My name is Michael Thompson, and I live in Denver, Colorado. Lately, I’ve found myself catching my breath after climbing a single flight of stairs and feeling drained by midday. Simple tasks like mowing the lawn or playing with my dog leave me winded in a way I don’t remember in my younger years. When I started digging into my symptoms, I came across CircO2 Reviews online, where people my age shared similar struggles with circulation and energy. Curious but cautious, I decided to learn more. This is my honest experience, with no spin or hype behind it.
Over the past few months, I’ve read dozens of CircO2 Reviews to weigh real feedback against marketing claims. I wasn’t looking for a quick fix or magic bullet—just a supplement that might support my body’s natural circulation. After checking ingredient lists, customer experiences, and the 90-day guarantee, I ordered my first box. I began taking one lozenge daily and paid attention to any shifts in my stamina, focus, or joint comfort. Tracking everyday moments like standing up from the couch or going for a short walk helped me see small changes I might have missed otherwise.
Reading CircO2 Reviews gave me a realistic picture of what to expect—some days felt stronger than others, and my progress was gradual. But by staying consistent and noting real-life improvements, like feeling less stiff when I got out of bed or having the energy to finish a project without mid-afternoon lulls, I felt more confident in whether this approach worked for me. If you’re curious about nitric oxide supplements and want honest insights without hype, my journey and the stories behind CircO2 Reviews might be a helpful starting point for your own exploration.
CircO2 Nitric Oxide Booster Overview
| Feature | Details |
|---|---|
| Product Name | CircO2 |
| Manufacturer | Advanced Bionutritionals |
| Purpose | Nitric oxide booster to enhance blood flow and support overall wellness |
| Formulation Type | Quick-dissolving lozenges |
| Primary Benefits | Improves blood circulation, boosts energy, enhances cognitive function, supports heart health |
| Key Ingredients | Hawthorn Berry Extract, Beet Root Powder, L-Citrulline, Vitamin B12, Vitamin C |
| Recommended Dosage | 1-2 lozenges per day |
| Packaging | 30 lozenges per box (1-month supply) |
| Availability | Exclusively available on the official website |
| CircO2 Price | – 1 Box: $49.95 – 3 Boxes: $44.95/box ($134.85 total) – 6 Boxes: $41.50/box ($249 total) |
| Money-Back Guarantee | 90-day risk-free guarantee |
What is CircO2?
Before trying it myself, I spent a good amount of time reading CircO2 Reviews to understand what the supplement actually does. CircO2 is a nitric oxide supplement made by a company called Advanced Bionutritionals. It comes in the form of quick-dissolving lozenges, which I personally found much easier to take compared to pills or powders. The main goal of CircO2 is to support the body’s natural nitric oxide production, which tends to decline as we age.
Nitric oxide plays an important role in maintaining healthy blood flow, which in turn affects energy levels, stamina, and heart health. What drew me to it was how many users in CircO2 Reviews mentioned improvements in daily energy and less fatigue. As someone in my early 50s, those were the exact areas I was hoping to improve. It’s not meant to be a cure-all, but more of a nutritional support to help your body work a little more efficiently as you age.
How Does CircO2 Work?
Reading through CircO2 Reviews and doing my own research helped me understand how CircO2 actually works. It targets something called the endothelium, which is the inner lining of our blood vessels. Over time, this lining becomes less efficient at producing nitric oxide. Without enough nitric oxide, our blood vessels don’t expand as well, which means less oxygen and nutrients get where they need to go.
CircO2 works by supplying your body with nutrients that support and stimulate natural nitric oxide production. The lozenges dissolve in your mouth and are absorbed sublingually (under the tongue), which helps the ingredients get into your bloodstream faster. This delivery method was mentioned in several CircO2 Reviews as one of the reasons why people preferred it over pills.
With better blood flow, I started noticing changes in how I felt during the day—fewer crashes, more steady energy, and just a general sense of feeling more “awake.”
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CircO2 Ingredients Breakdown
One of the things I looked for when reading CircO2 Reviews was how well the ingredients were backed by science. Here are four of the core ingredients and what I found:
- Hawthorn Berry Extract: Used traditionally for heart health. A study in the International Journal of Cardiology found it supports endothelial function and may help improve blood pressure regulation.
- Beetroot Powder: Rich in natural nitrates. According to a study in the journal Nutrients, beetroot supplementation improves blood flow and endurance, especially in older adults.
- L-Citrulline: Converts to L-arginine in the body, which boosts nitric oxide levels. A clinical trial in Experimental Physiology showed that L-citrulline helped improve vascular function in aging individuals.
- Vitamin B12: Essential for energy production and neurological health. Studies in the American Journal of Clinical Nutrition indicate that B12 may help improve endothelial function in those with deficiencies.
These ingredients kept showing up in CircO2 Reviews as being the key to its effectiveness for many people, myself included.
Key Benefits of CircO2
Based on my experience and what I’ve read in CircO2 Reviews, here are some of the main benefits people seem to notice:
- Improved Daily Energy: I no longer needed an afternoon nap or an extra cup of coffee to make it through the day. This was a big one for me.
- Better Circulation: My hands and feet used to feel cold often, but since starting CircO2, that’s changed noticeably.
- Sharper Mental Focus: Several CircO2 Reviews, and my own experience, point to better clarity and less brain fog throughout the day.
- Joint Comfort and Mobility: I didn’t expect this, but the morning stiffness in my knees started easing up after about a month.
- Easier Workouts: While I’m not doing anything extreme, my regular walks and light workouts feel less tiring.
CircO2 doesn’t change everything overnight, but consistent use showed me small, steady improvements that made a difference.
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CircO2 Dosage and Usage Instructions
According to the instructions and confirmed by many CircO2 Reviews, the recommended dosage is one to two lozenges per day. I personally started with one a day in the morning, right after brushing my teeth. You place it under your tongue and let it dissolve slowly—don’t chew it. This helps the nutrients absorb faster into the bloodstream.
Some people prefer to take the second lozenge in the afternoon if they feel their energy dips, but for me, one lozenge was enough to start noticing a difference. It’s important to give it time—CircO2 Reviews often mention that the benefits become more noticeable after 2–3 weeks of consistent use.
Also, it’s best not to eat or drink anything for about 10 minutes after letting the lozenge dissolve. This gives the ingredients time to absorb fully. Sticking to a routine really helped me stay consistent and get the most out of the product.
Pros and Cons of CircO2
Pros
- Easy to Take: The dissolving lozenges are convenient and better than swallowing multiple pills.
- Backed by Research: Ingredients have clinical studies supporting their benefits.
- Positive User Feedback: CircO2 Reviews show many satisfied users, especially over 50.
- Good for Circulation: I personally noticed improved blood flow and reduced cold extremities.
- Money-Back Guarantee: The 90-day risk-free trial gave me confidence to try it.
Cons
- Only Available Online: You can’t buy it in stores, which isn’t ideal for everyone.
- Price May Be a Concern: It’s not the cheapest supplement out there.
- Results Vary: Not everyone has the same experience; some users saw slower progress.
- Some Digestive Issues: A few CircO2 Reviews mentioned mild stomach upset early on.
Overall, the pros outweighed the cons for me, but it’s important to set realistic expectations.
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Side Effects of CircO2
One of the first things I checked in CircO2 Reviews was whether people experienced side effects. For me, I didn’t have any major issues, but it’s good to know what to expect. The most common side effect reported by users, including a few I found in CircO2 Reviews. There is mild digestive discomfort. I had some slight bloating during the first few days, but it went away quickly.
Since CircO2 uses natural ingredients and avoids stimulants, it’s generally well-tolerated. That said, if you’re taking medications, especially for blood pressure or heart conditions, it’s a good idea to talk to your doctor first. The lozenge format also makes it easier on the stomach than capsules or powders.
Pregnant or nursing women and people with underlying health conditions should be cautious. The good news is that serious side effects are very rare based on the CircO2 Reviews I’ve seen. Most people experience no issues at all when taken as directed.
CircO2 Reviews: Real Customer Feedback
When I was looking into this supplement, I found CircO2 Reviews from people across the U.S. sharing their experiences. Here are a few that stood out:
- Susan M., Austin, TX: “After about three weeks, I started feeling a steady boost in my energy. My morning walks felt easier, and I wasn’t crashing in the afternoon like I used to.”
- James R., Minneapolis, MN: “It’s not a miracle pill, but I do feel more alert and my hands don’t get cold anymore. That’s a win in my book.”
- Lisa K., Raleigh, NC: “I noticed a small improvement in stamina, but not as much as I hoped. I’ll keep using it another month and see.”
- George T., San Jose, CA: “The lozenges are convenient. I’ve reordered twice now. Energy levels and focus have definitely improved.”
These CircO2 Reviews helped shape my expectations and made me feel more confident in giving it a try.
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Is CircO2 a Scam?
It’s understandable to be cautious when trying a new supplement—especially online. I saw a few questions in forums about whether CircO2 is a scam, so I took a deeper look. Based on my experience and the large number of detailed CircO2 Reviews, I don’t believe it’s a scam.
CircO2 is made by Advanced Bionutritionals, a well-known supplement company that’s been around for years. They provide a transparent list of ingredients, follow GMP manufacturing standards, and offer a 90-day money-back guarantee. Scam products typically don’t back their product like that.
That said, I recommend avoiding third-party sellers or unknown websites claiming to sell it at a big discount. Some CircO2 Reviews mention fake or expired products from unauthorized sources. Buying directly from the official site is your safest option for getting the real deal.
Where to Buy CircO2?
If you’re thinking about trying it, I strongly suggest buying CircO2 only from the official Advanced Bionutritionals website. That’s what I did after reading several CircO2 Reviews that warned against third-party sites. Ordering directly guarantees the product is authentic, fresh, and comes with the full 90-day money-back policy.
I didn’t find it available on Amazon, Walmart, or any physical health stores. CircO2 Reviews have pointed out that buying from unofficial sellers can be risky due to expired or fake products. So while it’s a bit inconvenient not to grab it in stores, the extra peace of mind is worth it.
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CircO2 Pricing and Availability
Here are the current pricing packages available on the official website:
- 1 Box (30 Lozenges) – $49.95 (plus free shipping)
- 3 Boxes – $44.95 per box ($134.85 total, free shipping)
- 6 Boxes – $41.50 per box ($249 total, free shipping)
Most CircO2 Reviews recommend the 3- or 6-box package because consistent use is key to seeing results.
CircO2 Bonuses and Money Back Guarantee
When you order from the official site, you get a 90-day money-back guarantee, which is one reason I felt comfortable trying CircO2 in the first place. If you don’t see improvements in that time, you can send it back for a full refund—no questions asked.
They also sometimes offer free eBooks or health tips with larger orders, so check their official site for current bonuses. CircO2 Reviews often mention these extras as a nice bonus for long-term users.
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Final Verdict on CircO2 Reviews
Based on my experience and reading through dozens of CircO2 Reviews, I believe it’s a legitimate option for people over 40 or 50 who are noticing slower energy, reduced stamina, or cold hands and feet. It’s not a cure, and results may vary, but for me, the gradual improvements were enough to make a real difference in my day-to-day routine.
I appreciated the ease of the lozenge format, the transparent ingredient list, and the lack of artificial additives. CircO2 helped me feel more like myself again—not in a dramatic way, but in those small everyday wins that add up. From what I’ve read, most users who stick with it for a couple of months tend to report the best results.
If you’re considering nitric oxide supplements and want real user insight without exaggerated claims, CircO2 Reviews like mine can help guide your decision.
CircO2 FAQ
Most users, including myself, start to notice improvements within 2–4 weeks of daily use.
Yes, it’s made with natural ingredients and is generally safe for healthy adults, but check with your doctor if you’re on medication.
Many users do, but it’s best to consult your healthcare provider if you’re on multiple supplements or medications.
Yes, the product contains no animal-based ingredients and is suitable for vegetarians.
You’re covered by a 90-day money-back guarantee, so you can return it for a refund if you’re not satisfied.
