Re: "amps up the immune system and detoxifies the liver”,
Not entirely woo. Part of the hangover experience is simple dehydration - putting saline into the blood will fix that, plus it reduces the concentration of toxins by simple dilution. It's one of the few hangover cures that will actually cure the hangover.
The vitamin stuff is woo though. Most vitamin supplements are, oral or IV - there are a some exceptions, but the vast majority of people get what they need in their food and adding more gives no benefit. It could at least be considered forgiveable woo as, unlike most woo, it does have a plausible mechanism of action.
Biting the hand that feeds IT
