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CircO2 v/s Nitric Oxide Flow Review: Which Is The Best?

Cardiovascular health is hard to maintain due to stress, poor nutrition, and lack of exercise, which can lower nitric oxide (NO) levels essential for blood flow and heart function. Low NO levels can cause hypertension and decreased endurance.

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Let's explore two popular nitric oxide-boosting supplements: CircO2 and Nitric Oxide Flow. Both aim to enhance nitric oxide production to address cardiovascular concerns. We will focus on their components, uses, and effectiveness.

This article will evaluate them based on their ingredients, promises, and user feedback, helping you decide which is most suitable for you. By comparing CircO2’s natural formulation with Nitric Oxide Flow’s targeted approach, you'll have the information needed to make the right choice for your cardiovascular health.

What is CircO2?

CircO2 is a supplement that boosts nitric oxide production, essential for muscle health. It uses a mix of ingredients to address the age-related decline in nitric oxide levels.

Using an innovative absorption method, CircO2 dissolves in the mouth, allowing direct interaction with oral bacteria to convert its ingredients to nitric oxide. This can improve vitality, sleep, joint pain, cognitive function, and overall well-being.

CircO2 offers immediate health benefits, making it a valuable addition to daily routines. It is highly recommended for those aiming to maintain well-being as they age. Manufactured to high standards, CircO2 ensures efficacy and peace of mind, making it an excellent choice for supporting vascular health and overall well-being.

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What is Nitric Oxide Flow?

Nitric Oxide Flow is a supplement that boosts nitric oxide production, essential for cardiovascular health. It contains special ingredients that enhance blood flow and energy levels. 

This capsule dilates blood vessels, improves circulation, promotes healthier blood pressure, better athletic performance, and quicker recovery.

Offering immediate health benefits, it's a valuable addition to daily routines for heart health. Made to high standards, Nitric Oxide Flow ensures efficacy and peace of mind, making it an excellent choice for vascular health.

Key Ingredients of CircO2

Beetroot Powder

High in nitrates, it converts to nitric oxide, increases blood flow and oxygen delivery, enhancing energy and exercise performance.


Better absorbed than L-arginine, it boosts nitric oxide levels, enhancing blood circulation and reducing muscle fatigue.


Supports heart health, protects endothelial cells, promotes healthy aging, and maintains optimal blood pressure and cholesterol.

Vitamin B12

Essential for red blood cell production and brain health, it aids nitric oxide production, supporting overall well-being and cognitive function.

Vitamin C

Boosts immunity, supports nitric oxide production, and promotes endothelial health, ensuring efficient blood circulation and cardiovascular support.

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Key Ingredients of Nitric Oxide Flow


Found in nuts, meats, and corn, L-Arginine dilates blood vessels and boosts nitric oxide, supporting cardiovascular health.


Present in watermelon, this amino acid enhances blood flow during physical activity and supports endurance and performance.

L-Arginine HCI

Found in fish, L-Arginine HCI helps maintain normal blood pressure by dilating blood vessels and improving circulation.

L-Citrulline Malate

Also from watermelon, this amino acid improves blood flow during exercise and helps maintain healthy blood pressure.

How The Supplements Works?


CircO2 is a powerful supplement that has a great effect on the health of every blood vessel’s wall especially the layer known as endothelium. This layer controls blood and oxygen supply and nutrients as well as the removal of waste matter in the body. As one age, the endothelium loses its efficiency and decreases blood circulation, leading to health problems.

CircO2 boosts nitric oxide production, relaxing the endothelium and widening blood vessels. This improves blood flow, increasing oxygen and nutrient supply throughout the body. CircO2 increases circulation since it helps in the regulation of nitric oxide and helps in the proper functioning of endothelial cells.

Advantages include; vigor, improved sleep, decrease in joint pains, and improved brainpower. CircO2’s normal usage sustains nitric oxide levels and assists vascular function, thus the overall health and wellness in the longer term.

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Nitric Oxide Flow

Nitric Oxide Flow increases your body’s capacity to generate nitric oxide which is important for the health of your blood vessels. L-Arginine and L-Citrulline substances go into your blood stream making nitric oxide increase. This is a vasodilating agent that causes the expansion of blood vessels to allow for better blood flow. Increased circulation means increased blood oxygen and nutrients in muscles and organs.

It helps lower blood pressure, boost energy, and improve heart health. Better blood nutrient and oxygen supply facilitates more rapid healing and endurance during tasks. Antioxidants help the body to fight the effects of oxidation or free radicals thus supporting healthy cell division and the wellbeing of body cells. So, if you are an athlete looking for a supplement to improve your ability or anyone in need of better heart health, Nitric Oxide Flow is the way to go.

