CircO2 supplement by Advanced Bionutritionals is effective and works as advertised and I recommend it anyone seeking to improve their overall health and wellbeing. The proof that it works is in the test strips. I purchased it for my wife for occasional numbness/cramps/pain in her legs. The test strips to our surprise showed she had Zero NO2 while mine level is at mid-range. After taking the supplement for 14 days she/we tested again with the strips and to our delight the color shows mid-level color, the legs pains/cramps has decreased, an indication that the Supplement works or is working for her.
We plan to order another shipment soon and will continue to use it.
My wife and I were very skeptical at first but the assurance of using or testing first with the strips before taking it, .... it is that simple, Test before you use it!!