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I need to know about niacin!!! I have a drug test soon!

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I know people say it does and does not work so I need the truth if I fail this test im going to be in a lot of trouble. Does niacin work and if so I need to know people keep saying either the flush free kind or the regular kind I here they work both but one wont turn you like a lobster. Please let me know I have to pass this and since it is military they will be watching so this has to work do I need the flush free or the regular how do I get clean in TEN DAYS!!!