After twenty years of hearing "what is the best weight loss, fat burning product" which is not a easy question to answer, I decided to add this information.  Not every product is for every person. Their is no such thing as "the best weight loss product," because each person stored fat and burns differently. The category of fat burned can be divided into two areas; lipotropic products and thermogenic products. In the simplest of terms, lipotropics are any products or ingredients that have the ability to dissolve and metabolize fats. In essence, they emulsify stored fats and dump them into the blood stream to make them more available for the body to use as an energy source. Thermogenics refers to the creation of heat to increase metabolism and burn fat. Thermognic products usually raise the body temperature by about one degree, increasing the metabolism to burn fat more effectively and act as an overall energizer. They may also have the side effect of depressing the appetite. How these two categories work depends on the goal of the consumer. In the body, calories are used in three basic ways. First, energy is required for everyday functions like breathing, digestion and other process that keep the body alive, and calories are consequently burned even during sleep. Second, calories are used during the body’s process of thermogenesis, which manifests during exercise and activity. Third, calories that are not used during the basic functions required to keep the body alive or through activity are stored as fat. Simple enough, but it does get a little trickier. Brown adipose tissue, or BAT, is a type of fat that’s technically classified as a gland. Genetic or environmental factors--like aging, having a baby, or a genetic tendency toward obesity--can cause BAT to slow down or become dormant. While lipotropic products can mobilize stored fat and move it into the blood stream, if BAT isn’t activated, fat will either remain in the blood stream or go back into fat cells. With that in mind, manufacturers of fat burner products use variety of specific ingredients that both mobilize stored fat and then help to get it out of the body. Some of the most widely used ingredients include the following:

A reasonable amount of research backs up many of these ingredients. Pyruvate, for example, has been shown in university studies to increase overall fat loss in dieters by 37 percent by increasing metabolism and fat utilization. A study at the University of Copenhagen determined that in an exact ratio, aspirin, caffeine and ephedra created a potent fat-burning compound. The combination of ephedra, caffeine and aspirin was shown to have a marked effect on overall weight loss over eight weeks, with sustained weight loss over the next five months without restriction of calories as reported in the International Journal of Obesity (1993). In spite of the research that were done on these ingredients, some company will use this research to sell their products. With claims of large amounts of weight loss, using their products. My rules have and always will be that fat-burning supplements are just that; Supplements. They should be used in conjunction with an appropriate diet and exercise regimen. "None of these, and I truly mean none, will in and of themselves burn fat," "They’re all designed to support the body with nutrients that can assist metabolism and make exercise sessions more beneficial"  Research

Fat burner automatically get classified as weight loss products, but they’re not technically weight loss products. In the process of losing fat, you may actually gain weight, since fat is lighter than muscle. Ever though body fat percentages may go down, the numbers on the scales may go up. Additionally, many fat burners are directed more at the physically oriented. Fat burners are for those who are not concern with weight loss but for those who are concern with building muscle and firming and toning.  As with all categories in the weight loss market, this segment is flooded with tends. A number of hot new ingredients are on the fat-burner scene. These include various herbal alternatives to Fen-Phen that generally use stimulants or some similar constituent to boost metabolism and St. John’s Wort to take the edge off. These new alternatives are no different than the old weight loss products on the market. St. John’s Wort was added with the concept that people overeat because of depression. Other contenders in the new ingredients market include Chitosan, a nutrient that helps prevent the body from absorbing fats from food. So in most cases people will believe they can eat more fatty food as long as they take a couple of chitosan before eating. Garcinia Cambogia or Hydroxcitric Acid (HCA), which dramatic effect at the cellular level in accelerating fat burning and inhibiting fatty acid synthesis. Gymnema Sylvestre, the common name, "gurmar", means sugar destroyer and is also known as the sugar blocker. Citrus aurantium , also known as zhi shi or synephrine, is of the same chemical family as ephedra (now Banned) but is milder in its actions. It helps to control appetite, stimulate metabolism, increase energy, and regulate the absorption of calories in much the same way as caffeine without the "physical high". So most people using these products can believe that since they are eating less food, they can eat that candy bar, donuts or chocolate cake. None of these products will work without changes in exercise and diet. You can’t pop a pill, sit on the couch, have a half a box of bon bons and expect to lose pounds. 

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