Triple-Action Nitric Oxide Boost with L-Arginine, L-Citrulline and more*

Blood vessel cells naturally contain enzymes that produce nitric oxide, an important signaling molecule for maintaining blood vessel tone. Fitness Labs Nitric Oxide Boost™ is designed to assist your body’s normal production of nitric oxide by supplying three dynamic support factors: L-Arginine, L-Citrulline and a special complex.* 

L-Arginine is a key nitric oxide precursor*

L-Arginine is a well known amino acid that has been a popular “pump” ingredient with bodybuilders and athletes for years. It is one of the main precursors in the body’s mechanism to produce nitric oxide.* (See Figure 1) 


L-Citrulline boosts L-Arginine to support nitric oxide levels*

L-Citrulline plays a significant role in the body’s production of nitric oxide. It is closely related to L-Arginine in structure, but L-Citrulline is digested and assimilated differently than L-Arginine.

Typically L-Arginine is extensively broken down by an enzyme called arginase during its journey through the GI tract and liver before reaching the blood. L-Citrulline, on the other hand, bypasses the liver after it is absorbed in the GI tract. Scientists believe this is why L-Citrulline has been shown to boost blood L-Arginine concentrations as well as, if not better than L-Arginine itself.* This is why we have twice the amount of L-Citrulline (2 grams) compared to L-Arginine (1 gram) in Fitness Labs Nitric Oxide Boost™.

According to recent research, using a combination of L-Arginine and L-Citrulline is even more effective than taking either L-Citrulline or L-Arginine alone. L-Citrulline is able to suppress arginase, the enzyme that breaks down L-Arginine. As a result, taking L-Citrulline with L-Arginine may help more of the ingested L-Arginine pass through your digestive system and get into the bloodstream.*


Special complex fights free radicals and supports nitric oxide*

We use a special complex with a precise blend of 29 gluten-free, non-GE fruit, vegetable and herbal ingredients designed to support the body’s response to five different free radicals. It works on peroxyl radicals, hydroxyl radicals, peroxynitrite, superoxide anion and singlet oxygen.*

A recent double-blind, crossover, placebo-controlled human study evaluated the effects of 100 mg of this complex taken with breakfast after an overnight fast. It demonstrated significant antioxidant action in healthy adults against reactive oxygen species (ROS), a category of free radicals.* 

This decrease in free radicals also resulted in increased bioavailable nitric oxide concentrations.* 


Try it today and help support your body’s production of nitric oxide*

In summary, Fitness Labs Nitric Oxide Boost™ combines the amino acids L-Citrulline and L-Arginine to help support nitric oxide production. The third support factor comes from the same dose of Spectra™ used in a human clinical study to help fight five major free radicals and support circulating nitric oxide levels.*


Directions: Take 4 capsules with a large glass of water 1-2 times daily. Take before workouts or between meals.

Support heart, muscle and circulation support with Fitness Labs Nitric Oxide Boost™!*


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