What are some good nutritional supplements I can take to increase/facilitate weight loss (when added to a good nutrition and fitness plan)

I need your personal experiences, please..I am considering getting some Acai Berry capsules…I haven’t read anything negative about this supplement and it’s full of anti-oxidants and it might help facilitate weight loss…I will not do diet pills or anything like HydroxyCut or Alli but are there natural supplements that you’ve tried that helped your weight loss? Also, this is in addition to a good nutrition and fitness plan so I am not depending on the supplement itself to lose weight