Losing Weight? Do Supplements Help?

I am really trying to lose weight. I have been looking at different products to try, but who knows what's the best to use. Is it a fat burner or a product to speed up your metabolism. Should I take a protein blocker or a carb blocker? What's safe to take and what isn't. Would it be better to take vitamins? Is there an answer? I don't know but, ALL help is appreciated!