Nitric Oxide Levels Jump 200% Higher In Just 20 Minutes
Boosts your energy… sharpens memory… increases stamina…enhances sexual performance…and helps lower blood pressure
Review Stars
Why You Need Nitric Oxide
Nitric oxide is the “youth molecule” your body uses to keep your blood vessels open, oxygen flowing, and brain firing.
But research shows that by age 70 your nitric oxide levels drop by a whopping 75%. By 80, nitric oxide levels are down by 85%.
This dramatic decline is the hidden cause behind:
Fatigue that keeps you from activities you love
Blood pressure concerns your doctor keeps monitoring
“Senior moments” and frustrating memory lapses
Reduced intimacy and performance in the bedroom
Joint discomfort that limits your independence
Cold hands and feet from poor circulation
When nitric oxide plummets, you don’t just feel older – your body literally starves for oxygen and nutrients.
The good news? CircO2 fixes your nitric oxide problems in 20 minutes. So you can reverse your symptoms fast.
Why Most “Nitric Oxide” Supplements Fail
The most common ways people try to boost their nitric oxide levels don’t work. Here’s why:
L-arginine supplements
Clinical studies show L-arginine loses up to 75% of its potency during digestion. What’s more, after age 45, your body struggles to convert L-arginine to nitric oxide at all.
Beet juice and leafy greens
While effective, you’d need 2-3 pounds of these foods daily for therapeutic effects. Plus, their nitric oxide-boosting power varies, depending on the soil these plants grew.
Standard pills and capsules
These go straight to your stomach. But MIT scientists found that the first and most crucial step in nitric oxide production does NOT happen in your gut.
Nitric Oxide Levels Chart
The MIT Breakthrough
That Changes Everything
Nitric Oxide Levels Chart
MIT scientists discovered that nitric oxide production starts in your mouth. It’s the bacteria on your tongue that convert nitrates into nitric oxide. That’s the first and most important step.
That’s why CircO2 comes in fast-dissolving lozenges. You place one on your tongue, and within minutes it kickstarts nitric oxide production.
In clinical testing, this method raised nitric oxide levels 200% within 20 minutes. And it increased blood flow by a staggering 34%.
No pill or capsule can achieve these results.
3 Energy-Enhancing Nutrients
#1 Beet Root Powder – Olympic-Level Stamina & Power
Beet root is a favorite of Olympic athletes – and for good reason. It’s rich in natural nitrates that help open up blood vessels, improve oxygen flow, and supercharge your stamina.
Beet Root Powder
#2 Hawthorn Berry – The Absorption Booster
Used for centuries to support the heart, hawthorn berry is now known to enhance nitric oxide absorption. So it helps your body get more nitric oxide out of every dose.
Hawthorn Berry
#3 L-Citrulline – Superior to L-Arginine
L-citrulline converts to nitric oxide more effectively than L-arginine, especially if you’re over 45. It supports circulation, blood pressure, memory, and sexual performance.
L-Citrulline
More Nutrients That Multiply the Benefits
CircO2 also includes more ingredients that enhance nitric oxide production:
Vitamin B12
Vitamin B12
After 50, up to 30% of adults become B12 deficient. The B12 in CircO2 boosts energy, nerve health, and nitric oxide production.
Vitamin C
Vitamin C
Acts as a catalyst for nitric oxide production and protects existing nitric oxide from oxidative damage.
Magnesium
Magnesium
Relaxes blood vessels, regulates heart rhythm, and supports recovery.
Together, these ingredients create the most complete, scientifically-advanced nitric oxide restoration system available.
How CircO2 Will Transform
Your Daily Life
People who take CircO2 report the below benefits:
✔ Renewed energy and stamina to stay active, travel, or pursue passions without afternoon fatigue
✔ Sharper thinking and recall – remember names, where you put things, and maintain your mental edge in conversations
✔ Healthier blood pressure readings that will impress your doctor
✔ Enhanced mobility and comfort as your joints receive more oxygen and nutrients
CircO2
✔ Improved intimacy and performance through better blood flow to all areas of the body
✔ More restful sleep and waking refreshed, not groggy
✔ A sense of youth and vitality as your brain and body receive optimal oxygen and nutrients
About Dr. Greg Eckel
About Dr. Greg Eckel
Dr. Eckel is a Naturopathic Physician with more than 23 years of experience in Integrative and Regenerative Medicine.
