Vitamin Shots for Weight Loss

I have a friend in Canada and in discussion I found out she's on a diet plan that includes high dose shots of vitamin b that they don't have here. I'm not really sure what to think of this because we all know, everything in moderation is better and practical judgment says to me that there may be adverse effects of taking so much. She's been able to keep off about 25 lbs that she lost in around a month so far. It sounds great but I have to wonder what the side effects are.

When you have a lot of weight to lose, what do you do? Do you have surgery? Exercise like it's going out of style? I'm one that ends up trying different pills to help jump start things. Since I'm good at being able to keep weight off pretty well it's helpful to have something give me a boost. Recently I read a phenphedrine review which made me want to dig deeper and it seems that a lot of people have had a great deal of success with this one. I still have a lot of weight to go and knowing what's out there is really helpful.