You mean like the diet industry that does billions selling products that don't work?
No, I don't mean like the diet industry... but since you mention it... it's not that diet products don't work,
...it's the people taking the products don't have the discipline required, are doing things that are counter-productive to their diets, and your country has lagged far behind the rest of the world in banning trans-fat as a food additive in commercial food production, ...and/or as well as the fact that the machine they are putting the diet product into (the human body) is constantly adjusting it's response to the calories it takes in. You starve yourself on a restricted diet, ...well it's not that the product you took was crap, ...it's simply that since you deprived your body of calories, your body adjusted it's rate of metabolism, to start storing more fat. Since one cannot remain on a restricted calorie diet forever, as soon as someone goes back to a normal intake of calories, ...more of those calories are stored as fat, rather than being burned for energy, because you have caused your body to lower it's metabolic rate in order to compensate for the restricted calories.
Beach, ...are you really a highschool dropout / college professor / bodybuilder as you claim?
I'm surprised you don't appear to know anything about simple metabolism?
The beauty about this product going into the engine, is that unlike the human body, the heat & pressure within the engine is consistent. There is no way this product cannot work. It is impossible for it not to work.
If someone uses it and doesn't get results, ...there is something preventing it from working, whether that be a fault in his engine, ...or water in the bottom of his diesel tank, an anti-syphon screen preventing the caplet from getting into the fuel, the caplet not dissolving because s/he used up all the fuel before it could dissolve, ...or someone simply not using the product properly. If used correctly, and dissolved in the fuel, it will work everytime, 100% of the time.