Weight Lose substances

Hey Guys
Just wanting to know if anyone on here has had good/bad experiences with weight lose substances, a female at my work is using one at the moment and has had great results, i took one of these this morning and still at this stage am not hungry so might be a good thing, any feeback would be great.
Just wanting to know if anyone on here has had good/bad experiences with weight lose substances, a female at my work is using one at the moment and has had great results, i took one of these this morning and still at this stage am not hungry so might be a good thing, any feeback would be great.