The chances are, at some stage in your life, you may have heard about Stacker Fat Burners, but have you ever wondered what they actually are, or even how they work?

Manufactured by NVE Pharmaceuticals, the original product was called Stacker 2. As with all products, Stacker Fat Burners have also inevitably evolved into what is known today as Stacker 4 Fat Burners. One of the most noticeable changes between the original Stacker 2 and the present day Stacker 4 is the absence of Ephedra. As with all previous Stacker Fat Burners, Stacker 4 utilizes an effective combination of ingredients to help you lose weight without compromising muscle mass.

All the ingredients in Stacker Fat Burners are dependent on each other in order to achieve the desired results. The first stage of the stack works to increase energy levels while at the same time reducing your appetite. The next stage of the stacker 4 increases metabolism, causing the body to burn fat in its quest to create energy. Additionally, Fat Burners also work to remove excess body fat.

While Stackers can have some side effects, the vast majority of people don't experience any and predominantly, report positive results. It is also worth noting that Stackers products containing Ephedra are more likely to cause side effects than the Stacker products that are Ephedra free. Possible side effects of Stacker 4 Fat Burners include increased heartbeat and/or blood pressure and on extremely rare occasions, dizziness, or light-headedness. Of those people who do suffer some side effects, many continue taking Stackers as they feel the side effects are minimal and are outweighed by the overall benefits.

In general, Stacker 4 Fat Burners are completely safe to use. However, as with all such products, one should follow the instructions provided and never exceed the recommended dose. People who have, or who are at risk of any of the following, should consult a physician prior to taking Fat Burners: - heart disease, stroke, high blood pressure, thyroid disease, kidney disease, liver disease, ulcer, diabetes, recurrent headaches, caffeine sensitivity, anxiety, depression, glaucoma, prostate enlargement or seizure disorders. If you are pregnant, nursing or taking another dietary supplement, you should also avoid Fat Burners.

Stacker 4 Fat Burners are a blend of powerful natural herbs, all standardized for the active ingredients. These include green tea extract, yerba mate, guarana, capsicum, kola nut, and ginseng.