Is CircO2 a scam or legit? That is a fair question to ask before spending money on any nitric oxide supplement. CircO2 is a real dietary supplement sold by Advanced Bionutritionals, but that does not automatically mean every marketing claim should be taken at face value. A closer look at the ingredients, evidence, pricing, guarantee, and buying process can help you decide whether it is worth considering.
Is CircO2 a Scam or Legit?
Based on the available product information, CircO2 is a legitimate commercial dietary supplement rather than a nonexistent or fake product. It is marketed and sold by Advanced Bionutritionals, and the company provides product information, Supplement Facts, directions for use, customer support, and a stated satisfaction guarantee.
The more important question is whether CircO2 is effective for you. That is different from asking whether the product itself is legitimate. A supplement can be a genuine product while still having limited evidence for some of the results advertised in its marketing.
There is a reasonable ingredient-based rationale behind CircO2, but individual results are not guaranteed, and marketing claims should not be confused with independent clinical proof.
What Is CircO2?
CircO2 is a quick-dissolve nitric oxide supplement designed to support the body’s nitric oxide pathways. Unlike many nitric oxide products that come as capsules or powders, CircO2 is provided as a lozenge that dissolves in the mouth.
The formula contains a combination of beetroot powder, hawthorn berry extract, L-citrulline, sodium nitrite, vitamin C, vitamin B12, and magnesium. The manufacturer describes the product as a way to support healthy nitric oxide production and circulation.
The company also explains that its lozenge format is intended to make use of processes involving saliva and oral bacteria. Oral bacteria are known to play a role in the conversion of dietary nitrate into nitrite, which is part of the body’s nitrate-nitrite-nitric oxide pathway.
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Who Makes CircO2?
CircO2 is manufactured and marketed by Advanced Bionutritionals. The company sells the product directly through its website and provides information about the ingredients, suggested use, ordering options, and satisfaction guarantee.
This matters when evaluating whether a supplement is legitimate. A product with an identifiable manufacturer, published ingredient information, customer-service channels, and a stated return policy is easier to evaluate than an anonymous product sold through an unverified website.
Still, a company’s existence does not establish that every health claim made about a product is clinically proven. When evaluating CircO2, it is useful to separate facts about the product from claims about what the product may accomplish.
What Ingredients Are in CircO2?
The Supplement Facts information lists a 420 mg proprietary nitric oxide blend. This blend contains beetroot powder, hawthorn berry extract, L-citrulline, and sodium nitrite. The formula also provides vitamin C, vitamin B12, and magnesium.
| Ingredient | Listed Amount | General Role |
|---|---|---|
| Vitamin C | 100 mg | Essential vitamin with antioxidant functions |
| Vitamin B12 | 1,000 mcg | Supports normal blood and nervous-system functions |
| Magnesium | 4 mg | Essential mineral involved in numerous body processes |
| Proprietary nitric oxide blend | 420 mg | Contains beetroot, hawthorn, L-citrulline, and sodium nitrite |
One limitation is worth noting. The 420 mg amount applies to the entire proprietary blend, not to each individual ingredient. The label does not tell you exactly how much beetroot, L-citrulline, hawthorn, or sodium nitrite is included.
Does CircO2 Have Legitimate Nitric Oxide Ingredients?
Yes. Several ingredients in CircO2 have been studied in relation to nitric oxide metabolism. Beetroot is naturally rich in dietary nitrate, which can enter the nitrate-nitrite-nitric oxide pathway. L-citrulline is an amino acid that can increase the body’s availability of L-arginine, which is used in nitric oxide production.
Dietary nitrate has received considerable attention in exercise research. Studies have reported improvements in certain exercise-performance measures, although results vary depending on the dose, timing, type of exercise, and individual characteristics.
L-citrulline has also been studied for its effects on nitric oxide-related pathways and vascular function. However, research on an individual ingredient does not automatically prove that a particular commercial formula will produce the same result.
The ingredients give CircO2 a plausible scientific foundation, but they should not be treated as proof that the finished product delivers every benefit claimed in advertisements.
Why Does CircO2 Use a Lozenge?
The delivery format is one of the features that makes CircO2 different from many other nitric oxide supplements. Instead of swallowing a conventional capsule, users allow the tablet to dissolve in the mouth.
The manufacturer’s explanation focuses partly on the role of oral bacteria in nitrate metabolism. Research has established that oral microorganisms participate in the conversion of dietary nitrate to nitrite, making the mouth an important part of the enterosalivary nitrate-nitrite pathway.
That does not necessarily mean a lozenge will always work better than a capsule or powder. The format is simply part of the company’s formulation approach.
Are CircO2’s Benefits Scientifically Proven?
This is where it is important to look beyond marketing language. Nitric oxide itself is a well-established signaling molecule involved in vascular function. Dietary nitrate and L-citrulline have also been studied extensively.
However, there is a difference between evidence for nitric oxide biology, evidence for individual ingredients, and evidence for the complete CircO2 formula.
Independent research directly testing the finished CircO2 product is much more limited than the research available on ingredients such as beetroot and L-citrulline. Therefore, it would be misleading to say that every advertised outcome has been clinically established.
