Best multivitamin/pack for weight loss?

Anyone have any recommendations for a good Multivitamin/Pack for weightless? I used to use the typical GNC Mega Man's but started to hear how they are very generic, now with going to the gym religiously I was think there must be something out there more beneficial and more helpful along the lines of weight loss. I've been looking at the Animal Stack Cuts Pak but i'm not really to sure what to decide on. Anyways, any thoughts? Opinions?