Vitamin E comes in several strengths, but the most commonly made (and used) strengths are 400 IU and 1000 IU. No matter what form of vitamin E, 400 IU definitely exceeds the RDA. Since some studies have suggested that taking more than 400 IU of vitamin E a day may increase the risk of death (from all causes combined), it is usually recommended that vitamin E dosages not exceed 400 IU per day.
If you are concerned about meeting the recommended dietary requirements, a simple multivitamin will provide enough vitamin E (usually 30 IU). If you are interested in higher doses for other purposes, it is best to use 400 IU or less.
Please do also speak to a doc/pharmacist for more details, take care.
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