Why is the default vitamin E intake set at 15mg daily?

Is this not a highly excessive intake?

According to the NHS (https://www.nhs.uk/conditions/vitamins-and-minerals/vitamin-e/) the amount needed for males is 4mg daily for males, not 15mg. Perhaps the oral bioavailability of Alpha-Tocopherol being low so high oral dose is needed to compensate? I can not find any answers looking through research myself.

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