Best fat burner?

[Roxie1201]

I've been weight training for over a year now, with cardio 3xs a week.. Before then, I used to just do heavy cardio 6 days a week.. Am at about 19-20% BF but have a couple of very stubborn areas where the fat just won't melt!!! HELP
35 yrs old
140 lbs
19-20% BF
Just need to loose the extra fat to define my muscles... Have done it naturally up to this point.. But just need a little bump... ☺