NVE makes a popular weight loss supplement called Stacker, and within the Stacker fat burner line, there are various different products. There's stacker 2 and 3, and there are also different versions of these available as well. There's Stacker 2 ephedra free and an XPLC version. For Stacker3, there's a version with chitosan, and also an XPLC version. We will be reviewing both here.
Since there's a XPLC version of both Stacker 3 and 2, you may wonder what's the difference between them? Honestly, not a whole lot! Looking at the ingredient list carefully, you'll see that there really isn't any difference between these two versions. They contain basically the same ingredients, with the only major difference being that Stacker 3 XPLC appears to be a "Lite" version of Stacker 2 XPLC. The proprietary blend for stacker2, which contains all the active ingredients, is 255mg, compare that with 195mg for Stacker3. The only other difference here is that Stacker 3 contains 200mg caffeine compared to 150mg for Stacker2.
The key active ingredients in Stacker 3 XPLC are yohimbine, yerba mate, camellia sinensis, capsaicin, and caffeine. As stacker2 XPLC contains the same ingredients, we won't go into too much details about these ingredients here. You can read about it all in our Stacker 2 review here. The key ingredients in this XPLC formula are capsaicin, camellia sinensis (tea), and caffeine. Studies have found the combination of these 3 ingredients to produce weight loss results - energy intake is reduced, hunger is suppressed, and energy expenditure is increased. Please do read about all this in more detail in our other article to gain a better understanding.
The Stacker 3 fat burner is another diet pill made by NVE. The major difference here is that it also contains Chitosan. Other than that, there's some just very minor ingredient differences when you compare it to Stacker 2 ephedra free version. The ingredients contained in this are: kola nut, cactus extract, white willow bark, grapefruit extract, chitosan, caffeine, green tea, guarana, and garcinia.
Kola nut, green tea, and guarana are all different sources of caffeine. Aside from that, Stacker 3 also contains an additional 250mg of caffeine anhydrous. So you're probably getting close to 3 cups coffee in caffeine content. White willow bark produces an active ingredient called salicin, of which there is a derivative made called aspirin. However, there's little to no benefits of aspirin for weight loss, other than the claim that it may help enhance the efficacy of other thermogenic ingredients. Garcinia is a plant family that contains a sub species called Garcinia Cambogia that has been used in various weight loss formulas for its purported weight loss, and appetite suppressing effects. However, there does not appear to be much evidence to support this currently.
The one other ingredient that they make a big deal about in Stacker 3 is Chitosan, as though it's some supplement that will do wonders for your weight loss results. Unfortunately, all evidence points to the other direction. Chitosan is derived from the shell of crustaceans, and there are claims that Chitosan can block the fats and lead to weight loss results. However, we have done extensive research on this subject, and have reviewed many different scientific studies dealing with Chitosan and its effects on human subjects. Numerous large scale scientific studies have been conducted with human subjects, and most of them have provided no support for using Chitosan as an effective weight loss supplement. So the inclusion of Chitosan as an ingredient of Stacker 3 would appear to have little to no real benefits for losing weight.
Having similar formulations as Stacker2, Stacker 3 fat burners also comes with various potential side effects, and some of these include faster heart rate, higher blood pressure, headaches, dizziness, nausea, nervousness, sleeping problems, and jitteriness.
Considering all the different versions of Stacker fat burners available, I think that the Stacker 2 and Stacker 2 XPLC versions may provide users with better results. Stacker 3 XPLC appears to be a lite version while the chitosan in Stacker 3 provides no real benefits for losing weight. For these reasons, we lean towards the Stacker 2 fat burners.