Irwin Naturals Green Tea Metabolizer Review

Editor's Review: 3.5 / 5.0

What You Should Know

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There is a common misconception in the world of weight loss. Some dieters believe all stimulants are weight loss ingredients. This is not the case. Some stimulants, like green tea and caffeine, have years of clinical research and backing proving the positive effects on weight loss. Other stimulants like bitter orange or Synephrine may increase heart rate but they will not increase metabolism. Irwin Naturals Green Tea Fat Metabolizer uses the green tea name to sell more supplements. While there is 400 mg of green tea per serving, there are other ingredients that increase the risk of side effects.

List of Ingredients

Chromium, Green Tea Extract, Advantra Z and Bioperine Complex: Ginger Extract, Piper Longum Extract and Bioperine Black Pepper Extract.

Product Features

Chromium is a fantastic ingredient for two reasons. One, it helps control blood glucose levels. High blood glucose is called diabetes. Being overweight or obese can increase the risk of diabetes so blood glucose control is important. The second reason chromium is fantastic is the natural appetite suppression that comes along with glucose control. Chromium helps dieters feel less hungry between meals because they do not feel the glucose crash common after eating.

Green tea extract gives Irwin Naturals Green Tea Metabolizer its name. There are 400 mg of green tea per serving; more than enough to boost metabolism. Advantra Z takes away the positive nature of the supplement Advantra Z is Synephrine. Synephrine is widely known as bitter orange or Ephedra’s cousin. While the effect of Synephrine is not as extreme as the Ephedra effect, it is strong enough to leave the dieter feeling jittery and nervous.

The remaining ingredients help the main three ingredients absorb more quickly. If the ingredients are not absorbed, the dieter will not see any benefits from the supplement. Bioperine is nothing more than black pepper extract.

Irwin Naturals Green Tea Metabolizer sells for $12 a bottle. This is much cheaper than other fat burners, but the ingredient list leaves much to be desired. Synephrine may cause severe stimulant side effects, which is not worth it when the two main ingredients, chromium and green tea are available over the counter and in other proven weight loss supplements without Synephrine.

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  • The complete ingredient list is available online.
  • Green tea is proven to boost metabolism.
  • Chromium may help control hunger.
  • Chromium will help control blood sugar levels.


  • Synephrine comes with a long list of potential side effects.


The Advantra Z used in Irwin Naturals Green Tea Metabolizer is not safe for most dieters. The stimulant increase heart rate and blood pressure; a dangerous combination. Dieters should look for a proven weight loss supplement without Synephrine.

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