researchers, again from Harvard, followed the levels of major carotenoids (including beta-carotene) and certain tocopherols from vitamin E in the blood of otherwise healthy physicians over the course of 13 years. They found that levels of beta-carotene and tocopherols in 531 physicians who went on to have a heart attack were similar to levels in a group of 531 similar men who did not have a heart attack.
Vitamin E supplements also appear to produce no actual therapeutic (healing) effect in people who are already sick with heart disease. Major, well-designed trials comparing vitamin E supplements to other drugs such as statins or a placebo (a dummy pill) proved disappointing, with vitamin E showing no benefit over the placebo in most cases. One clearly positive effect of statins is to raise HDL ("good") cholesterol; recent studies, however, indicate that vitamin E and other antioxidant supplements seem to actually reduce this beneficial effect.
Disappointing results were reported from the widely publicized HOPE study (Heart Outcomes Prevention Evaluation Study), which followed nearly 10,000 people at high risk for heart attack or stroke for more than four years. The participants who took 400 IU of vitamin E daily experienced about the same number of heart disease complications and hospitalizations for chest pain or heart failure as did those participants on a placebo. On the other hand, the drug tested (an ACE inhibitor called ramipril) proved very effective.
An extension of the HOPE trial (called HOPE-TOO), published in September, 2003, found that after seven years, there was no apparent heart-health benefit from taking vitamin E: 21.4% of patients given vitamin E experienced heart attack, stroke, or death from heart disease compared with 20.6% of participants on a placebo.
Still, the subject of vitamin E and heart benefits remains muddled. Earlier investigations seemed to indicate that the supplement can clearly inhibit the progression of atherosclerosis in individuals with existing heart disease. In the Cambridge Heart Antioxidant Study, published in the British medical journal Lancet in 1996, people with coronary atherosclerosis who took vitamin E had a 77% lower risk of subsequent (nonfatal) heart attack than those who took a placebo. A separate study investigating the cholesterol-lowering effects of tocotrienols specifically--they appear to inhibit the liver's synthesis of cholesterol--found that large doses could lower LDL cholesterol by 10%.
Protect against prostate and other cancers. As an antioxidant, vitamin E helps to safeguard cell membranes from the damaging effects of free radicals that can play a role in the development of cancer. The vitamin may also help fight cancer by boosting the immune system. It remains unclear, however, whether these beneficial actions on reducing free-radical (DNA oxidation) activity actually leads to a protective effect against cancer, a complex disease.
Research findings so far are confusing at best. One Finnish study reported a reduced incidence of prostate cancer (and death from the disease) in male smokers who took vitamin E (50 IU daily) for five to eight years; it remains speculative, however, as to whether it was the vitamin E that made the difference. Other trials indicate that increased dietary vitamin E may reduce the risk of colon cancer, particularly in women under age 65. To confuse matters further, a separate study of nearly 2,000 adults who developed colon cancer found that the amount of vitamin E they took was no different than dosages taken by those without cancer.
Prevent or delay cataracts and macular degeneration. Animal studies indicate that vitamin E protects against cataracts, a clouding of the lens of the eye that is a leading cause of blindness in older people. So far most studies have shown only a minor protective effect, although one study of 764 people reported that taking vitamin E supplements cut the incidence of cataracts in half. One recent study in humans found that the risk of late-stage macular degeneration, a potentially blinding eye disorder, was significantly lower in older adults who had high levels of vitamin E in their bloodstream.
Slow the progression of Alzheimer's disease and dementia. No one knows exactly what causes this progressive loss of memory and nerve function, but one theory is that over time, free radicals gradually damage nerve fibers. Columbia University researchers reported that very high doses of vitamin E (2,000 IU a day) slowed the progression of Alzheimer's disease. In fact it proved as effective at this as selegiline, a prescription drug commonly used to treat Alzheimer's.
However, no research has shown that vitamin E can actually prevent Alzheimer's disease from developing in the first place.
Retard the aging process and boost immune function. With age, the immune system becomes less efficient at fighting off microbes and viruses. Part of this decline may be due to low levels of vitamin E in the bloodstream. Some studies have shown improved immune responses in older people who take vitamin E supplements. Vitamin E may also slow the effects of aging by protecting cells from free-radical damage.
