All weight loss supplements claim to help you lose weight quickly and easily. Unfortunately, many of these supplements don't work. NitriLEAN claims to be different. The company discloses its full list of ingredients and dosages upfront, making it easy to verify the supplement's effects based on scientific research and studies.

Here are all the ingredients in NitriLEAN and how they work, according to the official website:

• Green Tea Extract (500mg)
• The main ingredient in NitriLEAN is green tea extract. There is twice as much green tea extract in NitriLEAN as in any other ingredient. Each serving contains 500mg of green tea extract standardized to contain 50% epigallocatechin gallate (EGCG), the active ingredient in green tea. EGCG is linked to antioxidant effects and fat burning. According to the makers of NitriLEAN, the green tea in their formula works as a "powerful metabolism booster and natural antioxidant," helping to boost your metabolism and force your body to burn fat for energy, among other benefits.
• L-Citrulline (220mg)
  
• NitriLEAN contains 200mg of L-citrulline, a powerful amino acid found in many pre-workout formulas for its effects on nitric oxide production. By supporting the production of nitric oxide in your body, NitriLEAN can purportedly widen blood vessels, increasing pump and vascularity before a workout. In NitriLEAN, these same effects increase blood flow throughout the body, increasing energy and facilitating weight loss.
• Hawthorn (100mg)
  
• NitriLEAN contains 100 mg of hawthorn extract. The company added this ingredient specifically for heart health, claiming that the ingredient "has been shown to support a healthy heart." They also claim to use an “ultra rare and pure hawthorn extract that can help support your health and fitness goals.
• Beet Root (100mg)
  
• NitriLEAN contains 100 mg of beetroot extract to support nitric oxide levels, blood pressure, blood sugar, circulation and sexual performance, among other benefits. Many people take beets every day for blood flow. The makers of NitriLEAN claim to use "the purest naturally sourced beetroot available", maximizing the blood flow effects of NitriLEAN.
• Garcinia Cambogia (100mg)
  
• Garcinia cambogia has been one of the trendiest diet pill ingredients of the last decade. According to the makers of NitriLEAN, garcinia cambogia can inhibit enzymes involved in fat production while increasing metabolism and energy. The company also claims that its garcinia cambogia can support healthy appetite and cholesterol levels, support blood sugar and insulin response, and provide other benefits.
• Cayenne pepper (50 mg)
  
• NitriLEAN contains 50 mg of cayenne pepper extract. Many diet pills use cayenne pepper extract due to the strong presence of capsaicin, the natural ingredient that gives peppers their spice. This ingredient has been shown to help burn fat thermogenics, making it easier to lose weight by burning fat from the inside out.
• Grape Seed Extract (50mg)
  
• NitriLEAN contains 50 mg grape seed extract. Grape Seed Extract is rich in polyphenols, which are natural fruit chemicals with antioxidant effects. According to the makers of NitriLEAN, the grape seed extract in their formula can "significantly support" blood flow and cardiovascular health.
• Bioperine (5mg)
  
• Like many diet pills sold online today, NitriLEAN contains a small dose of black pepper extract in the form of Bioperine. This extract has been shown to increase the absorption of other ingredients. Many garcinia cambogia diet pills, for example, contain Bioperine for its effects on bioavailability. According to the makers of NitriLEAN, the Bioperine in their formula "works to significantly improve the bioavailability of all other nutrients," leading to better absorption and efficacy.