Feeling tired, sluggish, or less energetic with age can be frustrating. For many adults, especially after 40, 50, or 60, the issue is not always just “getting older.” Sometimes the body may not be moving oxygen and nutrients as efficiently as before.
That is where nitric oxide comes in.
CircO2 is a nitric oxide supplement from Advanced Bionutritionals. It is marketed for blood flow, circulation, energy, stamina, healthy blood pressure support, memory, and healthy aging. Unlike many supplements that come as capsules, CircO2 is a fast-dissolving lozenge designed to dissolve in the mouth.
But is CircO2 really worth trying, or is it another overhyped supplement?
In this review, we will look at what CircO2 is, how it works, its ingredients, possible benefits, side effects, price, and who may benefit most.
Table of Contents
What Is CircO2?
CircO2 is a dietary supplement designed to support the body’s natural production of nitric oxide.
Nitric oxide is a molecule your body makes naturally. It helps blood vessels relax and widen, which may support better blood flow, oxygen delivery, circulation, and exercise performance.
The CircO2 sales page describes nitric oxide as important for keeping blood vessels open, oxygen flowing, and the brain working properly. The product is promoted for adults who want support for energy, stamina, circulation, blood pressure, memory, and overall vitality. (Advanced Bionutritionals)
CircO2 is not sold as a regular capsule. It comes in lozenge form, meaning you place it in your mouth and let it dissolve.
That is one of the main selling points of this product.
How Does CircO2 Work?
Nitric oxide is a molecule your body makes naturally. It helps blood vessels relax and widen, which may support better blood flow, oxygen delivery, circulation, and exercise performance.
As highlighted in this Nitric Oxide CircO2 Review, the CircO2 sales page describes nitric oxide as important for keeping blood vessels open, oxygen flowing, and the brain working properly. The product is promoted for adults who want support for energy, stamina, circulation, blood pressure, memory, and overall vitality. (Advanced Bionutritionals)
CircO2 is not sold as a regular capsule. It comes in lozenge form, meaning you place it in your mouth and let it dissolve.
That is one of the main selling points of this product, often mentioned in any detailed CircO2 Supplement Review.
How Does CircO2 Work?
In this Nitric Oxide CircO2 Review, CircO2 is based on the idea that nitric oxide production starts partly in the mouth.
The product page says bacteria on the tongue help convert nitrates into nitric oxide. Because of that, Advanced Bionutritionals claims a lozenge may be more effective than a standard pill or capsule that goes directly to the stomach. (Advanced Bionutritionals)
In simple words:
CircO2 is designed to dissolve in the mouth so its ingredients can interact with the oral pathway involved in nitric oxide production.
The company claims this method raised nitric oxide levels by 200% within 20 minutes and increased blood flow by 34% in clinical testing. (Advanced Bionutritionals)
Important note: These are the company’s claims from its sales page. As discussed in this CircO2 Supplement Review, it is better to present them carefully instead of promising that every user will get the same result.
Why Nitric Oxide Matters
As explained in this Nitric Oxide CircO2 Review, nitric oxide plays an important role in vascular health. It helps blood vessels relax, which may support healthy circulation and oxygen delivery.
Healthy nitric oxide levels may be connected with:
Better blood flow
Exercise stamina
Circulation support
Healthy blood pressure support
Oxygen delivery
Energy and endurance
Sexual performance support
Brain and memory support
Nitric oxide naturally becomes a popular topic in heart health, men’s health, energy, and healthy aging content because circulation affects many areas of the body.
However, CircO2 is still a supplement. It should not be treated as a cure for high blood pressure, heart disease, poor circulation, erectile dysfunction, fatigue, or memory problems.
CircO2 Ingredients
According to this Nitric Oxide CircO2 Review, the CircO2 product page highlights several ingredients that are commonly used in nitric oxide and circulation supplements.
1. Beet Root Powder
Beetroot is naturally rich in nitrates. The body can convert dietary nitrates into nitric oxide.
This is why beetroot supplements are commonly marketed for blood flow, stamina, and exercise performance.
CircO2 uses beet root powder as one of its key nitric oxide-supporting ingredients. The company describes beet root as a nitrate-rich ingredient that may help open blood vessels, improve oxygen flow, and support stamina. (Advanced Bionutritionals)
2. Hawthorn Berry
Hawthorn berry is often associated with traditional heart-support formulas.
The CircO2 page describes hawthorn berry as an ingredient that may support nitric oxide absorption and heart health. (Advanced Bionutritionals)
This ingredient gives CircO2 a stronger heart-health angle compared with a basic beetroot-only supplement, as often noted in a CircO2 Supplement Review.
3. L-Citrulline
L-citrulline is an amino acid often used in nitric oxide supplements.
The body can convert L-citrulline into L-arginine, which then supports nitric oxide production. Many sports nutrition and blood flow supplements include L-citrulline because it is commonly used for circulation, pumps, and endurance.
