Anyone try raspberry keytones to assist in wl?

Heard of these from friends that say its a natural way to help burn fat.  Working super well for them.  My question is, anyone in the wls community ever use them?  I had the RNY in 2003, and have gained back a large portion of my weight.  I will talk with my dr. soon to see what she has to say about it, but just wondering in the meantime...wondering about bowel issues, digestion & absorbtion, etc.  Anyone?  Thanks:-)

I tried the raspberry keytones and had HORRIFIC heartburn from taking it. I tried taking a little less,still had horrific heartburn. I also tried the green coffee bean ...... Didnt work. Neither worked.... At all.... Just a complete waste of a lot of money!