Side Effects of Red Wine Extract

Excessive alcohol consumption is associated with an increased risk in a number of health complications including high blood pressure, and heart and liver disease. However, when alcohol is consumed in moderation, especially red wine, there may be some health-related protective benefits. Red wine extracts, which are primarily composed of the powerful antioxidant resveratrol, are currently being marketed as heart-healthy supplements. While there is some scientific evidence that supports the benefits of resveratrol, there are also reports of potential side effects associated with resveratrol supplements.

Three women clink glasses as they drink red wine. (Image: Christopher Robbins/Photodisc/Getty Images)

Blood Thinner

While there are significant studies reporting the positive benefits of resveratrol and red wine extract, there are relatively few that document the potential negative side effects. According to the Linus Pauling Institute at Oregon State University, resveratrol has not been linked to any toxic or serious side effects in humans; however, the availability of clinical research data is limited. One of the known properties of resveratrol is its anticoagulation effects, which means that it inhibits the coagulation property of blood platelets that are important for blood clotting. While the anticoagulation effects by themselves are not necessarily a threat, when taken with prescription blood thinners, they may actually increase the effects and put you at risk for excessive bleeding.

Drug Interactions

If you take medicine for high cholesterol, resveratrol supplements may interfere with the biochemical targets of these pharmaceutical agents. Most cholesterol-lowering drugs belong to a class of pharmaceuticals called statins, which are metabolized by the same enzymes in the liver as resveratrol. While there is no definitive clinical evidence that supports the antagonistic effects of statin medications and resveratrol supplements, it should be considered by you and your primary physician prior to starting the consumption of these particular dietary supplements.


While there is ample research that suggests there may be anti-cancer benefits associated with resveratrol, there is some room for concern that it may actually promote breast cancer. According to the Linus Pauling Institute at Oregon State University, competing research studies suggest that resveratrol acts as a both an agonist and an antagonist of specialized cell receptors called estrogen receptors. These opposing actions are linked to breast cancer prevention and breast cancer promotion. Due to these studies, caution should be observed when using red wine extract supplements for their purported health benefits.

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