@anamur-- I believe it's a 'weight loss supplement.' So it is a supplement that helps reduce weight. I also heard about this on TV, I think it was on Dr. Oz Show. It's supposed to increase the amount of leptin in the body which is what tells our brain that we are full. So if you take mango seed extract regularly, you should feel less hungry and that will help with the weight.
My sister-in-law is trying it right now and she says it works. But she did a lot of research to find the right supplement that's made by a proven manufacturer. She said that there were some online that didn't look very trustworthy.
I think it's worth trying if you get a quality one without chemical additives and also check with your doctor first.