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As with vitamin C, B vitamin supplements are unlikely to provide any impact for the reason that if you are eating a reasonably healthy diet you are already getting all of them that you body can absorb. So if you're getting all your other vitamins from diet you should be good on the Bs too.
Excess just gets flushed out through your kidneys. So unless you have an absorption disorder requiring megadoses of B vitamins they likely aren't doing anything.
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