He is the founder of Energy4Life Centers, where he practices his unique combination of naturopathy, Chinese Medicine, and cutting-edge technologies. He has a track record of success with difficult cases, and patients fly in from all over the world to see him.
He has been featured on major networks such as ABC, NBC, and FOX, and is the author of the book “Shake it Off: An Integrative Approach.”
Dr. Eckel has served as the President of the Board of Naturopathic Medical Examiners.
Customer Testimonials
Try CircO2 Risk-Free with Our 90-Day Guarantee
We’re so confident CircO2 will transform how you feel, we offer a “Down to the Last Lozenge” guarantee.
If you’re not completely satisfied for any reason, simply return the box – even if it’s empty – within 90 days for a complete refund.
Choose the number of boxes you will order today. It’s entirely up to you, but we suggest you order at least 3 boxes. You’ll save $15. And we’ll cover the cost of shipping, too!
Since you can try CircO2 for almost 90 days, 100% RISK FREE, you have absolutely nothing to lose … and everything to gain!
Plus, once you feel the CircO2 difference, you’ll understand why people don’t ever want to run out.
CircO2 Guarantee
Still Undecided?
Here are some of the top questions people have about CircO2…
Is CircO2 safe?
How long will it take for me to know it’s working?
I already have tons of energy and my blood pressure is fine. How can CircO2 help me?
I read that using antiseptic mouth wash and fluoride toothpaste stops my body from making nitric oxide. Should I stop using them?
Do I need to take it twice a day?
Do I have to let the lozenge dissolve completely in my mouth?
Caffeine and energy drinks give me the shakes. Will that happen if I take CircO2?
Where can I get CircO2?
Try CircO2
Risk-Free and Save
Sample Option
1 Box
CircO2 One box
$49.95 /Box
Total: $49.95
Credit Card Icons
Biggest Savings
6 Boxes
CircO2 Six Boxes
$41.50 /Box
Money Icon Instant Savings: $50.70
Free Shipping Included Free Shipping
Total: $249.00
Credit Card Icons
Most Popular
3 Boxes
CircO2 Three Boxes
$44.95/Box
Money Icon Instant Savings: $15.00
Free Shipping Included Free Shipping
Total: $134.85
Credit Card Icons
Advanced Bionutritionals Guarantee
Every purchase is protected by our ABN™ 100% Satisfaction Guarantee. If you are unsatisfied for any reason, return it within 90 days for a full refund. You only pay return shipping.
CircO2 Reviews
1590 Reviews | 3.8 Average Rating | 74% Recommend This Supplement
Jake L.
Canada
December 2, 2025
Nitro oxide *
Gives the energy that one looses thorough out the day
I Recommend This Supplement Verified Customer
San Gabriel Q.
Bridgewater, NJ
November 28, 2025
I like and recommend this supplement *
CircO2 is my favorite supplement for my blood pressure. I used this supplement for many years now and I usually stock up for 5-7 months. I used this in place of my regular prescription drugs which I stop for several years now. I will continue using this supplement since it keeps my blood pressure in normal range.
I Recommend This Supplement Verified Customer
Linda S.
Sanford, NC
November 26, 2025
Very satisfied *
I take this every other day and can honestly say they are great for helping me regulate my BP.
I Recommend This Supplement Verified Customer
Paul W.
Humble, TX
November 14, 2025
Pain reduced with CircO2 *
Before I started taking CircO2 in 2023 I was having trouble sleeping at night because of pain in my hands and arms. After taking CircO2 my pain was reduced and now I can sleep with almost no pain.
I Recommend This Supplement Verified Customer
Gary W.
November 11, 2025
Shared with Many *
I’ve used circO2 with great results, so much so, I ordered about 20 boxes. I delivered them to my sponsored family in Tacloban Philippines.
I Recommend This Supplement Verified Customer
Yu Hsin Chang C.
November 4, 2025
My parents love this product *
my parents are both over 70 and they are both satisfied with this product, and always ask me to purchase it!
I Recommend This Supplement Verified Customer
* Above are actual reviews from our customers. These customer’s statements may not reflect the typical purchaser’s experience and are not intended to represent or guarantee that anyone will achieve the same or similar results. The reviews should not be taken as the results a typical user will get. Your results may vary.
Disclaimers
Dr. Greg Eckel is compensated by Advanced Bionutritionals for his work in endorsing this product.
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, cure, or prevent a disease.