CircO2 Review: Can a Dissolving Lozenge Really Support Your Circulation?
CircO2 is Advanced Bionutritionals’ nitric oxide lozenge — beet root, L-citrulline, hawthorn, and vitamins C & B12 in a tablet that dissolves in your mouth instead of your stomach. We looked at the science behind the delivery method, where the marketing gets ahead of the evidence, and the unusually generous refund policy.
Check Today’s Price on the Official Site → $49.95 single box · Multi-box packages lower the per-box price
What Is CircO2?
CircO2 is a nitric oxide support supplement from Advanced Bionutritionals — the same established, GMP-certified US company behind Advanced Amino Formula, with a large base of public customer reviews. Nitric oxide is a signaling molecule your blood vessels use to relax and widen; the body’s production of it naturally declines with age, which is the gap this product aims to help fill.
Two things genuinely distinguish it. First, the ingredient logic is sound: beet root powder supplies dietary nitrates and L-citrulline feeds the body’s own nitric-oxide pathway — both are among the most-studied natural approaches to NO support. Second, the lozenge format: it dissolves in the mouth rather than the stomach, a delivery route with real precedent in pharmaceutical practice. You take one lozenge daily; a box of 30 is a one-month supply.
Reality Check — Read Before Buying
On the numbers: the marketing cites figures like a 200% nitric-oxide rise within 20 minutes and talks of feeling “superhuman” at 70. These are the company’s own claims, not independently published trial results for this product. The ingredients are legitimately studied; the specific percentages are advertising. Some buyers also report no measurable change on the included saliva test strips — responses genuinely vary.
On safety: this matters more than usual here. Because nitric oxide affects blood vessel dilation, talk to your doctor before taking CircO2 if you use blood pressure medication, nitrate drugs (like nitroglycerin), or ED medications — combining vessel-dilating substances is a real interaction question, not fine print. This product supports normal function; it does not treat high blood pressure or any condition.
How the Formula Is Meant to Work
Dissolve, don’t swallow
The lozenge melts in your mouth, where conversion of dietary nitrates begins — bypassing digestive breakdown.
Two NO pathways
Beet root supplies natural nitrates while L-citrulline feeds the body’s arginine-to-NO enzyme pathway.
Supporting nutrients
Vitamin C and hawthorn berry provide antioxidant support; B12 contributes to normal energy metabolism.
Consistency over weeks
Users who benefit typically report changes over 4–8 weeks of daily use — this is not an instant effect.
Pros & Cons — The Honest Version
What works
- Established company with named formulators and GMP manufacturing
- Beet nitrates and L-citrulline are genuinely well-studied NO ingredients
- Lozenge delivery has real precedent and suits people who dislike pills
- 90-day guarantee covers the product even after you’ve used it all
- Vegan, non-GMO, and free of gluten, soy, and dairy
What to watch
- Headline figures (200% boost, “superhuman”) aren’t independently verified
- Premium recurring cost — $49.95/month adds up for long-term use
- Some users report no measurable change on the test strips
- Interaction questions for anyone on BP, nitrate, or ED medications
- Results build over weeks and vary widely between individuals
Who Should (and Shouldn’t) Buy It
Worth trying if you…
- Are an older adult interested in supporting healthy circulation and energy
- Prefer a dissolving tablet over pills, powders, or beet juice
- Can commit to daily use for 4–8 weeks before judging it
- Value a guarantee that lets you finish the box and still refund
Skip it if you…
- Take blood pressure, nitrate, or ED medication — until your doctor approves
- Expect a treatment for any diagnosed condition
- Want a budget option — plain beet root or citrulline costs less
- Need instant, guaranteed results — no supplement offers that
“Down to the Last Lozenge” — 90 Days
Advanced Bionutritionals’ guarantee lets you use the entire box, decide it didn’t work for you, and still return it within 90 days for a full refund including original shipping — you pay only return shipping. That’s rare in the supplement industry and long enough to properly judge a slow-building formula. Buy from the official site; third-party purchases may not be covered.
Frequently Asked Questions
Is CircO2 legit or a scam?
Will it lower my blood pressure?
How do I take it, and when will I notice anything?
What does it cost?
How does the refund work?
Are there side effects?
Bottom Line: Sound Ingredients, Softened Expectations
CircO2 pairs genuinely well-studied nitric-oxide ingredients with a clever delivery format and the strongest guarantee in its category. Ignore the “superhuman” framing, clear it with your doctor if you take heart or blood pressure medication, give it a consistent month or two — and let the use-it-all 90-day refund carry the risk.
Visit the Official CircO2 Site → 90-day money-back guarantee · Down to the last lozenge