Two main culprits β alcohol and dehydration, usually cause a hangover headache. Drinking alcohol can cause your blood vessels to dilate, which in turn may cause your headache. Also, your body is often dehydrated after a night of consuming several alcoholic beverages. Alcohol can cause you to urinate more, depleting your system, especially if youβre not drinking enough water or replenishing with electrolytes. The Hangover IV will help with both of these culprits, and youβll start to feel relief almost immediately. Β
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