There are no side effects of taking vitamin E in moderation, but if vitamin E supplementation is excessive it can cause side effects. First, excessive supplementation of vitamin E can easily cause thrombotic inflammation or embolism in human veins, mainly due to platelet aggregation caused by high doses of vitamin E supplementation in humans. Secondly, excessive supplementation of vitamin E can also lead to disruption of human hormone metabolism and a decrease in prothrombin, which can easily cause certain adverse cardiovascular diseases in humans. In addition, if vitamin E is used together with aspirin, it will reduce the viscosity of human blood, and some people with weaker bodies will experience dizziness, blurred vision, muscle weakness, muscle weakness, nausea and other adverse symptoms. This shows that improper supplementation of vitamin E can induce many undesirable side effects, so it is necessary to adopt the right attitude towards taking it.