drink lots of water get 100-250 milligrams of vitamin B. Many vitamins will work, but B-2 or B-12 (found in B-complex vitamins) if they time release crush them and consume the powder piss all you want all this does is dilute your samples and keep them yellow. Don't recall the window of oppurtunity if you got the time test yourself once or twice the days leading up to it you can buy a home test kit to test yourself at any pharmacy. It's worked for me good luck :thumbsup: