These strips appeared to be an excellent price, but we purchased them in the summer and I don't know if they were affected by the heat in shipping or the quality is just bad. My daughter and I both tried them but they did not work (no change in color whatsoever). We had purchased two bottles and tried both bottles. We went out and bought a bottle at the local pharmacy and they worked fine. We were really disappointed at having wasted the money.
Don't waste your money. These are junk. They are totally inaccurate and become inactive within a month or so after opening. I bought 3 and I'm stuck with a bunch of useless, discolored strips. Sounds like some very poor quality control or some really biased reviews. Again, DO NOT BUY THESE. Save your money for another brand.
These are totally useless - in fact netrition should quit carrying them. I was paying $29.00 for 100 Ketostix from Bayer and found that about 10 out of 100 were faulty (not changing color at all). I have gone through 50 of the LW strips and only 4 registered color change at all.
DO NOT BUY!
I bought a package when I first started low-carbing, and they hardly ever changed color. Eventually I stopped using them and the expiration date passed.
I bought another package due to curiosity, and the low price. Again, they hardly changed color.
I noticed that my grocery store had Ketostix on sale at the pharmacy. These were Bayer brand. I noticed right away that the unused strip had a light tan color, whereas the LW Scientific brand was greyish.
The Bayer brand is much more reactive and, I believe, accurate. I tested both brands simultaneously over several days. Even when I was getting a deep purple from the Bayer sticks, the LW Scientific strips remained grey. Or, there might be a hint of purple within the layers of the test paper, but not on the surface.
I had similar experiences to the others who posted reviews here. In a side by side comparison using the same test sample the Bayer strips worked perfectly, the LW strips were discolored right out of the package and never changed color. I was excited about the cheaper price at first but very disappointed in the results, you really do get what you pay for... and from now I'm paying a little more for the strips at my local pharmacy. I prefer to order all of my supplements and diet aids from Netrition, I really wish they'd start carrying another brand of testing strips.
I have to agree with others, this product just does not work. I have tested them against other strips...these do not change color at all...while at the same time, my other strips light up like a purple Christmas tree. Don't waste your money...these will make you feel like you are doing something wrong, when you may not be!