What bad for you, might be okay for me..what's okay for you, might be bad for me...
That's just a hard question. Many people take supplements but since they are "dietary supplements" they don't follow FDA rules (take that however you will).
I dont know any supplements that are OTC that would even "increase muscles"
Supplements in general do help but are not your main source of gaining or losing weight, they "supplement" your diet. For beginners I would stick to the basics of whey protein and creatine; I wouldn't buy anymore then that
Use google and find some legit reviews on supplements that you're looking into.