How to test
By around 40, most adults make roughly half the nitric oxide they did at 20. Nitric oxide supports circulation, blood pressure, stamina and recovery.
Rocket, spinach, beetroot
Leafy greens and beetroot are rich in dietary nitrates. The free Nitric Oxide Kitchen guide has 7 days of recipes.
Nasal breathing
Humming and nasal breathing release nitric oxide in the sinuses. Try the free daily practice on our site.
Support both pathways
L-citrulline plus beetroot and arugula nitrates, protected by antioxidants. Retest in two to four weeks.
Learn about Ultimate 4 →Overall rating: 4.7 / 5 from 12 reviews.
A useful way to have a visual tangible way to track your wellness progress over time, rather than just relying on how you feel day to day. The new individually wrapped packaging of the test strips, has also kept them from oxidation. Another great product. Thx Jeff🙂
My first time using, the colour did not register on the stick. After 4 weeks using, it registered on the lightest colour. Easy to use test strips.
I have been taking boost3 and ultimate4 My level has increased after about 3 weeks i think. Energy is great. Activity levels back up . Its great to be able to test the Nitrix Oxide that's circulating and adjust accordingly.
so good to see progress in action!
It is great to be able to have proof of how this supplement is working along with certainly having more energy.
great to see improvements
Love that it's so easy to track progress
Very easy to use, and wait with anticipation each week to see how my levels have improved.
Great to be able to see progress!
If I test within 4 hours after my mixtures, I reach target. Next morning, barely pale pink so not consistent. But my tendinopathy has improved so now barely any pain. And sleeping on my side. And no arthritic pain in my hands. These are the reasons I started taking the products. No weight loss other than a kilo. So big improvement in the pain area which alone is enough to keep going
strips work well.
Easy way to check your level. Great idea.
Not sure where to start?
Jeff's free assessment takes about five minutes and shows which foundation to work on first.
Clear, honest answers. Still unsure? Take the free assessment and join the community.
They give a practical snapshot of salivary nitrite, a marker of nitric oxide status. Testing at the same time each morning gives the most consistent picture.
It suggests your nitric oxide status could be better supported through diet, lifestyle or supplementation. It's not a diagnosis.
See the pack details above. Most people test two to three times a week when they start.
Orders are dispatched the next business day. Most arrive within 3 to 7 business days, and you'll get a tracking link by email.
Once you've ordered, log in to your account to read The Butterworth Protocols as a flipbook or download the PDF. The Nitric Oxide Kitchen eating guide is emailed to you.