>> reporter: going straight into her veins during the 45-minute long session, everything from vitamin c and b to minerals like zinc and chromium. >> they may be suffering from chronic fatigue. they just might be run down. i have patients with depression. and anxiety. >> reporter: at up to $275 a session, it's not cheap. and critics call it extreme. some question whether it actually offers anything nutrition food or traditional vitamins can't. but at patients medical in new york, doctors and patients swear by it. >> i.v. therapy is pretty much instant gratification. >> reporter: which may be why so many people now say they don't mind getting stuck for this vitamin fix. cecilia vega, abc news, los angeles. >> that's a lot of money. >> that's not cheap. people will do anything in this country to not simply eat right and go to the gym and get a good night's sleep. i.v. vitamins? >> 270 bucks and a needle in my arm? >> no thanks. probably doesn't want it either. >> fluffy doesn't like needles either. oh, let's hold him.