Promote healing of burns, eczema, and other skin problems. When applied to the skin, vitamin E-containing creams or oils are believed to promote healing, protecting cells from free-radical damage and reducing itchiness. Many people use such products to ensure optimal skin health.
Note: Vitamin E has also been found to be useful for a number of other disorders. For information on these additional ailments, see our Dosage Recommendations Chart for Vitamin E.
The current Recommended Intake (or RDA) for vitamin E is 15 mg, equal to about 23 IU daily.
If You Get Too Little:
A vitamin E deficiency can lead to neurological damage. This is quite rare, however, occurring primarily in people suffering from metabolic diseases that inhibit fat absorption (vitamin E is a fat-soluble vitamin). The RDA is easy for most people to obtain if they eat a well-balanced diet containing even a minimum amount of polyunsaturated fat.
If You Get Too Much:
Vitamin E appears to be safe when consumed in amounts up to 1,000 IU a day, although diarrhea and headaches have been reported in some people. Doses of over 800 IU a day of vitamin E may interfere with the body's ability to clot blood, posing a risk to people taking blood thinners (anticoagulants). In addition, high doses of vitamin E may inhibit the absorption of vitamin A.
General Dosage Information:
Special tips: For most people, supplement dosages for vitamin E should be relatively low (400 IU or less), as there are apparent risks in taking very high doses. It turns out that in some situations antioxidants such as vitamin E can actually turn into potentially cancer-promoting pro-oxidants. The exact amount of vitamin E needed for disease-protecting effects remains to be determined. It most likely varies from person to person.
--Vitamin E is particularly effective when taken with vitamin C, which increases its absorption by the body.
--For topical use, commercial creams containing vitamin E are easy to find. Alternatively, you can break open a capsule or prick at softgel and gently rub the oil directly into the affected area.
--Vitamin E is available in natural and synthetic forms. The latest findings indicate natural vitamin E supplements seem to be superior to the synthetic forms. Most studies showing health benefits for vitamin E have used synthetic forms, which are cheaper and more widely available than the natural ones. (Natural forms will be designated with a "d," as in d-alpha. Synthetic forms will be designated with a "dl," as in dl-alpha.)
--Products marked as "mixed tocopherols" (alpha, beta, delta and gamma) are absorbed well and also make a good choice.
--In addition to the following vitamin E dosages for tocopherols indicated below, take 100 mg tocotrienols daily.
* For general health: Take 200-400 IU daily.
* For heart disease prevention: Take up to 800 IU daily.
* For cancer prevention: Take up to 800 IU daily.
* Vitamin E's mild blood-thinning effect could cause problems if it is routinely taken with anticoagulant (blood-thinning) drugs such as warfarin or blood-thinning dietary supplements such as ginkgo. Aspirin could also present problems in this regard. Consult your doctor before taking such a combination.
Note: For information on interactions with specific generic drugs, see our WholeHealthMD Drug/Nutrient Interactions Chart.
Because of vitamin E's effect on blood clotting, don't take supplements for two days before or after any type of surgery (including dental surgery). The minimum amount of vitamin E it takes to alter blood clotting is about 30 IU a day.
A number of chemotherapy and radiation treatments are designed to actually create free radicals for the purpose of killing cancer cells. If you are undergoing cancer treatment, don't take antioxidants such as vitamin E supplements without consulting your oncologist first. Otherwise, you may be working counter to what the cancer treatment is designed to do.
Consult your doctor before taking vitamin E if you have high blood pressure that is poorly controlled; the increased risk for bleeding with vitamin E could possibly lead to a greater risk for the complications of high blood pressure, such as hemorrhagic stroke (bleeding in the brain)
||400 IU a day; this may be partially covered by your daily multivitamin/antioxidant.
|| 400 IU twice a day; may be partially covered by basic multivitamin and antioxidant.
|| 400 IU a day until healed; may be partially covered by daily multivitamin/antioxidant complex
|| 400 IU twice a day; may be partially covered by daily multivitamin or antioxidant complex
|| 400 IU a day; may be covered by daily multivitamin and antioxidant complex
|| 400 IU once a day; all or part may be covered by your multivitamin/antioxidant
Articles of vitamin E:
Vitamin E Lowers Risk of Prostate Cancer
Antioxidants May Benefit Pregnant Women At Risk For Pre-Eclampsia
Vitamin E for Vision (France)