I have been on Atkin's for 19 months. I purchased one bottle of the ketostix, used about 15 out of 50 and threw them out.

They are frustrating at best.

Better way to tell if you are in ketosis is how do you feel? BTW...are you taking any supplement/vitamin that turns your urine a different color? If so guess what? That kills the strip. Better to use your vitamins/supplement than those strips.