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I don't think niacin turns your piss yellow...I think it dilutes more than it concentrates your piss. If you want your piss to look yellow/not be diluted, you need to either take a b vitamin or centrum or some creatine - cause thats what they measure to see whether or not it's dilute. Eat a meal with red meat the night before the test (cause it has lots of creatine) and maybe take a centrum the day of along with niacin the days before and day of.
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