From the same manufacturer that makes SuperBeets, SuperBeet Soft Chews, BeetElite, and Neo40. Once opened we recommend using within 6 months. Noninvasive as the results are instant and easy to read. Our nitric oxide indicator strips can give you an indication of whether your diet is lacking and if your body is NO deficient. Nitric oxide indicator strips are a simple way to see if you are getting enough essential dietary nitrate from your diet.