The only effective way to reduce your blood alcohol content (BAC) is:

To abstain from drinking over a period of time.
Fresh air.
By taking a cold shower.
By drinking coffee.
Explanation

To effectively reduce your Blood Alcohol Content (BAC), you must refrain from drinking over a period of time. Contrary to common misconceptions, coffee, cold showers or exercise cannot reduce your BAC or counteract the effects of alcohol. While they may help you stay awake, they will not sober you up.

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