A more evidence-based conclusion is that CircO2 contains researched ingredients, while the strength of evidence for the complete finished formula is less certain.
Can CircO2 Improve Circulation?
Nitric oxide is involved in normal blood-vessel relaxation and vascular signaling, so supporting nitric oxide pathways is biologically relevant to circulation. This is one reason nitric oxide supplements have become popular.
Beetroot and dietary nitrate are particularly interesting because research has found that nitrate can increase nitric oxide-related metabolites. Some studies have also reported improvements in exercise efficiency or performance under specific conditions.
That does not mean CircO2 should be considered a treatment for poor circulation, high blood pressure, heart disease, or another medical condition. A dietary supplement should not replace appropriate medical evaluation or prescribed treatment.
CircO2 Side Effects and Safety
Calling a supplement “100% safe” would be inappropriate. Any supplement can cause unwanted effects or interact with medications, and individual responses can differ.
Because CircO2 contains ingredients that may influence nitric oxide pathways and vascular function, people taking medications that affect blood pressure or circulation should be especially cautious.
The proprietary blend also means that the exact quantities of its individual ingredients are not disclosed. Anyone with a medical condition, anyone taking prescription medication, or anyone unsure whether nitric oxide supplementation is appropriate should speak with a healthcare professional before using CircO2.
Is CircO2 FDA Approved?
No dietary supplement should be described as FDA-approved in the same way that an approved prescription drug is. CircO2 is marketed as a dietary supplement, and the FDA does not pre-approve dietary supplements for effectiveness before they are sold.
The manufacturer’s website includes the standard supplement disclaimer stating that its statements have not been evaluated by the Food and Drug Administration and that the product is not intended to diagnose, cure, or prevent disease.
This is an important distinction when reading online advertisements. FDA regulation of dietary supplements is not the same thing as FDA approval of a supplement’s effectiveness.
How Much Does CircO2 Cost?
CircO2 is sold in different package sizes, and pricing or promotional offers can change over time. The manufacturer’s current product information has listed single-box, three-box, and six-box options.
Rather than relying on an old advertised price, check the current offer before purchasing. Also look at the total price, shipping terms, number of boxes included, and return policy.
The company currently advertises a 90-day satisfaction guarantee. According to its product information, customers who are dissatisfied can return the product within the stated 90-day period for a refund, subject to the company’s return terms.
Where Can You Buy CircO2?
CircO2 is primarily sold online through Advanced Bionutritionals. The company states that the product is not sold through ordinary retail stores and directs customers to its online ordering process.
If you decide to buy it, using the manufacturer’s official sales channel can make it easier to verify that you are purchasing the intended product and to review the current guarantee and ordering terms.
Thinking about trying a nitric oxide supplement? CircO2 combines beetroot, L-citrulline, hawthorn, sodium nitrite, and selected vitamins in a convenient quick-dissolve lozenge.
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Red Flags to Watch for With Any Supplement
Whether you are considering CircO2 or another nitric oxide supplement, there are several warning signs worth watching for. Be cautious of websites promising guaranteed medical results, claiming that a supplement can cure diseases, or insisting that a product has absolutely no risks.
Fake countdown timers, misleading “limited stock” messages, anonymous testimonials, and unrealistic promises can also make a supplement offer less trustworthy.
| More Trustworthy Sign | Potential Red Flag |
|---|---|
| Clear ingredient label | Ingredients are hidden completely |
| Identifiable manufacturer | No clear company information |
| Published return policy | No refund or contact information |
| Evidence-based language | Guaranteed medical results |
| Clear pricing | Unexpected charges at checkout |
So, Is CircO2 Legit or a Scam?
Based on the available information, CircO2 appears to be a legitimate dietary supplement rather than a scam product. It has an identifiable manufacturer, a published Supplement Facts panel, a defined formula, online purchasing information, and a stated satisfaction guarantee.
But “legit” should not be interpreted as “proven to work for everyone.” The evidence supporting the underlying nitric oxide ingredients is more substantial than the evidence specifically testing the complete CircO2 formula.
If you are considering CircO2, the most reasonable approach is to evaluate it as a dietary supplement with potentially useful ingredients rather than expecting guaranteed health results.
Final Thoughts Before You Buy
CircO2 is not an anonymous product with no identifiable company or ingredient information. Its formula includes ingredients that have legitimate scientific interest, particularly beetroot-derived nitrate and L-citrulline.
At the same time, it is worth keeping expectations realistic. The proprietary blend limits dose transparency, and research on individual ingredients should not be presented as direct proof of the finished product’s effectiveness.
If you decide to try CircO2, review the current label and purchasing terms, follow the recommended directions, and consider your own health circumstances. If you take medication or have an existing medical condition, consult a healthcare professional first.
Important Disclaimer
This article is provided for educational purposes only and is not medical advice. CircO2 and other dietary supplements are not intended to diagnose, treat, cure, or prevent disease. Individual results may vary. Consult a qualified healthcare professional before using dietary supplements, particularly if you have a medical condition, take prescription medication, or have concerns about blood pressure or cardiovascular health.
Affiliate Disclosure
We may earn a commission if you purchase CircO2 through links on this website, at no additional cost to you. Our recommendations are intended to provide useful information and help readers make informed purchasing decisions.
