Vitamin E is an antioxidant that can scavenge free radicals in the body. Therefore, health food manufacturers promote vitamin E as a panacea for improving immunity, anti-cancer and anti-aging. Scientists have found through experiments that if the content of vitamin E in food is 5 micrograms per milliliter can significantly extend the lifespan of fruit flies, but if the content of vitamin E is increased to 25 micrograms per milliliter, the life span of fruit flies is shortened. In fact, free radicals in cells participate in many important life activities, such as cells Proliferation, intercellular communication, apoptosis, immune response, etc. which is incorrect from this inference? ['Free radicals have their unique effects and are indispensable to the body.', 'Scientists\' experiments on Drosophila reveal "before you go".', 'When the content of vitamin E exceeds 25 micrograms, it will endanger human life.', 'Vitamins are necessary to sustain human life, but they can also be life threatening when taken in excess.']