Medicine For People!

November 2004 Part 2: Vitamin E, Mixed Tocopherols, Mail Order Drugs

  • Vitamin E — Harmful to Your Health?
  • Mixed Tocopherols
  • Mail Order Drugs — Proceed With Caution

Are Vitamin E Supplements Harmful?

The Annals of Internal Medicine published a study recently titled "Meta-Analysis: High-Dosage Vitamin E Supplementation May Increase All-Cause Mortality." The newspapers headline writers couldn't resist making a good story better, so we've had a number of patients call, concerned that use of vitamin E might be harming them.

The short answer is that I don't think so. Here are the details.

First, take a look at the paper itself. What these authors did was to locate 36 studies which, among other study observations, recorded death rates and doses of vitamin E. Of these, they selected 19 to include in their summary analysis.

In all these studies, overall death rate of study participants was recorded, as well as their approximate dose of vitamin E. Look at figure 3 to see a graph of death rates versus dose of vitamin E. There are 19 circles on the graph, the larger circles associated with larger studies. The higher the circle is above the baseline, the higher the death rate in the study. The further the circle is to the right, the higher the dose of vitamin E. If increasing doses of vitamin E clearly increased death rates, you'd see a series of cicles extending from the lower left corner of the graph to the upper right corner. Nature isn't always that simple, so mathematicians will often impose a curve on the data points to get an idea of the general relation. As you can see from figure 3 above, the data points are pretty much scattered over the entire graph. In nine studies, vitamin E supplements appeared to be harmful; in eight studies vitamin E appeared to be beneficial, and in one study it appeared to make no difference. The authors have superimposed their mathematical curve on the figure to indicate that according to the statistical method they chose, the risk seems to very slightly rise with increasing dose of vitamin E.

The reasons I find this study underwhelming are:

1. The study participants all had serious chronic illnesses. As the study authors note "High-dosage (400 IU/d) trials were often small and were performed in patients with chronic diseases. The generalizability of the findings to healthy adults is uncertain."

2. Remember that many of the studies represented in figure 3 were small studies looking at the effect of vitamin E and other nutrients on heart disease, colonic polyps, osteoarthritis, eye disease, muscular diseases, and so forth, and were not designed to look at the safety of vitamin E. Then look at figure 3. Take away the curve that the study authors superimpose. Look at the circles spread almost at random over the graph and ask why they do not demonstrate a convincing relationship between dose and death rates for vitamin E. If higher doses are truly harmful, why do the studies abbreviated PPS, GISSI, and ADCS have circles below the line of neutral effect and show that in those studies higher doses appeared to be beneficial? HOPE and GISSI are two large studies that showed either no harm, or showed a positive benefit. This is why the authors titled their study "may increase." I don't think it looked too convincing to them either.

3. Again looking at figure 3, note the circle labeled CHAOS (which stands for Cambridge Heart Antioxidant Study), which, on figure 3, makes the statistical curve rise and indicate a risk from vitamin E. Then read the abstract by the authors of that study, who state "the ... excess of cardiovascular deaths in the alpha-tocopherol group ... was non-significant... We conclude that in patients with angiographically proven symptomatic coronary atherosclerosis, alpha-tocopherol treatment substantially reduces the rate of non-fatal MI, with beneficial effects apparent after 1 year of treatment." Translation: In people with blocked arteries vitamin E reduced heart attacks. So, the Cambridge University folks thought vitamin E was helpful, but this new study takes a little piece of their work and puts a different slant on it.

Which leads us to the primary reason people take vitamin E. Certainly one can hope that one will live longer, but the more compelling reason is that one will maintain good health throughout more of the life span.

Mixed Tocopherols

Finally, there are several forms of vitamin E, and I doubt if any of these studies used the most physiologic form of supplemental vitamin E, which is mixed tocopherols. Most vitamin E supplements are alpha-tocopherol, but evidence is mounting that the beta, delta, and gamma tocopherols are important as well. Higher doses of alpha-tocopherol could interfere with the absorption of the other forms of vitamin E. This could, in someone who is ill, lead to harm from deficiency of the beta, delta, and gamma forms.The interaction of different tocopherols is still unclear. To be on the safe side, we currently recommend mixed tocopherols to our patients. You can see our patient handout on vitamin E for more information.

Based upon my reading of the research, and my understanding of human metabolism, my bet is that time and further research will demonstrate that doses of mixed tocopherols in the range of 1000 I.U. per day will, for most adults, increase well-being and slow the deterioration of aging.

Mail Order Drugs — Proceed with Caution

Because the price of prescriptions has skyrocketed, many people are ordering mail order drugs through the Internet from Canada. If your drug is a generic, ordering from Canada will not be cheaper, but for brand-name pharmaceuticals Canadian prices are lower. There are, however, hazards in purchasing medicine over the Internet.

People have ordered drugs on the Internet from what looked like a Canadian pharmacy and received a package with a Thai stamp. Surveys of drugs coming from that part of the world indicate that 30 percent of the packages contain no active drug. What you're buying is just very professional looking packaging. In Nigeria it is worse; counterfeiters have replaced 60 percent of the pharmaceuticals in that country with inactive substances. Wags may argue that is a good thing, but if you want the active pharmaceutical, you need to be careful.

If you have any doubts about ordering drugs online, you can go to the Washington State Consumer Resources Website for help in finding a reliable Canadian drug connection.



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Medicine for People! is published by Douwe Rienstra, MD at Port Townsend, Washington.