The CircO2 page claims L-citrulline may convert to nitric oxide more effectively than L-arginine, especially for adults over 45. (Advanced Bionutritionals)
4. Vitamin B12
Vitamin B12 supports energy metabolism, nerve health, and red blood cell formation.
The CircO2 page says B12 is included for energy, nerve support, and nitric oxide production. (Advanced Bionutritionals)
This ingredient helps position CircO2 not only as a circulation supplement, but also as an energy and healthy aging product—something frequently highlighted in this Nitric Oxide CircO2 Review.
5. Vitamin C
Vitamin C is an antioxidant that supports immune health and helps protect cells from oxidative stress.
The CircO2 page says vitamin C helps support nitric oxide production and protects existing nitric oxide from oxidative damage. (Advanced Bionutritionals)
6. Magnesium
Magnesium is important for muscle function, nerve function, blood pressure regulation, and heart rhythm.
CircO2 includes magnesium in its nitric oxide and circulation-support blend. The product page describes magnesium as helping blood vessels relax, supporting heart rhythm, and supporting recovery. (Advanced Bionutritionals)
Potential Benefits of CircO2
1. May Support Blood Flow and Circulation
The main reason people look at nitric oxide supplements is blood flow.
Nitric oxide helps blood vessels relax, which may support circulation. CircO2 is marketed directly toward people concerned about cold hands and feet, blood pressure concerns, lower stamina, and reduced oxygen delivery.
This makes CircO2 a strong fit for a Heart Health review article.
2. May Support Healthy Blood Pressure
CircO2 is marketed for healthy blood pressure support. The product page includes customer testimonials related to blood pressure changes and says the formula may help blood vessels relax and improve blood flow. (Advanced Bionutritionals)
However, this must be handled carefully.
CircO2 is not a blood pressure medication. Anyone with high blood pressure, low blood pressure, heart disease, or anyone taking blood pressure medication should speak with a doctor before using nitric oxide supplements.
3. May Help With Energy and Stamina
The company promotes CircO2 for renewed energy, stamina, and vitality. (Advanced Bionutritionals)
This claim makes sense from a marketing angle because better circulation may help oxygen and nutrients move through the body more efficiently. Beetroot and L-citrulline are also commonly used in fitness and endurance supplements.
Still, CircO2 is caffeine-free, so it should not feel like an energy drink. Its energy support is more related to blood flow and nutrient delivery, not stimulant effects.
4. May Support Exercise Performance
Because CircO2 includes beetroot and L-citrulline, it may appeal to people who want better workout stamina, endurance, or blood flow.
This does not mean it will automatically improve performance for everyone. Results depend on age, diet, fitness level, circulation, sleep, medication use, and overall health.
But for a healthy adult looking for nitric oxide support, CircO2 has ingredients that fit the exercise-performance category.
5. May Support Healthy Aging
The product page strongly targets older adults. It discusses nitric oxide decline with age and promotes CircO2 for energy, mobility, memory, circulation, and vitality. (Advanced Bionutritionals)
For VitalityNexus, this is a useful content angle:
“Can nitric oxide support better energy and circulation after 50?”
That topic can connect well with heart health, men’s health, healthy aging, and energy optimization.
6. May Support Men’s Performance
The product page also claims CircO2 may support intimacy and sexual performance through better blood flow. (Advanced Bionutritionals)
This is a common nitric oxide supplement angle, especially for men’s health. But it should not be written like a treatment for erectile dysfunction. A safe wording is:
CircO2 may support healthy blood flow, which is one factor involved in sexual performance.
CircO2 vs Regular Nitric Oxide Capsules
One of the main differences is the delivery format.
Many nitric oxide supplements come as capsules or powders. CircO2 comes as a lozenge that dissolves in the mouth.
The company argues that regular pills and capsules go directly to the stomach, while CircO2 supports the oral nitric oxide pathway by dissolving on the tongue. (Advanced Bionutritionals)
This makes CircO2 more unique than a basic beetroot capsule.
Simple comparison:
Regular capsule: Swallowed and digested in the stomach
CircO2 lozenge: Dissolves in the mouth and is designed to support nitric oxide production through the oral pathway
This is one of CircO2’s strongest selling points.
CircO2 vs Beetroot Powder
Beetroot powder is often cheaper and easier to find. It can support nitric oxide because it contains natural nitrates.
But CircO2 combines beetroot with other ingredients, including hawthorn berry, L-citrulline, B12, vitamin C, and magnesium.
So the difference is:
Beetroot powder: Simple nitrate source
CircO2: Multi-ingredient nitric oxide support formula in lozenge form
For someone who wants a basic budget option, beetroot powder may be enough.
For someone who wants a more complete nitric oxide formula, CircO2 may be more appealing.
Possible Side Effects of CircO2
CircO2 may be safe for many healthy adults, but side effects are still possible.
