Some basic supplements such as multi-vitamins, essential fatty acids (EFA's) or protein powders are helpful from a "nutritional insurance" standpoint, and some are great for convenience.

However, supplements such as fat burners are not necessary.

Many which are advertised as "breakthroughs" have no scientific support behind them whatsoever.

Even supplements that have been scientifically proven to have some benefit are only responsible for a small fraction of the results you achieve, when it comes to improving your body composition (losing fat and or gaining muscle).