There is a myth that drinking vinegar will mask drugs; it won't. However, vinegar lowers the pH of urine. Amphetamines are excreted up to 3 times as fast when urine is acidified. So vinegar could reduce the detection time period for amphetamines. The effects on detection time are generally insignificant, and it in my opinion it really wouldn't be worth it to drink vinegar. If you do decide to drink vinegar, I hear it's easiest to get a shot glass and do it in shots. It will cause diarrhea.
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