L-carnitine. The best fat burner.
Yes. You read that correct. If you've read around my site you've been told to steer away from two things: sugar and caffeine. Like most pre-workout supplements, most companies jam a ton of caffeine into their fat burning products. Many pre-workout supplements are also tabbed as fat-burners for this common reason. However, too much caffeine no es bueno amigo. Fortunately, there are alternative fat burners out there that are safe, stimulant free and, yes, caffeine free.
There are also a few "fat-burners" that are highly marketed yet, there are no conclusive studies to suggest their effectiveness. Conjugated linoleic acid (CLA) is commonly marketed as a fat burner however, there are no convincing studies to suggest it as being effective. The same can be said about Johimbe or commonly written as "yohimbine". It is a tree bark extract that boosts adrenaline and is widely marketed as a weight loss ingredient. However, again, studies are inconclusive. Read a great article about it here. The same can be said about the use of Raspberry keytones in fat-burning products. Yet, there are no conclusive studies on this extract either.
L-carnitine is synthesized in the body from the amino acids lyseine and methionine. It can be supplemented in capsules and is a very effective natural and non-toxic agent in burning fat. Carnitine plays an essential role in transporting fat into mitochondira. This the "furnace" of the cell. It produces a thermogenic effect in the body. It is widely believed that supplementing with 3 g a day can significantly increase fat oxidation rates in your body.
Although L-carnitine is most effect when supplemented for its fat-burning properties, other benefits to the body include: increase in muscle mass, bone mass, benefits to the heart and kidney and many other benefits to body. The below article by Roger Lockridge of Bodybuilding.com provides a great break-down on how supplementing with L-carnitine provides a wide range of health benefits to the body.
Like the CreaPure product that I suggest in my creatine section, I also recommend supplementing with one carnitine product in particular. CarniPure is the highest quality L-carnitine product I know of. It is manufactured in Basel, Switzerland by Lonza Ltd. Their reputation for production and product quality is unsurpassed. The two products below feature it.