Possible side effects may include:
- Upset stomach
- Headache
- Dizziness
- Nausea
- Lower blood pressure
- Flushing
- Digestive changes
- Unusual changes in energy
Because CircO2 is designed to support blood vessel relaxation and blood flow, people with low blood pressure should consult a physician before taking it. The product page specifically mentions this caution. (Advanced Bionutritionals)
You should also speak with a healthcare professional before using CircO2 if you:
- Take blood pressure medication
- Take heart medication
- Use ED medication such as sildenafil or tadalafil
- Have heart disease
- Have kidney disease
- Have liver disease
- Are you pregnant or breastfeeding
- Have frequent dizziness or fainting
- Have been told to avoid nitrate-based supplements
This is especially important because combining circulation-support supplements with certain medications may lower blood pressure too much.
Who Should Consider CircO2?
CircO2 may be worth considering for:
- Adults over 40, 50, or 60 interested in nitric oxide support
- People looking for circulation and blood flow support
- People who want caffeine-free energy support
- Adults interested in stamina and healthy aging
- People who prefer lozenges instead of capsules
- Fitness-focused adults interested in beetroot and L-citrulline
- Men looking for blood flow support as part of a men’s health routine
CircO2 may be especially attractive to people who want a supplement that fits both heart health and energy support.
Who Should Avoid CircO2?
CircO2 may not be the right choice for everyone.
You may want to avoid it or speak with a doctor first if you:
- Have low blood pressure
- Take prescription blood pressure medication
- Take nitrate medications
- Take erectile dysfunction medication
- Have a serious heart condition
- Are you pregnant or breastfeeding
- Are under medical supervision for circulation problems
- Expect it to replace a healthy diet, exercise, or medication
CircO2 should not be used as a substitute for medical care.
Is CircO2 Legit?
CircO2 appears to be a real supplement from Advanced Bionutritionals, and the product page provides ingredient details, customer testimonials, a guarantee, and purchase options.
The formula also includes ingredients that are commonly associated with nitric oxide and circulation support, such as beetroot and L-citrulline.
However, the sales page uses strong marketing language. Claims like “nitric oxide levels jump 200% higher in just 20 minutes” should be treated as company claims, not guaranteed results for every user. (Advanced Bionutritionals)
A balanced review should say:
CircO2 may be a legitimate nitric oxide support supplement, but individual results can vary, and people with blood pressure or heart concerns should talk to a doctor first.
Is CircO2 Worth It?
CircO2 may be worth trying for people who want a nitric oxide supplement focused on blood flow, circulation, energy, stamina, and healthy aging.
Its strongest features are:
- Lozenge format
- Beetroot-based nitric oxide support
- Includes L-citrulline
- Includes heart and energy-supporting nutrients
- Caffeine-free energy angle
- Good fit for older adults and healthy aging content
However, it may not be necessary for everyone. If someone already eats a nitrate-rich diet, exercises regularly, has healthy blood pressure, and does not struggle with energy or circulation, they may not notice a major difference.
It is also more expensive than basic beetroot powder.
Final Words
CircO2 is best for adults who want a convenient nitric oxide lozenge for circulation, blood flow, stamina, and healthy aging support. It is not a cure for blood pressure or heart problems, but it may be a useful supplement for the right person when used safely.
FAQ
What is CircO2 used for?
CircO2 is used to support nitric oxide production, blood flow, circulation, energy, stamina, healthy blood pressure, and healthy aging.
Is CircO2 a blood pressure medicine?
No. CircO2 is a dietary supplement, not a medication. It should not be used to replace blood pressure medicine or medical treatment.
How does CircO2 work?
CircO2 is designed as a lozenge that dissolves in the mouth. The company says this supports the oral pathway involved in nitric oxide production.
What are the main ingredients in CircO2?
The product page highlights beet root powder, hawthorn berry, L-citrulline, vitamin B12, vitamin C, and magnesium.
Is CircO2 caffeine-free?
Yes, the product page says CircO2 does not contain caffeine or stimulant ingredients. (Advanced Bionutritionals)
Who should avoid CircO2?
People with low blood pressure, heart disease, or those taking blood pressure medication, nitrate medication, or ED medication should ask a healthcare professional before using CircO2.
How much does CircO2 cost?
The product page lists one box at $49.95, three boxes at $134.85, and six boxes at $249.00. Prices may change over time.
Is CircO2 good for men’s health?
CircO2 may fit men’s health content because nitric oxide is connected with blood flow, stamina, exercise performance, and sexual performance support. However, it should not be marketed as a treatment for erectile dysfunction.
References
- Advanced Bionutritionals — CircO2 product page, ingredient claims, nitric oxide claims, pricing, FAQ, and safety information. (Advanced Bionutritionals)
- National Institutes of Health Office of Dietary Supplements — Magnesium fact sheet for health professionals.
- National Institutes of Health Office of Dietary Supplements — Vitamin B12 fact sheet for health professionals.
- National Institutes of Health Office of Dietary Supplements — Vitamin C fact sheet for health professionals.
- Scientific literature on dietary nitrate, beetroot, nitric oxide, and exercise performance may be useful for supporting future updates to this review.