Benefits of CircO2

  • Improved Blood Pressure: CircO2 helps maintain healthy blood pressure levels by promoting nitric oxide production, which relaxes and dilates blood vessels.

  • Increased Energy Levels: Enhanced circulation and better oxygen delivery boost energy and stamina, supporting active engagement in daily activities.

  • Enhanced Sleep Quality: With better blood flow, CircO2 aids in regulating sleep cycles, contributing to more restful nights.

  • Joint Health Support: The supplement helps reduce inflammation around joints, relieving pain and improving mobility, beneficial for conditions like arthritis.

  • Sharper Cognitive Functions: Improved blood flow ensures better oxygen and nutrient delivery to the brain, which enhances memory, focus, and problem-solving skills.

  • Cardiovascular Health: By maintaining the flexibility of arteries, CircO2 reduces the risk of blockages and supports efficient blood circulation, nurturing heart health.

Benefits of Nitric Oxide Flow

  • Supports Healthy Blood Pressure: By increasing nitric oxide production, this supplement aids in maintaining normal blood pressure levels.

  • Boosts Energy: Improved circulation allows for better delivery of nutrients and oxygen, resulting in increased energy levels and stamina.

  • Accelerates Recovery: Enhanced blood flow ensures that muscles and tissues receive essential nutrients faster, aiding in quicker recovery post-exercise.

  • Natural Ingredients: Contains L-Arginine and L-Citrulline, which are naturally occurring amino acids that support nitric oxide production.

  • Improves Athletic Performance: By increasing oxygen delivery to muscles, this supplement helps boost efficiency, tolerance, and endurance during physical activities.

  • Supports Cellular Health: Antioxidant properties help in reducing oxidative stress, promoting healthy cellular regeneration.

Side Effects of CircO2

  • Digestive Issues: Users might experience mild discomfort, like nausea or diarrhea, especially when starting the supplement. Taking it with food can help.

  • Headaches: Higher nitric oxide levels may cause headaches in some due to vasodilation effects.

Side Effects of Nitric Oxide Flow

  • Possible Headaches: Some users may experience mild to moderate headaches, especially during the initial days of supplementation.

  • Dizziness: Instances of dizziness can occur due to changes in blood pressure as the body adjusts to increased nitric oxide levels.

  • Nausea: A few individuals might feel nauseous, particularly if the capsules are taken on an empty stomach.

  • Stomach Discomfort: Mild stomach upset or discomfort may be encountered as the body adapts to the ingredients.

  • Allergic Reactions: Rarely, an allergic reaction may occur. Symptoms can include rash, itching, or swelling, particularly of the face, tongue, or throat.

  • Low Blood Pressure: Considering the product's role in enhancing blood flow and lowering blood pressure, users with already low blood pressure should exercise caution.

  • Interaction with Medications: Potential interactions with other medications, especially those for heart conditions or blood pressure, should be discussed with a healthcare provider.

Real Customer Testimonials


“I have to say that after letting this good tasting tab melt in my tongue, within about 10 minutes I can feel the effects. I have more energy and feel very alert.”  

  •  Michael H.

“I take it every day … you can begin to see results immediately.” 

  •  Robert J.

“Energy is all the way UP … I felt the difference after 15 minutes of taking it.” 

  •  Tifiro C.

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Nitric Oxide Flow

“It dropped my blood pressure down to excellent numbers. I am happy with the results.” 

  •  Ian Anderson

“Both my wife and I have been taking Nitric Oxide Flow for a few months, and we have noticed our blood pressure readings coming down into very normal ranges. Very happy with this product!” 

  •  David B.

“take it everyday and gives me better blood flow and energy throughout the day.” 

  •  Michael V.


In conclusion, both CircO2 and Nitric Oxide Flow support cardiovascular health by boosting nitric oxide production. 

However, CircO2 stands out with its innovative delivery method and a blend of natural ingredients. Its unique absorption directly converts into nitric oxide, offering rapid benefits like improved blood pressure, increased energy, better sleep, joint health, and sharper cognitive functions. Users consistently praise its immediate energy boosts and clarity. High manufacturing standards ensure CircO2's quality and effectiveness, making it a reliable choice for better cardiovascular health and overall well-being.

Nitric Oxide Flow uses L-Arginine and L-Citrulline to improve blood flow and cardiovascular health. It helps maintain healthy blood pressure and boosts energy but may not have the same instant impact as CircO2. It's a solid choice for those seeking a straightforward nitric oxide supplement, especially for athletic performance and quicker recovery.

For those wanting a holistic and quickly effective supplement to boost cardiovascular health and overall well-being, CircO2 is the superior option. Its innovative formulation and immediate benefits are unmatched, making it ideal for maintaining vitality and health as you age.


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